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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 09-27-2009, 01:00 PM   #1
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Default P1635



PCM uses 5-volt reference "A" circuit as a sensor feed for
EGR valve pintle position, fuel tank pressure (VIN K), MAP, and TP
sensors. PCM monitors voltage on this circuit. If PCM senses voltage
out of tolerance, DTC P1635 sets.

You likely won't notice any drivability problems.


  • PCM detects an out of tolerance condition on the 5-volt
    reference "A".

  • Check for faulty connections or damaged harness, MAP, MAF, TPS, etc
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