Problems for specific Cadillac DeVille years:
Problem Reports
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1990 Cadillac DeVille Problems
Powertrain Control Module (PCM) Can Fail Affecting Drivability
The powertrain control module (PCM) can fail causing stalling, and various engine and transmission drivability concerns.
Updated PROM Chip Available for Powertrain Control Module
An updated PROM (Programmable Read Only Memory) chip may be available for the powertrain control module (PCM). Check with your dealer.
Powertrain Control Module Electrical Ground 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.
Noise and/or Dead Battery Due to failed Alternator
The alternator may fail causing the battery to go dead, or an abnormal noise may develop. The dash warning light may or may not illuminate. A failed alternator will require replacement.
Coolant Leak & Engine Overheating
A coolant leak may develop from the water pump. The engine may overheat as a result of the coolant loss. A leaking water pump should be replaced.
Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator
One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored in the HVAC control module should be available to assist with diagnoses.
Trunk Lid Won't Close Due to Trunk Pull Down Switch 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 assembly.
Electronic 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.
ABS Light Due to Control Module Failure
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.
Transmission Fluid Leak From Cooler Line
The rubber section of an automatic transmission cooler line may develop a fluid leak . In some cases the leaking section of hose can be replaced. In others, the complete cooler line must be replaced to correct this concern.
Car Won't Start and Security Light is On
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 Parking Brake May Not Automatically Release
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.
High Pressure Power Steering Hose Can Leak Fluid
The high-pressure power steering lines are known to leak.
Check Engine Light due to EGR control solenoid/valve failure
The EGR control solenoid or EGR valve may fail causing the Check Engine Light to illuminate.
Air conditioning compressor may leak or become noisy
The air conditioning compressor may become noisy or develop a refrigeration leak, requiring replacement.
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