Bulletins


BulletinBulletin dateReplacement BulletinItem no.SummaryAdded
SERVICE BRAKES, AIR - ANTILOCK - ABS WARNING LIGHT
374312/13/20073743A10023472Various abs dtc's and intermittent concerns. *nj12/13/2007
SERVICE BRAKES, AIR - DISC - ROTOR
07052300308/01/200710022957Pulsation/vibration when applying brakes (repair rotor variation and install new front brake shields) *nj10/09/2007

Consumer Complaints


Fail datemilesoccurencesPurchase date
SERVICE BRAKES, ELECTRIC
09/10/201037000
 1. normal driving, surface streets, urban/suburban area. no crash or injury at this time. 2. anti-lock brake system failed, warning light displayed, brakes still functional, noticeable difference in handling and brake performance during regular street-level driving. 3. advised by chevy dealership 'electronic brake control module' (ebcm) malfunctioned/broke, resulting in loss of abs function. dealership recommends replacement.
09/10/201037000
 1. normal driving, surface streets, urban/suburban area. no crash or injury at this time. 2. anti-lock brake system failed, warning light displayed, brakes still functional, noticeable difference in handling and brake performance during regular street-level driving. 3. advised by chevy dealership 'electronic brake control module' (ebcm) malfunctioned/broke, resulting in loss of abs function. dealership recommends replacement.
09/10/201037000
 1. normal driving, surface streets, urban/suburban area. no crash or injury at this time. 2. anti-lock brake system failed, warning light displayed, brakes still functional, noticeable difference in handling and brake performance during regular street-level driving. 3. advised by chevy dealership 'electronic brake control module' (ebcm) malfunctioned/broke, resulting in loss of abs function. dealership recommends replacement.
08/21/2009400001
 Service abs light stays on.we have had the van in for service now over seven times for this problem,the last one being today...08/21/2009. it still is not fixed. it occurs when we have three people in the van with the third sitting behind the driver. numerous sensors, hubs, and wiring harness' have been replaced but the problem is not fixed. *tr
05/12/2009213601
 Abs light came on and i took the vehicle to my mechanic because the warranty expired 2 months ago. the sensor had failed causing my abs light to come on. i had to replace the left front wheel assembly just to fix the sensor. it cost me $250.00 for the part and 120.00 for labor. i called the dealer and was told that if it were under warranty it would have been covered. i contacted gm directly and tried to plea my case for a refund or a partial refund and was told that because i went to my own mechanic there was nothing they would do.. my vehicle is only 3 years old and has only 21,400 miles. the mechanic said he had trouble getting the part because the vehicle is only 3 years old and this usually doesn't happen. *tr
04/15/2006131
 I have a 2006 chevy uplander lt and i started to have problems around 3,000 miles of ownership. it started with electrical issues (hard drive entertainment system, gas gauge, dimming lights, radio losing settings, hard starts, service abs, and service traction control) and gradually moved to mechanical issues (clucking noises ? front end, vibrations ? front end, steering binding, and grinding noises from the front end). what has been replaced in hopes of fixing the issues are the hard drive to the entertainment system, main computer module (twice and reprogrammed several times), steering column, steering box, rack and pinion, front stabilizing control arms, front brake, front rotors resurfaced, abs control module (never fixed the service abs and service traction control). the dealer still can?t explain the grinding noise and is trying to convince me that it is normal characteristics of the van (they actually wrote that in the service report). they can not resolve the service abs and traction control errors. they can?t resolve the hard starts. the dealer has taken a position that no more diagnostic work will be performed to the front end until i replace a cupped tire (their opinion). i have hired a lemon law attorney to help with my problem. *tr
SERVICE BRAKES, HYDRAULIC
02/08/201261000
 Tl- the contact owns a 2006 chevrolet uplander.the contact stated that while driving 5 mph the vehicle exhibited an abnormal sound from the front end. the contact took the vehicle to a dealer. the dealer diagnosed the failure as a fractured tie rod. the contact also stated that the rear brakes would malfunction at low speeds, increasing the stopping distance. the dealer repaired the front suspension and the rear brakes. the failure and current mileage was 61,000. kmj
02/08/201261000
 Tl- the contact owns a 2006 chevrolet uplander.the contact stated that while driving 5 mph the vehicle exhibited an abnormal sound from the front end. the contact took the vehicle to a dealer. the dealer diagnosed the failure as a fractured tie rod. the contact also stated that the rear brakes would malfunction at low speeds, increasing the stopping distance. the dealer repaired the front suspension and the rear brakes. the failure and current mileage was 61,000. kmj
02/08/20126100
 Tl-the contact owns a 2006 chevrolet uplander.the contact stated that while driving 5 mph the vehicle was making sound from the front end.the contact took the vehicle to a dealer. the dealer diagnose the as having a broken tie rod. the contact also stated that the back brakes of the vehicle malfunction at low miles increasing the stopping distance .the dealer repaired the front suspension and rear brakes. the miles current 61,000.jp
02/08/20126100
 Tl-the contact owns a 2006 chevrolet uplander.the contact stated that while driving 5 mph the vehicle was making sound from the front end.the contact took the vehicle to a dealer. the dealer diagnose the as having a broken tie rod. the contact also stated that the back brakes of the vehicle malfunction at low miles increasing the stopping distance .the dealer repaired the front suspension and rear brakes. the miles current 61,000.jp
02/08/20126100
 Tl-the contact owns a 2006 chevrolet uplander.the contact stated that while driving 5 mph the vehicle was making sound from the front end.the contact took the vehicle to a dealer. the dealer diagnose the as having a broken tie rod. the contact also stated that the back brakes of the vehicle malfunction at low miles increasing the stopping distance .the dealer repaired the front suspension and rear brakes. the miles current 61,000.jp
03/15/2010
 1st the check engine light keeps coming on and when put on diagnostic code came back po463. the van wouldn't pass emissions and when you fill up with has it would say it was empty. there's a loud popping noise sounds like at axle. it does this after you stop at red lights. i was told this had to do with axle and could break and cause fatal accident, the abs light keeps coming on and the braking system scared me to death. the doors constantly chime or ding and the doors will open going down the road. i was so upset because i have to transport my elderly aunt and and two children and before i was about to pay to have all this fixed i decided to check out recall. i am so shocked that you can look this up online and they are 1000 documented complaints on all the same problems but yet no recalls. is it gonna take people getting killed to do this. im praying for something less tragic and trying to save these precious lives. there is research and lawsuits that the chevrolet uplanders have alot of these problems from 2005 to 2008 especially with the doors and like me everyone gets annoyed and unplugs them and have to use them manually but why should we when are still paying for automatic doors. this van is truly unsafe and a lemon. i pray to god everyday to keep me safe while driving and have told my husband if i die while driving this vehicle he should sue!!!
03/15/2010
 1st the check engine light keeps coming on and when put on diagnostic code came back po463. the van wouldn't pass emissions and when you fill up with has it would say it was empty. there's a loud popping noise sounds like at axle. it does this after you stop at red lights. i was told this had to do with axle and could break and cause fatal accident, the abs light keeps coming on and the braking system scared me to death. the doors constantly chime or ding and the doors will open going down the road. i was so upset because i have to transport my elderly aunt and and two children and before i was about to pay to have all this fixed i decided to check out recall. i am so shocked that you can look this up online and they are 1000 documented complaints on all the same problems but yet no recalls. is it gonna take people getting killed to do this. im praying for something less tragic and trying to save these precious lives. there is research and lawsuits that the chevrolet uplanders have alot of these problems from 2005 to 2008 especially with the doors and like me everyone gets annoyed and unplugs them and have to use them manually but why should we when are still paying for automatic doors. this van is truly unsafe and a lemon. i pray to god everyday to keep me safe while driving and have told my husband if i die while driving this vehicle he should sue!!!
03/15/2010
 1st the check engine light keeps coming on and when put on diagnostic code came back po463. the van wouldn't pass emissions and when you fill up with has it would say it was empty. there's a loud popping noise sounds like at axle. it does this after you stop at red lights. i was told this had to do with axle and could break and cause fatal accident, the abs light keeps coming on and the braking system scared me to death. the doors constantly chime or ding and the doors will open going down the road. i was so upset because i have to transport my elderly aunt and and two children and before i was about to pay to have all this fixed i decided to check out recall. i am so shocked that you can look this up online and they are 1000 documented complaints on all the same problems but yet no recalls. is it gonna take people getting killed to do this. im praying for something less tragic and trying to save these precious lives. there is research and lawsuits that the chevrolet uplanders have alot of these problems from 2005 to 2008 especially with the doors and like me everyone gets annoyed and unplugs them and have to use them manually but why should we when are still paying for automatic doors. this van is truly unsafe and a lemon. i pray to god everyday to keep me safe while driving and have told my husband if i die while driving this vehicle he should sue!!!
03/15/2010
 1st the check engine light keeps coming on and when put on diagnostic code came back po463. the van wouldn't pass emissions and when you fill up with has it would say it was empty. there's a loud popping noise sounds like at axle. it does this after you stop at red lights. i was told this had to do with axle and could break and cause fatal accident, the abs light keeps coming on and the braking system scared me to death. the doors constantly chime or ding and the doors will open going down the road. i was so upset because i have to transport my elderly aunt and and two children and before i was about to pay to have all this fixed i decided to check out recall. i am so shocked that you can look this up online and they are 1000 documented complaints on all the same problems but yet no recalls. is it gonna take people getting killed to do this. im praying for something less tragic and trying to save these precious lives. there is research and lawsuits that the chevrolet uplanders have alot of these problems from 2005 to 2008 especially with the doors and like me everyone gets annoyed and unplugs them and have to use them manually but why should we when are still paying for automatic doors. this van is truly unsafe and a lemon. i pray to god everyday to keep me safe while driving and have told my husband if i die while driving this vehicle he should sue!!!
03/15/2010
 1st the check engine light keeps coming on and when put on diagnostic code came back po463. the van wouldn't pass emissions and when you fill up with has it would say it was empty. there's a loud popping noise sounds like at axle. it does this after you stop at red lights. i was told this had to do with axle and could break and cause fatal accident, the abs light keeps coming on and the braking system scared me to death. the doors constantly chime or ding and the doors will open going down the road. i was so upset because i have to transport my elderly aunt and and two children and before i was about to pay to have all this fixed i decided to check out recall. i am so shocked that you can look this up online and they are 1000 documented complaints on all the same problems but yet no recalls. is it gonna take people getting killed to do this. im praying for something less tragic and trying to save these precious lives. there is research and lawsuits that the chevrolet uplanders have alot of these problems from 2005 to 2008 especially with the doors and like me everyone gets annoyed and unplugs them and have to use them manually but why should we when are still paying for automatic doors. this van is truly unsafe and a lemon. i pray to god everyday to keep me safe while driving and have told my husband if i die while driving this vehicle he should sue!!!
11/29/200614873
 Tl* the contact owns a 2006 chevrolet uplander. while driving approximately 5 mph on normal road conditions, the anti-lock braking system began to fully engage for a brief moment unexpectedly. the contact stated that the traction control, abs and vehicle stability control warning indicators would illuminate intermittently. in addition, the driver and passenger automatic sliding door would not operate properly. the vehicle was taken to an authorized dealer numerous times for the failures where the sliding doors, steering shaft, yaw sensor, sir module and hub bearings were replaced yet all except the sliding door failure recurred. most recently, the contact stated that when driving the automatic sliding door chime would activate continuously. the vehicle was not further repaired. the failure mileage was 14,873.
11/29/200614873
 Tl* the contact owns a 2006 chevrolet uplander. while driving approximately 5 mph on normal road conditions, the anti-lock braking system began to fully engage for a brief moment unexpectedly. the contact stated that the traction control, abs and vehicle stability control warning indicators would illuminate intermittently. in addition, the driver and passenger automatic sliding door would not operate properly. the vehicle was taken to an authorized dealer numerous times for the failures where the sliding doors, steering shaft, yaw sensor, sir module and hub bearings were replaced yet all except the sliding door failure recurred. most recently, the contact stated that when driving the automatic sliding door chime would activate continuously. the vehicle was not further repaired. the failure mileage was 14,873.
11/29/200614873
 Tl* the contact owns a 2006 chevrolet uplander. while driving approximately 5 mph on normal road conditions, the anti-lock braking system began to fully engage for a brief moment unexpectedly. the contact stated that the traction control, abs and vehicle stability control warning indicators would illuminate intermittently. in addition, the driver and passenger automatic sliding door would not operate properly. the vehicle was taken to an authorized dealer numerous times for the failures where the sliding doors, steering shaft, yaw sensor, sir module and hub bearings were replaced yet all except the sliding door failure recurred. most recently, the contact stated that when driving the automatic sliding door chime would activate continuously. the vehicle was not further repaired. the failure mileage was 14,873.
11/29/200614873
 Tl* the contact owns a 2006 chevrolet uplander. while driving approximately 5 mph on normal road conditions, the anti-lock braking system began to fully engage for a brief moment unexpectedly. the contact stated that the traction control, abs and vehicle stability control warning indicators would illuminate intermittently. in addition, the driver and passenger automatic sliding door would not operate properly. the vehicle was taken to an authorized dealer numerous times for the failures where the sliding doors, steering shaft, yaw sensor, sir module and hub bearings were replaced yet all except the sliding door failure recurred. most recently, the contact stated that when driving the automatic sliding door chime would activate continuously. the vehicle was not further repaired. the failure mileage was 14,873.
12/22/200860000
 Tl-the contact owns a 2006 chevrolet uplander. whenever the vehicle was parked going down hill it will show no fuel and the vehicle will not start. the brakes are worn down fast and causes the abs light to constantly illuminate. both left and right sliding doors doesn't open or close normally. the headlights goes in and out intermittently when driving at night. there are no warning lights illuminating showing the failure on these parts. the vehicle was taken to the dealer on more than one occassion and they cannot repair the failure. the manufacturer was contacted and offered no assistance. the failure mileage was 60,000.-mw
12/22/200860000
 Tl-the contact owns a 2006 chevrolet uplander. whenever the vehicle was parked going down hill it will show no fuel and the vehicle will not start. the brakes are worn down fast and causes the abs light to constantly illuminate. both left and right sliding doors doesn't open or close normally. the headlights goes in and out intermittently when driving at night. there are no warning lights illuminating showing the failure on these parts. the vehicle was taken to the dealer on more than one occassion and they cannot repair the failure. the manufacturer was contacted and offered no assistance. the failure mileage was 60,000.-mw
12/22/200860000
 Tl-the contact owns a 2006 chevrolet uplander. whenever the vehicle was parked going down hill it will show no fuel and the vehicle will not start. the brakes are worn down fast and causes the abs light to constantly illuminate. both left and right sliding doors doesn't open or close normally. the headlights goes in and out intermittently when driving at night. there are no warning lights illuminating showing the failure on these parts. the vehicle was taken to the dealer on more than one occassion and they cannot repair the failure. the manufacturer was contacted and offered no assistance. the failure mileage was 60,000.-mw
12/22/200860000
 Tl-the contact owns a 2006 chevrolet uplander. whenever the vehicle was parked going down hill it will show no fuel and the vehicle will not start. the brakes are worn down fast and causes the abs light to constantly illuminate. both left and right sliding doors doesn't open or close normally. the headlights goes in and out intermittently when driving at night. there are no warning lights illuminating showing the failure on these parts. the vehicle was taken to the dealer on more than one occassion and they cannot repair the failure. the manufacturer was contacted and offered no assistance. the failure mileage was 60,000.-mw
07/06/201061117
 Tl-the contact owns a 2006 chevrolet uplander. while driving approximately 15 mph he heard a rubbing noise coming from the front end of the vehicle. he stated the stabilization light on the dashboard illuminated. the vehicle was taken to an authorized dealer and the dealer was unable to duplicated the failure. the failure continue but know the brakes locks up. he stated the failure was intermittent. the vehicle was taken back to an authorized dealer on august 9, 2010 and was there for a week and again they could not duplicate the failure. the contact stated he advised the dealer to drive the vehicle for a while and that the brakes pulls hard to the right and locks up. the vehicle has not been repaired. the failure mileage was 61,117 and the current mileage was 62,370. vwb
07/06/201061117
 Tl-the contact owns a 2006 chevrolet uplander. while driving approximately 15 mph he heard a rubbing noise coming from the front end of the vehicle. he stated the stabilization light on the dashboard illuminated. the vehicle was taken to an authorized dealer and the dealer was unable to duplicated the failure. the failure continue but know the brakes locks up. he stated the failure was intermittent. the vehicle was taken back to an authorized dealer on august 9, 2010 and was there for a week and again they could not duplicate the failure. the contact stated he advised the dealer to drive the vehicle for a while and that the brakes pulls hard to the right and locks up. the vehicle has not been repaired. the failure mileage was 61,117 and the current mileage was 62,370. vwb
07/06/201061117
 Tl-the contact owns a 2006 chevrolet uplander. while driving approximately 15 mph he heard a rubbing noise coming from the front end of the vehicle. he stated the stabilization light on the dashboard illuminated. the vehicle was taken to an authorized dealer and the dealer was unable to duplicated the failure. the failure continue but know the brakes locks up. he stated the failure was intermittent. the vehicle was taken back to an authorized dealer on august 9, 2010 and was there for a week and again they could not duplicate the failure. the contact stated he advised the dealer to drive the vehicle for a while and that the brakes pulls hard to the right and locks up. the vehicle has not been repaired. the failure mileage was 61,117 and the current mileage was 62,370. vwb
07/06/201061117
 Tl-the contact owns a 2006 chevrolet uplander. while driving approximately 15 mph he heard a rubbing noise coming from the front end of the vehicle. he stated the stabilization light on the dashboard illuminated. the vehicle was taken to an authorized dealer and the dealer was unable to duplicated the failure. the failure continue but know the brakes locks up. he stated the failure was intermittent. the vehicle was taken back to an authorized dealer on august 9, 2010 and was there for a week and again they could not duplicate the failure. the contact stated he advised the dealer to drive the vehicle for a while and that the brakes pulls hard to the right and locks up. the vehicle has not been repaired. the failure mileage was 61,117 and the current mileage was 62,370. vwb
07/10/2008572001
 I have a abs light that comes on for the braking system, it says to have the abs serviced, but the brakes are new, this is a safety issue and i let chevrolet know about it, but they seem they don't care, they want me to take it in to have it diagnosed to find the problem; when they should cover all costs. this is a 2006 chevy uplander van, i'm afraid one of these times the brakes wont work and there will be deaths cause to this. also i have a problem with the power locks, they wont lock sometimes; there is only one key lock on this van and i can't lock the hitch so all the other doors i can manually lock both the hitch stays unlocked. this has become a hassle to lock the doors each time and again chevy wont fix it they want me to take it in to have it diagnosed and it is probably just a toggle switch that is broke, a replacing part that only costs $60.00. this is a theft issue that anyone can enter my van because i cant lock it. soon there will be property damage and there will be both a crash and a fire to the van. *tr
06/01/20064000
 Tl*the contact owns a 2006 chevrolet uplander. the contact stated that the vehicle rolled out of the driveway once. in addition, the abs warning light illuminates when driving in reverse or braking. the dealer replaced the front driver side wheel speed sensor three times. the vehicle was taken back to the dealer due to the abs warning light and they stated that the speed sensor needed to be replaced; however, the part for the repair is on back order. the speed was unknown. the failure mileage was 4,000 and current mileage was 17,000.
09/18/2006236662605/25/2006
 Tl*the contact owns a 2006 chevrolet uplander. a few days after purchasing the vehicle, the contact began experiencing failures with her vehicle. she had to have all the front end components replaced, including the brakes, alternator, axle, swaybar link, wheel bearings, tie rod, and tires. the dealer repaired the failures, but they are recurring. the failures were covered under warranty; however, the contact had to pay a $50 deductible. the failure mileage was 23,666 and current mileage was 49,376.
SERVICE BRAKES, HYDRAULIC - ANTILOCK
04/01/20079256
 Tl*the contact owns a 2006 chevrolet uplander. the contact was driving approximately 45 mph. the anti-lock brake system warning light indicator illuminated on the instrument panel intermittently. the vehicle was taken to an authorized dealer for the identical failure on several occasions. there was uncertainty of the repair performed on the vehicle. the failure continued to occur. additionally, there was a noise coming from the wheel area. the failure mileage was 9,256. the current mileage was 39,000. updated 4/30/10 *cn
09/11/200615264601/13/2006
 Purchased in jan 06. by sept 11, 2006 steering wheel became tight and heard noise under car when driving. steering shaft was binding and had to be replaced; could not locate noise. said may be related to steering shaft. sept 20, 2006, took car back to dealership for noise under van again; was told e-brake cable was hitting rear suspension. february 11, 2007, had to replace front worn tires with only 23, 275 miles on car and have an alignment. march 9, 2007, traction control and abs lights coming on as well as vehicle shaking. was told front brakes were 100% worn and back brakes were 80% worn and would not be replaced under warranty because this was normal wear and tear.(only had 23,989 miles on van). april 19, 2007, heard noised while driving, heard something like a spring pop, service engine light was coming on, and it was stalling when trying to start. both sway bars had to be replaced, spring pop was related to sway bars, and they could not find a problem related to the last two. now a year later with only 39,000, i have to take my car in for new brakes again. and my front tires are worn and need to be replaced again!!!!! i also had problems with my doors not closing; after they wiped off the little magnets at the bottom sometimes they still don't want to close. *tr
SERVICE BRAKES, HYDRAULIC - ANTILOCK - ABS WARNING LIGHT
06/05/200850632
 Tl*the contact owns a 2006 chevrolet uplander. the abs light illuminated and the contact took the vehicle to the dealer. she stated that the dealer did not inspect the vehicle, but only attempted to sell her another one. she took her vehicle to another mechanic and was informed that the front struts and rear shocks needed to be replaced, the rear tires were wearing and cupping badly, 25% remained on the front brake pads, 30% remained on the rear brake pads, and the rotors could not turn. the vehicle was previously taken to the dealer prior to the failures because the rear tires were making noise. the contact believes that the dealer knew something was wrong with her vehicle and waited for the warranty to expire. the current and failure mileages were 50,632.
SERVICE BRAKES, HYDRAULIC - FOUNDATION COMPONENTS - DISC - PADS
06/05/200850632
 Tl*the contact owns a 2006 chevrolet uplander. the abs light illuminated and the contact took the vehicle to the dealer. she stated that the dealer did not inspect the vehicle, but only attempted to sell her another one. she took her vehicle to another mechanic and was informed that the front struts and rear shocks needed to be replaced, the rear tires were wearing and cupping badly, 25% remained on the front brake pads, 30% remained on the rear brake pads, and the rotors could not turn. the vehicle was previously taken to the dealer prior to the failures because the rear tires were making noise. the contact believes that the dealer knew something was wrong with her vehicle and waited for the warranty to expire. the current and failure mileages were 50,632.
SERVICE BRAKES, HYDRAULIC - FOUNDATION COMPONENTS - DISC - ROTOR
11/16/200523000
 Tl*the contact owns a 2006 chevrolet uplander. while driving 50 mph, the steering column shook violently. the contact had to firmly hold the steering wheel. there were no warning lights illuminated prior to the failure. the vehicle was taken to the dealer and they stated that the front brakes and rotors failed. the vehicle was repaired at the cost of $122.07. seven months later, the failure recurred. the contact managed to safely maneuver the vehicle to her destination. the vehicle was taken to the dealer and they stated that the two front tires were failing. in addition, the vehicle failed the road force diagnostic test. the failure still persists and has not been remedied. the contact called the manufacturer and was informed that no compensation would be provided because there were no current recalls. the failure mileage was 23,000 and current mileage was 60,000.
06/05/200850632
 Tl*the contact owns a 2006 chevrolet uplander. the abs light illuminated and the contact took the vehicle to the dealer. she stated that the dealer did not inspect the vehicle, but only attempted to sell her another one. she took her vehicle to another mechanic and was informed that the front struts and rear shocks needed to be replaced, the rear tires were wearing and cupping badly, 25% remained on the front brake pads, 30% remained on the rear brake pads, and the rotors could not turn. the vehicle was previously taken to the dealer prior to the failures because the rear tires were making noise. the contact believes that the dealer knew something was wrong with her vehicle and waited for the warranty to expire. the current and failure mileages were 50,632.
02/25/20071700010001/05/2007
 Tl*the contact owns a 2006 chevrolet uplander. the contact stated that when the vehicle had a half tank of gas or less the fuel gauge failed to show an accurate reading and the vehicle shut off. the dealer replaced the fuel sensor, but the failure continued. the dealer replaced the terminals, but the gas gauge continued to display an inaccurate reading. the vehicle was taken to a different dealer, and the instrument panel was reprogrammed. the failure continued to persist. the dealer and manufacturer stated that the failure was caused by a design defect and poor engineering. the current and failure mileages were 17,000. *ak the reverse light was out, the rear hatch would not lock, the wiper blade fell off, the rotors had to be machined. updated 07/06/07*jb