Problems for specific Cadillac Seville STS years:

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Newest reported 1991 Cadillac Seville STS problems

 

Verified for the Cadillac Seville STS

An ignition coil may fail causing one of the cylinders to misfire. Each of the two banks of cylinders has its own coil assembly. If one ignition coil fails the coil assembly for the corresponding cylinder bank must be replaced.

11 Reports
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Verified for the Cadillac Seville STS

The powertrain control module (PCM) can fail causing stalling, and various engine and transmission drivability concerns.

3 Reports
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Verified for the Cadillac Seville STS

An updated PROM (Programmable Read Only Memory) chip may be available for the powertrain control module (PCM). Check with your dealer.

3 Reports
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Verified for the Cadillac Seville STS

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.

4 Reports
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Verified for the Cadillac Seville STS

The alternator may fail causing the battery to go dead. The charge light on the dash may or may not illuminate. The alternator may also develop an abnormal noise. A failed alternator will require replacement.

4 Reports
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Verified for the Cadillac Seville STS

Excessive carbon build up in the engine combustion chambers may be the cause of a smog check failure due to excess NOx emissions. A "top engine" decoarbonization cleaning procedure will commonly correct this concern.

2 Reports
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Verified for the Cadillac Seville STS

One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.

60 Reports
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Verified for the Cadillac Seville STS

The trunk pull down switch may fail causing the trunk lid not to close completely. Our technicians tell us that the failed switch can be replaced without changing the complete pull down motor assembly.

31 Reports
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Verified for the Cadillac Seville STS

A coolant leak may develop from the water pump. This can result in an engine overheating condition. A leaking water pump will require replacement.

3 Reports
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Verified for the Cadillac Seville STS

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.

14 Reports
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Verified for the Cadillac Seville STS

The anti-lock brake system (ABS) control module may fail causing the ABS light to illuminate. Failed modules should be replaced to restore ABS operation.

33 Reports
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Verified for the Cadillac Seville STS

An automatic transmission fluid leak may develop from the rubber section of a transmission cooler line. In some cases the rubber section of hose can be replaced. In others, the complete cooler line must be replaced to correct this type of leak.

17 Reports
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Verified for the Cadillac Seville STS

Problems with 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 key and ignition lock cylinder should be replaced to correct this condition.

22 Reports
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Verified for the Cadillac Seville STS

The parking brake may not release automatically due to a failed vacuum switch or actuator. Our technicians tell us that if vacuum is supplied to the actuator when the transmission is in gear, the vacuum switch is functioning and replacing the actuator should correct this concern.

25 Reports
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Verified for the Cadillac Seville STS

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

15 Reports
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