P1381 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 09-27-2009, 12:13 PM   #1
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PCM detects engine misfire by detecting variations in
crankshaft deceleration between firing strokes. For accurate detection
of engine misfire, PCM must be able to distinguish between crankshaft
deceleration caused by actual misfire or deceleration caused by rough
road conditions.
Electronic Brake Control Module (EBCM) transmits rough road
information based on wheel acceleration/deceleration data supplied by
the wheel speed sensors. If ABS system detects rough road above a
predetermined threshold, information is sent to PCM through serial
data circuit.

You likely won't notice any drivability problems.


  • ABS system.

  • Check serial data circuit for open or faulty connection
    between EBCM and PCM.
  • Check for faulty connection at EBCM.
  • Check for faulty connections or damaged harness.
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