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GMC S15 Problems

Find the most common issues based on GMC S15 owner complaints.
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Most Common GMC S15 Problems

An oil leak may develop from the distributor o-ring seal requiring replacement of the seal.
A coolant leak may develop from the water pump. This can result in an engine overheating condition. A leaking water pump will require replacement.
The alternator may fail, causing a "no charge" condition. An internal bearing may also fail and cause an abnormal noise. If the vehicle is driven too long with a failed bearing, the alternator may ...
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1 Known GMC S15 Brakes Problem

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

2 Known GMC S15 Drive Train Problems

Our technicians highly recommend that the transmission is serviced every 30,000 miles to avoid problems and maintain optimal operating order.
The transmission output shaft seal may leak transmission fluid. On 2WD models, this leak can cause the transmission mount to become oil soaked, which will require replacement of the mount along w...

3 Known GMC S15 Electrical & Lights Problems

The electrical contacts in the ignition switch may fail and result in erratic instrument panel gauge operation or illumination of the Check Engine Light. A failed ignition switch will require repla...
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.

8 Known GMC S15 Engine Problems

An oil leak may develop from the distributor o-ring seal requiring replacement of the seal.
This engine may leak oil from the valve cover gasket.
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...

1 Known GMC S15 Exhaust & Emissions Problem

The oxygen sensor can fail causing Check Engine Light illumination and the engine to run rich (burn more fuel than normal).

1 Known GMC S15 Heating & Air Conditioning Problem

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...

1 Known GMC S15 Maintenance Problem

Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.

0 Known GMC S15 Miscellaneous Problems

0 Known GMC S15 Suspension & Steering Problems

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Known GMC S15 Problems & Complaints

The Anti-lock brake system (ABS) control unit may fail internally causing the ABS warning light to illuminate.
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.
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 oil leak may develop from the distributor o-ring seal requiring replacement of the seal.
The distributor may develop internal faults. This can cause a rough running engine or stalling condition, the Check Engine Light may or may not illuminate. Our technicians tell us that the distribu...
Our technicians highly recommend that the transmission is serviced every 30,000 miles to avoid problems and maintain optimal operating order.
Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.
The electrical contacts in the ignition switch may fail and result in erratic instrument panel gauge operation or illumination of the Check Engine Light. A failed ignition switch will require repla...
The oxygen sensor can fail causing Check Engine Light illumination and the engine to run rich (burn more fuel than normal).
A coolant leak may develop from the water pump. This can result in an engine overheating condition. A leaking water pump will require replacement.
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...
The spark plug wire rubber boots may get soaked with oil, causing a misfire or rough idle.
The transmission output shaft seal may leak transmission fluid. On 2WD models, this leak can cause the transmission mount to become oil soaked, which will require replacement of the mount along w...
The alternator may fail, causing a "no charge" condition. An internal bearing may also fail and cause an abnormal noise. If the vehicle is driven too long with a failed bearing, the alternator may ...
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