IllustrationWHILE APPROACHING A STOP SIGN, ME DRIVER SEAT SLID FORWARD AS I SLOWED. THE LOCKING DEVICE, A SMALL PLASTIC DEVICE, HAD BROKEN UNDER THE SEAT. THIS ALLOWED THE SEAT TO SLIDE FORWARD AND BACKWARD. I HAD TO WEDGE A PIECE OF WOOD PLANK BETWEEN THE SEAT AND THE FIREWALL IN ORDER TO GET MY VEHICLE HOME. *TR
1999 Chevrolet Silverado 1500
Owner reports · Recalls · Investigations
Similar to other model years
Owner complaints for the 1999 Chevrolet Silverado 1500 do not stand out strongly from the model-year median of 525.
About this comparison →How this year compares
Owner complaints by model year
Compare all Silverado 1500 years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
130–25K
3725–50K
6150–75K
6275–100K
141100–150K
104150K+
418 reports with mileage · 169 unknown
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
- Service Brakes, Hydraulic. Review the 222 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Service Brakes. Review the 126 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Structure. Review the 53 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
43 crash reports5 fire reports18 injury reports
Seats complaints
30 reportsTHE DRIVERS SIDE POWER SEAT MOTOR HAS PLAY IN IT AND ALLOWS THE SEAT TO MOVE 1-2 INCHES BACK AND FORTH AS THE TRUCK BRAKES OR ACCELERATES. THE PASSENGER SIDE SEAT IS ALSO JAMMED AND NO LONGER MOVES AT ALL. *TR
THE SEAT LATCH ON MY 1999 CHEVROLET SILVERADO 1500 BROKE ALLOWING THE SEAT TO MOVE FREELY. MY 16 YEAR OLD SON WAS DRIVING AT THE TIME AND NEARLY HAD AN ACCIDENT BECAUSE OF IT. THE EXACT SAME CONDITION OCCURRED WHEN THE TRUCK WAS NEARLY NEW (I AM THE ORIGINAL OWNER). THE DEALER FIXED THE SEAT ADJUSTER THE FIRST TIME. THIS IS A VE…
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THE SEAT LATCH ON MY 1999 CHEVROLET SILVERADO 1500 BROKE ALLOWING THE SEAT TO MOVE FREELY. MY 16 YEAR OLD SON WAS DRIVING AT THE TIME AND NEARLY HAD AN ACCIDENT BECAUSE OF IT. THE EXACT SAME CONDITION OCCURRED WHEN THE TRUCK WAS NEARLY NEW (I AM THE ORIGINAL OWNER). THE DEALER FIXED THE SEAT ADJUSTER THE FIRST TIME. THIS IS A VERY DANGEROUS DEFECT. THE REPLACEMENT PARTS MUST BE MORE ROBUST. AFTER READING ALL OF THE INCIDENTS OF THE SAME PROBLEMS ONLINE, I CANNOT BELIEVE THERE HAS NOT BEEN A RECALL. ARE YOU WAITING FOR A FATALITY? *TR
1999 CHEVROLET SILVERADO 1500 PICKUP TRUCK DRIVERS SIDE POWER SEAT HAS ABOUT 1" BACK AND FORTH MOVEMENT WHILE DRIVING. TRACKS LOOK TIGHT. PROBLEM LOOKS INTERNAL TO THE DRIVE MOTOR OR GEAR. NOT SAFE WHILE BRAKING OR ACCELERATING. *TR
1999 CHEVY SILVERADO. ON 1/21/11 I PULLED THE MANUAL RELEASE LEVER TO RELEASE THE DRIVER'S SIDE SEAT AND LOAD MATERIAL INTO THE EXTENDED CAB OF MY PICKUP. A PLASTIC PIECE WITH METAL COMPONENTS INSIDE THE TRACK (QUOTED FROM DEALER AS A SEAT ADJUSTER) FELL OUT OF THE RIGHT SIDE TRACK. MY DRIVER'S SIDE SEAT WOULD NOT AND CONTINUES…
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1999 CHEVY SILVERADO. ON 1/21/11 I PULLED THE MANUAL RELEASE LEVER TO RELEASE THE DRIVER'S SIDE SEAT AND LOAD MATERIAL INTO THE EXTENDED CAB OF MY PICKUP. A PLASTIC PIECE WITH METAL COMPONENTS INSIDE THE TRACK (QUOTED FROM DEALER AS A SEAT ADJUSTER) FELL OUT OF THE RIGHT SIDE TRACK. MY DRIVER'S SIDE SEAT WOULD NOT AND CONTINUES NOT TO LOCK INTO PLACE, CAUSING ME TO HAVE TO DRIVE WITH ONE FOOT ON THE FLOORBOARD, AND USE THE OTHER TO ACCELERATE AND BRAKE CONTINUOUSLY. WHEN DRIVEN, THE SEAT FREELY MOVES FORWARD AND BACKWARD WITH CENTRIFUGAL FORCE. NOTE: THE SEATBELT IS ATTACHED TO THE SEAT COMPLETELY, NOT ANCHORED TO THE SIDEWALL AND FLOOR OF THE VEHICLE, SO THERE IS NOTHING TO KEEP A DRIVER FROM SLIDING ALL THE WAY TO THE STEERING WHEEL IF AND WHEN THIS PIECE FAILS. *TR
WAS NOT DRIVING VEHICLE AT TIME, SIMPLY GETTING SOMETHING OUT OF BACK SEAT, NEXT MORNING, SEAT WOULD NOT LOCK INTO PLACE DUE TO WHITE PLASTIC PART IN SEAT TRACK OF 1999 CHEVROLET SILVERADO WHICH PREVENTS SLIDING BACK AND FORTH HAS BROKEN. I HAVE ALREADY REPLACED THIS SEAT TRACK ONCE BEFORE, SINCE THE PLASTIC PART ITSELF IS NOT A…
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WAS NOT DRIVING VEHICLE AT TIME, SIMPLY GETTING SOMETHING OUT OF BACK SEAT, NEXT MORNING, SEAT WOULD NOT LOCK INTO PLACE DUE TO WHITE PLASTIC PART IN SEAT TRACK OF 1999 CHEVROLET SILVERADO WHICH PREVENTS SLIDING BACK AND FORTH HAS BROKEN. I HAVE ALREADY REPLACED THIS SEAT TRACK ONCE BEFORE, SINCE THE PLASTIC PART ITSELF IS NOT AVAILABLE FOR PURCHASE. THE FIRST TIME IT BROKE, I WAS BRAKING AND NEARLY HAD AN ACCIDENT. REPLACEMENT WAS $250 FROM DEALER, ENTIRE SEAT TRACK HAS TO BE REPLACED. *TR
I HAVE 99 CHEVROLET SILVERADO 1500 LS 2WD WITH 6-WAY POWER SEATS. BOTH THE PASSENGER AND DRIVER SEATS MOVE FRONT AND BACK DURING BRAKING OR ACCELERATION. THE MOVEMENT IS AS MUCH AS 1 INCH. THE MOVEMENT HAS INCREASINGLY BECOME MORE SINCE I FIRST NOTICED THE PROBLEM IN 2006. I AM VERY CONCERNED THAT THIS PROBLEM POSES A SAFETY …
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I HAVE 99 CHEVROLET SILVERADO 1500 LS 2WD WITH 6-WAY POWER SEATS. BOTH THE PASSENGER AND DRIVER SEATS MOVE FRONT AND BACK DURING BRAKING OR ACCELERATION. THE MOVEMENT IS AS MUCH AS 1 INCH. THE MOVEMENT HAS INCREASINGLY BECOME MORE SINCE I FIRST NOTICED THE PROBLEM IN 2006. I AM VERY CONCERNED THAT THIS PROBLEM POSES A SAFETY RISK IN A PANIC STOP OR COLLISION SITUATION. THE SEAT(S) MAY BREAK LOOSE AND SLIDE FULL FORWARD AND/OR BACKWARD RESULTING IN LOSS OF CONTROL OR BRAKING RESULTING IN INJURY OR DEATH, AND PROPERTY DAMAGE. AIRBAG SAFEGUARD WOULD BE RENDERED USELESS BECAUSE THE SEAT MOVES IN A UNPREDICTABLE WAY THAT WAS NEVER ANALYZED BY MANUFACTURER'S TESTING. *TR
SUNDAY, OCTOBER 11, 2009 I PULLED THE MANUAL RELEASE LEVER TO RELEASE THE DRIVER'S SIDE SEAT AND LOAD MATERIAL INTO THE EXTENDED CAB OF MY PICKUP. A PLASTIC PIECE WITH METAL COMPONENTS INSIDE THE TRACK (QUOTED FROM DEALER AS A SEAT ADJUSTER) FELL OUT OF THE RIGHT SIDE TRACK. MY DRIVER'S SIDE SEAT WOULD NOT AND CONTINUES NOT TO …
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SUNDAY, OCTOBER 11, 2009 I PULLED THE MANUAL RELEASE LEVER TO RELEASE THE DRIVER'S SIDE SEAT AND LOAD MATERIAL INTO THE EXTENDED CAB OF MY PICKUP. A PLASTIC PIECE WITH METAL COMPONENTS INSIDE THE TRACK (QUOTED FROM DEALER AS A SEAT ADJUSTER) FELL OUT OF THE RIGHT SIDE TRACK. MY DRIVER'S SIDE SEAT WOULD NOT AND CONTINUES NOT TO LOCK INTO PLACE, CAUSING ME TO HAVE TO DRIVE WITH ONE FOOT ON THE FLOORBOARD, AND USE THE OTHER TO ACCELERATE AND BRAKE CONTINUOUSLY. WHEN DRIVEN, THE SEAT FREELY MOVES FORWARD AND BACKWARD WITH CENTRIFUGAL FORCE. NOTE: THE SEATBELT IS ATTACHED TO THE SEAT COMPLETELY, NOT ANCHORED TO THE SIDEWALL AND FLOOR OF THE VEHICLE, SO THERE IS NOTHING TO KEEP A DRIVER FROM SLIDING ALL THE WAY TO THE STEERING WHEEL IF AND WHEN THIS PIECE FAILS. I IMMEDIATELY STOPPED DRIVING THE UNSAFE VEHICLE, AND TRANSPORTED IT TO A LOCAL CHEVROLET DEALERSHIP, FIVESTAR, IN ABERDEEN, WA. THE DEALERSHIP CALLED TODAY, OCTOBER 13, 2009, WITH AN ESTIMATED COST OF JUST OVER $800.00. DEALER SAID THAT BOTH TRACKS NEED REPLACING, BECAUSE NEITHER ONE IS LOCKING. ESTIMATED COST $250.00 PER TRACK, PLUS THE LABOR AND TAXES. I HAVE ORDERED THIS WORK TO BE DONE. *TR
TL*THE CONTACT OWNS A 1999 CHEVROLET SILVERADO 1500. THE CONTACT STATED THAT THE DRIVER SIDE FRONT SEAT WAS UNSTABLE AND THE SEAT MOVES BACK AND FORTH WHILE DRIVING. AN AUTHORIZED TECHNICIAN STATED THAT HE WOULD HAVE TO PAY $430.00 PER SEAT TO REPLACE THE SEAT UNIT. NO REPAIRS WERE MADE. THE MANUFACTURER WAS NOTIFIED, BUT NO ASS…
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TL*THE CONTACT OWNS A 1999 CHEVROLET SILVERADO 1500. THE CONTACT STATED THAT THE DRIVER SIDE FRONT SEAT WAS UNSTABLE AND THE SEAT MOVES BACK AND FORTH WHILE DRIVING. AN AUTHORIZED TECHNICIAN STATED THAT HE WOULD HAVE TO PAY $430.00 PER SEAT TO REPLACE THE SEAT UNIT. NO REPAIRS WERE MADE. THE MANUFACTURER WAS NOTIFIED, BUT NO ASSISTANCE WAS PROVIDED.. THE FAILURE MILEAGE WAS 47,000. THE CURRENT MILEAGE WAS 50,430. UPDATED 10/21/09. *LJ THE CONSUMER STATED BOTH SEATS EXHIBITED THE PROBLEM. UPDATED 10/20/09*JB
THE LATCH MECHANISM FOR THE DRIVERS SIDE SEAT ADJUSTMENT FAILED, ALLOWING THE SEAT TO SLIDE FRONT TO BACK. THE FAILURE OCCURRED WHEN THE SEAT WAS BEING MOVED FORWARD TO PLACE ITEMS BEHIND THE SEAT. PLASTIC PIECES FELL OUT ONTO THE FLOOR. IT APPEARED TO BE A PLASTIC PIECE THAT HELD THE LOCKING PIN FOR THE SEAT. THE TEMPERATURE TH…
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THE LATCH MECHANISM FOR THE DRIVERS SIDE SEAT ADJUSTMENT FAILED, ALLOWING THE SEAT TO SLIDE FRONT TO BACK. THE FAILURE OCCURRED WHEN THE SEAT WAS BEING MOVED FORWARD TO PLACE ITEMS BEHIND THE SEAT. PLASTIC PIECES FELL OUT ONTO THE FLOOR. IT APPEARED TO BE A PLASTIC PIECE THAT HELD THE LOCKING PIN FOR THE SEAT. THE TEMPERATURE THAT DAY HAD BEEN BETWEEN 20 AND 30 DEGREES F. THE VEHICLE HAD TO BE DRIVEN HOME. WHEN YOU APPLIED THE BRAKE, THE SEAT MOVED FORWARD. WHEN YOU APPLIED THE GAS, THE SEAT MOVED ALL THE WAY BACK. *TR
Official recalls
0No recalls in this snapshot.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
2EA04011 · Parking Brake Failure
Opened Apr 9, 2004 · Closed May 10, 2005
Status: closed (inferred from source dates) · Parking Brake; Parking Brake:conventional; Parking Brake:conventional:mechanical; Parking Brake:conventional:mechanical:linkage And Cable
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Additional source detail variants (4)
Parking Brake:conventional
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Parking Brake:conventional:mechanical
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Parking Brake:conventional:mechanical:linkage And Cable
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
Parking Brake
IN A LETTER DATED APRIL 20, 2005, GM NOTIFIED NHTSA THAT IT HAD DECIDED THAT DEFECTS THAT RELATE TO MOTOR VEHICLE SAFETY EXIST IN CERTAIN MODEL YEAR (MY) 1999-2002 C/K 1500 SERIES (PBR PARKING BRAKE SYSTEM) AND MY 2001-2005 C/K 2500 AND 3500 SERIES (TRW PARKING BRAKE SYSTEM) PICKUPS WITH MANUAL TRANSMISSIONS.ACCORDING TO GM, SOME OF THESE VEHICLES MAY HAVE CONDITIONS THAT CAUSE THE FRICTION LININGS TO WEAR TO AN EXTENT WHERE THE PARKING BRAKE CAN BECOME INEFFECTIVE IN IMMOBILIZING A PARKED VEHICLE.GM'S ACTION COVERS AN ESTIMATED TOTAL OF 142,585 VEHICLES.DEALERS WILL INSTALL A LOW-FORCE SPRING CLIP RETAINER FOR VEHICLES EQUIPPED WITH THE PBR PARKING BRAKE SYSTEM AND INSTALL A REDESIGNED PARKING BRAKE CABLE ASSEMBLY ON VEHICLES EQUIPPED WITH THE TRW PARKING BRAKE SYSTEM. A TOTAL OF 58 NON-DUPLICATIVE COMPLAINTS WERE RECEIVED BY ODI AND GM CONCERNING THE APPROXIMATELY 59,000 MY 1999-2002 C/K 1500 SERIES PICKUP TRUCKS WITH THE PBR PARKING BRAKE SYSTEM.THESE INCLUDED 22 ALLEGED ROLLAWAY INCIDENTS, RESULTING IN A RATE OF 38.5 ROLLAWAY INCIDENTS PER 100,000 VEHICLES.ODI IS AWARE OF 24 COMPLAINTS REGARDING THE MY 2001-2005 C/K 2500 AND 3500 SERIES MANUAL TRANSMISSION TRUCKS RECALLED BY GM, INCLUDING 5 ALLEGING ROLLAWAY INCIDENTS.THOUGH THE CONDITIONS DESCRIBED IN GM'S LETTER ARE ALSO PRESENT IN THE C/K TRUCKS WITH AUTOMATIC TRANSMISSIONS, THE ROLLAWAY RATE IN THOSE VEHICLES WAS SIMILAR TO THOSE OBSERVED IN PEER VEHICLES STUDIED BY ODI IN THIS INVESTIGATION.THIS ENGINEERING ANALYSIS IS CLOSED. FOR ADDITIONAL INFORMATION, SEE THE ATTACHED CLOSING REPORT.
PE03057 · Parking Brake Failure
Opened Dec 8, 2003 · Closed Apr 9, 2004
Status: closed (inferred from source dates) · Parking Brake
ODI OPENED PE03-057 TO ASSESS PARKING BRAKE INEFFECTIVENESS IN THE SUBJECT VEHICLES.THESE VEHICLES ARE EQUIPPED WITH FOUR WHEEL DISC BRAKES THAT INCORPORATE A SINGLE-SHOE DRUM-IN-HAT PARKING BRAKE INDEPENDENT OF THE SERVICE BRAKES.COMPLAINT AND WARRANTY DATA INDICATE THAT THE PARKING BRAKE LININGS TEND TO WEAR OUT EARLY IN THE LIFE OF THE VEHICLE (AT AN AVERAGE OF 24 MONTHS IN SERVICE), REDUCING THE PARKING BRAKE SYSTEM'S TORQUE BELOW THAT NEEDED TO IMMOBILIZE THE VEHICLE.GM HAS ATTRIBUTED THIS ACCELERATED WEAR TO FOREIGN MATERIAL INTRUSION AND A FAILURE OF THE BRAKE SHOE TO PROPERLY SELF-CENTER WITHIN ITS BRAKE DRUM.EFFECTIVE WITH THE START OF MY 2003 PRODUCTION, A NEWER REDUCED FORCE HOLD-DOWN CLIP WAS INTRODUCED TO FACILITATE BRAKE SHOE DISENGAGEMENT FROM THE DRUM SURFACE.THIS PART IS ALSO AVAILABLE AT THE SERVICE LEVEL FOR THE MY 1999-2002 VEHICLES.GM HAS INDICATED THAT THE PAKING BRAKE IS INTENDED TO OPERATE IN CONJUNCTION WITH THE TRANSMISSION TO IMMOBILZE PARKED VEHICLES, AND THAT IN MANY CASES, ACCELERATED PARKING BRAKE LINING WEAR IS CAUSED BY ROUGH USE, VEHICLE MODIFICATIONS, AND DRIVING WITH THE PARKING ENGAGED. ODI HAS UPGRADED THE PRELIMINARY EVALUATION TO AN ENGINEERING ANALYSIS TO GATHER FURTHER INFORMATION CONCERNING PARKING BRAKE USAGE FACTORS AND THE CIRCUMSTANCES SURROUNDING THE SEVENTEEN REPORTED VEHICLE CRASHES.