1998 Pontiac Bonneville Problems

RepairPal has identified the most common problems with the 1998 Pontiac Bonneville as reported by actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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21
Known Problems

The transmission pressure control solenoid may fail causing erratic shifting. Our technicians tell us that partial dis-assembly of the transmission is necessary to replace a failed pressure control solenoid.

The mass air flow or crankshaft position sensor may fail causing the engine to stall intermittently. Proper diagnoses will be necessary to determine the cause of any stalling condition.

The mode and temperature door actuators may fail causing improper air flow or temperature output from the heating and AC (HVAC) system.

The water pump may develop a coolant leak resulting in an engine overheating condition.

 

The intake manifold gaskets can develop external engine oil or coolant leaks. The intake manifold will need to be removed and the gaskets replaced to correct this issue. In some cases the plastic intake manifold my be damaged requiring replacement.

Problems with the anti-theft systems using the raised-chip key can prevent the car from starting. The wires in the steering column to the ignition lock cylinder tend to break. The the key and ignition lock cylinder must be replaced to correct this condition.

The EGR tube may develop an engine vacuum leak causing the engine to run lean. The Check Engine Light may or may not illuminate.

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

The outer tie rod ends on the steering linkage may wear causing excessive free play in the steering and uneven tire wear. If the worn tie rod ends are replaced, the wheel alignment should be checked and adjusted as necessary.

General Motors recommends that the spark plugs should be replaced every 100,000 miles. Our technicians highly recommend the spark plug wires be replaced at the same time.

The steering rack may fail causing a loss of power steering fluid as a result the steering may become hard to turn.

You may be able to prevent transmission problems by servicing the transmission and inspecting the fluid every 30,000 miles. If the fluid is dark or burned then the transmission system should be completely flushed.

Failure of the crankshaft position sensorignition control module, or powertrain control module (PCM) may cause the Check Engine Light to illuminate.

Extended life coolant may become contaminated and require cooling system service before the recommended 100,000 miles.
The ABS brake pressure modulator valve can fail internally causing the ABS light to illuminate.