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PNP Switch Malfunction (MW7 Allison)

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect the range selector lever cable for proper adjustment. Refer to Range Selector Lever Cable Adjustment .
  2. Ignition OFF. Disconnect the engine chassis harness to transmission internal harness connector X175.
  3. Verify that the scan tool PNP Switch parameter is In Gear.
    • If not the specified value, test the signal circuit terminal R for a short to ground. If the circuit tests normal, replace the ECM.
  4. Install a 3A fused jumper wire between the signal circuit terminal R and ground. Verify that the scan tool PNP Switch parameter is Park/Neutral.
    • If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the transmission internal mode switch.
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