P1362 - 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, 11:58 AM   #1
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Default P1362



Ignition Control Module (ICM) sends signals that the PCM
requires for fuel control and spark advance calculations. At the start
of engine crank, the ICM control spark advance (by-*** mode). When the
second 3X reference pulse is recognized by the PCM, PCM applies 5
volts to by-pass circuit, commanding ICM to switch spark advance to
PCM control (IC mode).
If PCM detects a short to voltage in by-*** circuit, DTC will
set. A short to ground in the IC circuit or by-pass circuit will cause
both DTCs P1361 and P1362 to set. Engine will start and run in by-pass
mode timing.

You likely won't notice any drivability problems.


  • PCM detects a short to voltage in by-pass circuit.
  • Locate and repair short in by-pass circuit.
  • Replace IC control module.
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