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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 938 (Automatic Transmission - ALLISON - DTC P0733 To DTC P0873) >> DTC P0851 or P0852 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, transmission in Park or Neutral, disconnect the transmission 20-way connector.
  2. Test for less than 1 ohm of resistance between the Park/Neutral signal circuit terminal R on the transmission side and ground.
    • If greater than the specified range, test the signal circuit between the connector and the IMS for an open/high resistance. If the circuit tests normal, replace the IMS.
  3. Ignition On, verify the Park/Neutral parameter displays In-gear.
    • If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
  4. Install a fused jumper between the signal circuit and ground. Verify the Park/Neutral parameter displays Park/Neutral.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
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