DTC U1066 Cadillac
Idle Control System Performance
Idle Control System Performance
Description
Engine started, and the PCM detected that the Actual idle speed varied greatly from the Desired idle speed. The IAC System test observes the engine speed to check the operation of the IAC valve. The PCM controls engine idle speed with the idle air control
Cause and Solution
Throttle valve is dirty or sticking (it may need to be cleaned)ISC motor is damaged or has failedPCM has failed
Video Guide
Diagnostic Info
- DTC Code: U1066
- Brand: Cadillac