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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 09-26-2009, 02:48 PM   #1
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Ignition Control Module (ICM) sends signals that PCM requires
for fuel control and spark advance calculations. At start of engine
crank, ICM controls spark advance (by-pass mode). When second 3X
signal is recognized by PCM, it applies 5 volts to by-pass circuit,
commanding ICM to switch Ignition Control (IC) of spark advance to PCM
(IC mode). An open in IC circuit, or a short to voltage in by-pass
circuit will set DTC 1351.

You likely won't notice any drivability problems.


  • PCM detects open circuit in by-pass circuit.
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