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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1699 (Automatic Transmission - 4T45-E - DTC P0218 To DTC P0961) >> DTC P0851 or P0852 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the transmission range switch.
  2. Ignition ON, verify the scan tool ECM Park/Neutral switch parameter displays In-Gear.
    • If not the specified value, test the park/neutral signal circuit terminal 12 for a short to ground. If the circuit tests normal, replace the ECM.
  3. Install a 3A fused jumper wire between the park/neutral signal circuit terminal 12 and ground. Verify the scan tool ECM Park/Neutral switch parameter displays Park/Neutral.
    • If not the specified value, test the park/neutral signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
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