GMC Sonoma Repair and Maintenance

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

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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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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

New battery and fuel pump still won't start it's been sitting for about a month (1 answer)

Have checked fuel pressure from Schrader valve next to fire wall have good pressure just don't know what else it could be

Injectors are putting too much fuel into the cylinders (1 answer)

Injecting too much fuel into the cylinders. Injectors are new, pressure regulator is new. Plugs are new.????

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GMC Sonoma Recalls

Air 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.

GM Recalls 2000 Chevrolet S10, GMC Sonoma, Olds Bravada Due to Incorrect Payload Rating

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.

Recall 00V220000
VEHICLE DESCRIPTION: LIGHT DUTY PICKUP TRUCKS AND SPORT UTILITY VEHICLES. THESE VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FMVSS NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT." THE DAYTIME RUNNING LIGHTS BUILT WITH A CANDELA VALUE GREATER THAN 3,000 CANNOT BE MOUNTED HI...

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GMC Sonoma Reviews

Bought 1997 Sonoma with 4.3 V6 and 5 speed Trans with 36000 miles on her. Since then I have 0ver 373000 miles on her as of today. She's one tough truck. Since New I have replaced 1 water pump, 1 fuel pump, 1 intake gasket. Believe it or not. I,m still on the original clutch, though She starting to chirp once in a while now. So my baby letting me know its getting to be time for replacement. I'm ...
We have just hit 198,000 miles today with no major problems our 14 years together have been good she had 6 miles when I bought her and yes there has been a lot of parts replaced but she only stranded me once when I put a cheap starter on her. she has only had mobile one oil and will run very ruff if she sits for more than 4 days. any way you do the math she is well worth it, and I don't know wh...
I HAVE A 2000 GMC SONOMA. I'VE REPLACED JUST ABOUT EVERYTHING ON IT. THIS IS MY SECOND GMC TRUCK BUT I WILL NEVER OWN A THIRD ONE. NOTHING BUT TROUBLE FROM THE BEGINNING. TOTAL COST OF REPAIRS AROUND $15,000. I BOUGHT THE TRUCK NEW FOR $17,000. NEXT PROBLEM THE TRUCK GOES TO JUNK YARD.

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