P1388 JEEP Variable Cam Timing Over Retarded Bank 2

P1388 JEEP Variable Cam Timing Over Retarded Bank 2

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).
Tech description
There is a factory service bulletin for the P1388 JEEP code on Jaguar model S type. The factory recommends reprogramming the Powertrain Control Module (PCM) to repair the problem.
Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
P1388 JEEP Description

The variable camshaft timing solenoid effects the inlet camshaft timing only. The actuator is a helical spline type, which is engine oil driven. It provides 50 degrees of rotation for camshaft adjustment under different types of engine torque and load conditions.

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.

JEEP Vehicle:JEEP Commander,JEEP Compass,JEEP Grand Cherokee,JEEP Liberty,JEEP Patriot,JEEP Wrangler,JEEP Wrangler Unlimited,

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