The Anti-lock brake system (ABS) control unit may fail internally causing the ABS warning light to illuminate.
Resources for the Repair and Maintenance of your 1991 GMC Sonoma
1991 GMC Sonoma
1991 GMC Sonoma Problems
The heater core under the right side of the dashboard may leak engine coolant which can puddle on the passenger front floor. The loss of coolant may cause an engine overheating condition. Our technicians tell us that removal of the dash board is necessary to replace the heater on these vehicles.
Our technicians highly recommend that the transmission is serviced every 30,000 miles to avoid problems and maintain optimal operating order.
The power door locks may stop working in one or more doors due to a failed actuator. Replacement of the failed actuator should correct this concern.
A door window may move slowly or stop in mid travel due to a failing power window motor. The affected window may start working again after the motor cools off. Replacing the faulty window motor will commonly correct this concern.
1991 GMC Sonoma Recalls (Recent)
Summary: VEHICLE DESCRIPTION: CERTAIN 4-WHEEL DRIVE PICKUP TRUCKS AND SPORT UTILITY VEHICLES EQUIPPED WITH ABS (ANTILOCK BRAKING SYSTEM) MANUFACTURED FROM SEPTEMBER 1989 THROUGH AUGUST 1996. UNDER CERTAIN DRIVING CONDITIONS THE SWITCH WHICH SIGNALS THE ABS SYSTEM WHETHER THE VEHICLE IS IN 2-WHEEL OR 4-WHEEL DRIVE CAN MALFUNCTION CAUSING INCREASED STOPPING DISTANCES DURING ABS STOPS WHILE IN THE TWO-WHEEL DRIVE MODE.Learn more »
1991 GMC Sonoma Questions and Answers
My turn signals won't flash, but the do turn on. I changed the flasher and nothing changed. I see that the hazard lights don't work at all. Does the hazard flasher need to be replaced ...
I've checked the fuses on this and all is well on these. Any suggestions for testing purposes?
I've replaced the manual transmission with a T5. I've put in Dextron/Equiv. fluid in this, as it is the recommended trans. fluid for it according to my Haynes repair manual... I replaced ...
Does anyone know the torque specs for the power steering pump bracket which attaches to engine. It uses 3 bolts, and if tightened too much, it cracks, as it's made of cast aluminum.
This just started up on me. I inspected the right rotor and brake pads on the pass. side and the rotor was wore bad on the back side. I put another rotor and brake pads on and I tested it afterward...
1991 GMC Sonoma Reviews
Good truck have broken it in with 453,000 on it . All original motor 4.3 just keeps going and going. Passes emish with flying colors. Just keep them cool and tuned and run super in it will last for ever.
This truck is dependable for work use for me. I replaced the engine in this and at the same time replaced the transmission with the correct one. The image here is not the same type as mine as mine is a swb with a regular cab. Has a 5 speed transmission with a 2.5L engine in it.