P1381 Chevrolet Variable Cam Timing Overadvanced (Bank #1)/ Misfire Detected – No Communication with BCM

P1381 Chevrolet Variable Cam Timing Overadvanced (Bank #1)/ Misfire Detected – No Communication with BCM

Possible causes
  • Cam timing improperly set.
  • No oil flow to the VCT piston chamber.
  • Low oil pressure.
  • VCT solenoid valve stuck closed.
  • Camshaft advance mechanism binding (VCT unit).
    • Symptoms
    – Engine Light ON (or Service Engine Soon Warning Light)
    P1381 Chevrolet Description

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