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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 359 (Automatic Transmission - 6T70 (M7U M7W) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P071A: Transmission Tow Mode Switch Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, transmission in Park, disconnect the I/P Multifunction Switch connector.
  2. Install a 3 amp fused jumper between the Tow/Haul Switch signal circuit harness connector terminal 11 and ground. Verify the scan tool parameter changes between Active and Inactive each time the signal circuit is grounded.
    • If not the specified value, test the signal circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. If all circuits test normal, replace the Tow/Haul switch.
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