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GMC Sonoma Problems

Find the most common issues based on GMC Sonoma owner complaints.
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Most Common GMC Sonoma Problems

The Anti-lock brake system (ABS) control unit may fail internally causing the ABS warning light to illuminate.
The fuel pump may fail causing the engine to stall and not restart. Our technicians recommend replacing the fuel filter every 30,000 miles to help prevent undue strain on the fuel pump.
The distributor may develop internal faults. This can cause a rough running engine or stalling condition and the Check Engine Light may or may not illuminate. The distributor should be overh...
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1 Known GMC Sonoma Brakes Problem

The Anti-lock brake system (ABS) control unit may fail internally causing the ABS warning light to illuminate.

3 Known GMC Sonoma Drive Train Problems

A fluid leak may develop from the transmission output shaft seal. This leak may cause the transmission mount to become oil soaked and require replacement of the mount along with the leak repair.
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 fo...
Our technicians highly recommend that the transmission is serviced every 30,000 miles to avoid problems and maintain optimal operating order.

6 Known GMC Sonoma Electrical & Lights Problems

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 pum...
A door window may move slowly or stop in mid travel due to a failing power window motor. The affected window may start working again after the motor cools off. Replacing the faulty window mot...
The power door locks may stop working in one or more doors due to a failed actuator. Replacement of the failed actuator should correct this concern.

13 Known GMC Sonoma Engine Problems

The fuel pump may fail causing the engine to stall and not restart. Our technicians recommend replacing the fuel filter every 30,000 miles to help prevent undue strain on the fuel pump.
The distributor may develop internal faults. This can cause a rough running engine or stalling condition and the Check Engine Light may or may not illuminate. The distributor should be overh...
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Running the engine wit...

5 Known GMC Sonoma Exhaust & Emissions Problems

A Loose or worn gas cap may cause Check Engine Light to illuminate.
The oxygen sensor can fail causing Check Engine Light illumination and the engine to run rich (burn more fuel than normal).
The 1998-2002 GMC Sonoma has a known issue with the air pump check valve which causes illumination of the check engine light. There are no notable symptoms, but the vehicle will not pass state insp...

2 Known GMC Sonoma Heating & Air Conditioning Problems

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 tech...
The HVAC blower motor may stop working at one or more speeds due to a faulty blower motor resistor block. Our technicians recommend to confirm the resistor is at fault by first checking the o...

3 Known GMC Sonoma Maintenance Problems

GM recommends replacing the engine coolant at 100,000 miles; however, our technicians tell us that the coolant may become contaminated and require a complete cooling system flush every 60,000 to 70...
Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.
Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.

1 Known GMC Sonoma Miscellaneous Problem

The CD player in the radio may fail. Our technicians tell us that the radio will need to be removed and sent out to a radio repair shop to correct this condition.

0 Known GMC Sonoma Suspension & Steering Problems

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Known GMC Sonoma Problems & Complaints

The Anti-lock brake system (ABS) control unit may fail internally causing the ABS warning light to illuminate.
The headlight switch used on the GMC Sonoma is known to fail through normal operation. Since the headlight switch is also integrated into the interior lights, a malfunctioning switch can cause issu...
The HVAC blower motor may stop working at one or more speeds due to a faulty blower motor resistor block. Our technicians recommend to confirm the resistor is at fault by first checking the o...
On vehicles with intermittent windshield wipers, the wiper motor circuit board may fail and cause the wipers to stop working at times. Replacing the circuit board should resolve the issue. So...
The distributor may develop internal faults. This can cause a rough running engine or stalling condition and the Check Engine Light may or may not illuminate. The distributor should be overh...
The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Running the engine wit...
Our technicians highly recommend that the transmission is serviced every 30,000 miles to avoid problems and maintain optimal operating order.
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 pum...
A door window may move slowly or stop in mid travel due to a failing power window motor. The affected window may start working again after the motor cools off. Replacing the faulty window mot...
This engine may leak oil from the valve cover gasket.
A fluid leak may develop from the transmission output shaft seal. This leak may cause the transmission mount to become oil soaked and require replacement of the mount along with the leak repair.
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 tech...
An engine oil leak may develop from the distributor shaft o-ring seal.
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 fo...
The 1998-2002 GMC Sonoma has a known issue with the air pump check valve which causes illumination of the check engine light. There are no notable symptoms, but the vehicle will not pass state insp...
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