GMC Sonoma Repair and Maintenance
A guide to problems, costs, maintenance and repair for your GMC Sonoma
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GMC Sonoma ProblemsCheck Engine Light With Code P1870
Vehicles equipped whit a 4 speed automatic transmission may develop a harsh 1-2 shift and/or illumination of the Check Engine Light with code P1870 stored. This can be caused by wear of the bore for the TCC isolator and regulator valves in the valve body. This condition does not commonly occur until the transmission reaches normal operating temperature. If the valve body is worn, replacement will be necessary to correct this concern.
It is common for the fuel level sensor in the fuel tank read the fuel level incorrectly. The sensor must be replaced to correct the condition. Our technicians recommend having the complete fuel pump module replaced on high mileage vehicles.
A Loose or worn gas cap may cause Check Engine Light to illuminate.
GMC Sonoma Questionswhy does the fuel gauge show low fuel light when tank is almost full? (2 answers)
I changed fuel pump because it stopped working. installed new style ac delco pump assembly. fuel gauge worked just fine before that. new connector and wire splicing is correct. truck engine is running not a good gauge reading
Have checked fuel pressure from Schrader valve next to fire wall have good pressure just don't know what else it could be
Injecting too much fuel into the cylinders. Injectors are new, pressure regulator is new. Plugs are new.????
GMC Sonoma RecallsAir Bag Labels May Be Incorrect
Vehicles may have an air bag warning label with incorrect statements. This is against the Federal Motor Vehicle Safety Standard. Owners will be sent corrected labels and installation instructions. The recall began June 4, 2004. The GM recall number is 04021.
The payload as listed on the vehicle certification label exceeds the actual limitations of the vehicle. If the weight limitations of the vehicle are exceeded, the vehicle will not operate as designed, and may cause a safety issue. Owners will be sent a revised vehicle certification label that is accurate.