1990 Cadillac Seville STS Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1990 Cadillac Seville STS

1990 Cadillac Seville STS Problems

Powertrain Control Module may Develop Fault

This powertrain control module (PCM) may develop a fault with its electrical ground location at the front of the engine block near the starter motor.

High Pressure Power Steering Hose Can Leak Fluid

The high-pressure power steering lines are known to leak.

Electrical Level Ride System May Fail

The electronic level ride system may not work properly; this may result in the rear of the vehicle riding too high or too low. Our technicians tell us that a height sensor or exhaust valve failure are common issues with this system. Proper diagnoses will be necessary to confirm the exact fault.

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