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1991 Cadillac Seville STS Problems

Find the most common issues based on 1991 Cadillac Seville STS owner complaints.
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Most Common 1991 Cadillac Seville STS Problems

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 i...
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 loc...
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 ass...
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2 Known 1991 Cadillac Seville STS Brakes Problems

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.
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...

2 Known 1991 Cadillac Seville STS Drive Train Problems

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 ...
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 com...

1 Known 1991 Cadillac Seville STS Electrical & Lights Problem

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 loc...

7 Known 1991 Cadillac Seville STS Engine Problems

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.
Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.
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 r...

4 Known 1991 Cadillac Seville STS Exhaust & Emissions Problems

The powertrain control module (PCM) can fail causing stalling, and various engine and transmission drivability concerns.
The EGR control solenoid or EGR valve may fail causing the Check Engine Light to illuminate.
An updated PROM (Programmable Read Only Memory) chip may be available for the powertrain control module (PCM). Check with your dealer.

2 Known 1991 Cadillac Seville STS Heating & Air Conditioning Problems

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 i...
The air conditioning compressor may become noisy or develop a refrigeration leak, requiring replacement.

1 Known 1991 Cadillac Seville STS Maintenance Problem

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

1 Known 1991 Cadillac Seville STS Miscellaneous Problem

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 ass...

2 Known 1991 Cadillac Seville STS Suspension & Steering Problems

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 ...

22
Known 1991 Cadillac Seville STS Problems & Complaints

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.
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 i...
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 loc...
Fuel injectors can short-circuit electrically causing a rougher than normal idle and reduced performance.
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 r...
Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.
The EGR control solenoid or EGR valve may fail causing the Check Engine Light to illuminate.
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 ...
A coolant leak may develop from the water pump. This can result in an engine overheating condition. A leaking water pump will require replacement.
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 com...
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 ...
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 ass...
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 spark plugs should be replaced every 30,000 miles and the spark plug boots should be checked for hot spots and cracks.
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