2002 GMC Sonoma Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2002 GMC Sonoma
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2002 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.
2002 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
We changed the intake gasket the rotor cap changed the plugs. There's no water in the oil and it does not smoke