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 Problems

Check 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.

Erratic Fuel Gauge Operation

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.

Check Engine Light Due to Gas Cap Issue

A Loose or worn gas cap may cause Check Engine Light to illuminate.

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2002 GMC Sonoma Questions

why 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

My number 4 & 5 are missing what can cause this. (1 answer)

We changed the intake gasket the rotor cap changed the plugs. There's no water in the oil and it does not smoke

I need to change the pump clutch but cant find any help. Please i need help asp. (1 answer)

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2002 GMC Sonoma Reviews

Have had the Ext Cab V6 engine model since new (now 91,000 miles). Now have problem with ABS LIGHT on dash - no one knows what to do to fix it. Have replaced the 3rd door latch 3 times - running lights go off when direction signal is on - but seems everyone has the same problem and GM does nothing to remedy it. Do routine maintenance and it will run forever, I hope. Would rather spend a couple ...
I have a 02 GMC Sonoma and the passager side cab is rusting. The thired door handle broken because its plastic. Its automatic and some times when shifting it does not seem like it wants to shift. The daytime running lights work but when I turn on the turn signial they go out until the turn signial goes out.
A door pin was replaced and then the third door was readjusted and wind noise is gone. Have problems with seat belt on occasion not retracking properly. Still get antifreeze smell on certain dial settings. The truck has developed wind noise on the drivers side door upper right. Had trouble keeping the antenna screwed on but I think the dealer took care of that. Tried E-85 fuel but truck ...

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