P1619 - 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, 12:42 PM   #1
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To determine engine oil life remaining, PCM monitors ECT,
number of crankshaft revolutions, vehicle speed, and calculated oil
temperature. When PCM determines oil is at end of useful life, it will
send a signal through Serial Data Line (SDL) to illuminate CHANGE OIL
SOON indicator.

You likely won't notice any drivability problems.


  • Oil Life Monitor (OLM) reset circuit is grounded for greater
    than 60 seconds.

  • Check for faulty connections or damaged harness.
  • Replace OLM reset switch.
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