1990 Cadillac Seville STS Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1990 Cadillac Seville STS
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1990 Cadillac Seville STS ProblemsPowertrain 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.
The high-pressure power steering lines are known to leak.
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.