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PNP Switch Circuit Malfunction (MN5)

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the PNP switch for proper adjustment. Refer to Park/Neutral Position Switch Adjustment .
  2. Ignition OFF, disconnect the harness connector at the PNP switch.
  3. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Verify that the scan tool ECM PNP Switch parameter is In Gear.
    • If not the specified value, test the signal circuit terminal 12 for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Install a 3 A fused jumper wire between the signal circuit terminal 12 and the ground circuit terminal 1. Verify that the scan tool ECM PNP Switch parameter is Park/Neutral.
    • If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. If all circuits test normal, test or replace the PNP switch.
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