1991 GMC Sonoma Problems: 1 Known Issue
1991 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1991 GMC Sonoma has 1 documented issue. None of the listed issues is rated critical; this is not a complete reliability assessment. Across all issues with published estimates, repair costs range from $400 to $800. DIY maintenance guides at au7o.io.
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All 1 Known Issue
NHTSA Recalls6 recalls
FUEL SYSTEM, OTHER:STORAGE:TANK ASSEMBLY:PRESSURE RELIEF DEVICES
CERTAIN DELPHI FUEL PRESSURE REGULATORS, P/NOS. FP10020-11B1, FP10026-11B1, AND FP10027-11B1, SOLD AFTER JANUARY 9, 2007, AS AFTERMARKET EQUIPMENT FOR VARIOUS PASSENGER VEHICLES LISTED ABOVE. THE UNIVERSAL PRESSURE REGULATORS (UPR) WERE PRODUCED WITHOUT AN O'RING AND RETAINER.
EQUIPMENT:OTHER:LABELS
VEHICLE DESCRIPTION: LIGHT DUTY PICKUP TRUCKS AND SPORT UTILITY VEHICLES. SOME OF THESE VEHICLES WERE BUILT WITH INCORRECT PAYLOAD INFORMATION ON THE VEHICLE CERTIFICATION LABEL. THE PAYLOAD SHOWN ON THE LABEL IS GREATER THAN THE MAXIMUM VALIDATED PAYLOAD. IF THE VEHICLE WERE LOADED TO THE INCORRECTLY LABELED PAYLOAD, IT MAY NOT RIDE AND HANDLE IN THE MANNER THAT THE DRIVER EXPECTS.
SEAT BELTS
VEHICLE DESCRIPTION: PASSENGER VEHICLES, LIGHT DUTY TRUCKS, SPORT UTILITY VEHICLES, AND MINI VANS EQUIPPED WITH TRW SEAT BELT BUCKLE ASSEMBLIES. THE BUCKLE BASE OF THESE SEAT BELT ASSEMBLIES WERE NOT PROPERLY HEAT TREATED AND THEREFORE DO NOT PASS THE LOAD BEARING REQUIREMENT OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 209, "SEAT BELT ASSEMBLIES."
EQUIPMENT:OTHER:LABELS
CERTAIN PICKUP TRUCKS AND SPORT UTILITY VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 208, "OCCUPANT CRASH PROTECTION."
SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP
VEHICLE DESCRIPTION: S -TRUCKS EQUIPPED WITH 2 WHEEL DRIVE. THESE VEHICLES MAY HAVE HAD THE RIGHT-HAND ANTILOCK BRAKE SYSTEM (ABS) MODULE FEED PIPE AND/OR BRAKE CROSSOVER PIPE TUBE NUTS TIGHTENED WITHOUT SEATING THE PIPE-FLARED-ENDS ENOUGH TO WITHSTAND NORMAL ASSEMBLY AND VEHICLE INPUTS WITHOUT PARTIALLY UNSEATING. THIS DOES NOT COMPLY WITH REQUIREMENTS OF FMVSS NO. 105, "HYDRAULIC SERVICE BRAKE NORMAL, EMERGENCY, AND PARK BRAKING PERFORMANCE."
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Frequently Asked Questions
What are the most common GMC Sonoma problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1991 GMC Sonoma has 1 documented issue. The documented issue is: In-Tank Fuel Pump Failure. None are rated critical, but regular maintenance is recommended.
Is the GMC Sonoma reliable?
The 1991 GMC Sonoma has 1 known issue compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. None of the matching records is rated critical; this is not a complete reliability assessment. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common GMC Sonoma problems?
Repair costs for known GMC Sonoma issues range from $400 to $800, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 1991-2004 GMC Sonoma In-Tank Fuel Pump Failure?
Same fuel pump failure issues as the S-10. The in-tank pump fails from heat and debris. Repairs typically run $400-$800. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.