1991 GMC Sonoma Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1991 GMC Sonoma

1991 GMC Sonoma Problems

Electrical Contacts in the Ignition Switch May Fail

The electrical contacts in the ignition switch may fail and result in erratic instrument panel gauge operation or illumination of the Check Engine Light. A failed ignition switch will require replacement.

Heater Core Under Right Side of Dashboard May Leak Engine Coolant

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.

Check Engine Light Due to Oxygen Sensor Failure

The oxygen sensor can fail causing Check Engine Light illumination and the engine to run rich (burn more fuel than normal).

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1991 GMC Sonoma Questions

My 1991 gmc sonoma 4.3 liter is loosing too much water (1 answer)

and I don't know why i just had my heads and my throttle body redone it was blowing clouds of white smoke every time I turned it on or let it sit while running now it does it only when it's cold or low on water.... need some ones opinion !

My ignition is stuck in the locked position. Is it an easy fix? (1 answer)

I just bought the truck. I started it just about 2 weeks before I bought it, it ran fine. I go to start it after I bought it and the ignition is stuck in the locked position. I can't move any of the pieces. Not even the unlock switch.

Driver side door "drops" when opened. (1 answer)

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1991 GMC Sonoma Recalls

Recall 99V193000
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-...

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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.

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