Possible causes

– Cam timing improperly set
– Continuous oil flow to the VCT piston chamber
– VCT solenoid valve stuck open
– Camshaft advance mechanism binding (VCT unit).

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1388 Description

The comprehensive component monitor (CCM) monitors the VCT position for over-retarded camshaft timing. The test fails when the camshaft timing exceeds a maximum calibrated value or remains in a retarded position.

P1388 Information for specific makes

P1388 DODGE
P1388 FORD
P1388 MAZDA
P1388 JEEP
P1388 CHRYSLER
P1388 JAGUAR