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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P2771) >> DTC P071A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove connector from the tow/haul switch. Using the J 35616  GM-approved terminal test kit, install a fused jumper wire from the tow/haul switch signal and ground circuits of the tow/haul switch connector.
    • If the scan tool Tow/Haul Mode indicates a status change, replace the switch.
  2. Using the DMM and the J 35616  , measure the voltage at the tow/haul switch signal circuit of the tow/haul switch connector.
    • If Ignition Voltage is measured, test the ground circuit of the tow/haul switch for an open or shorted condition.
  3. Using the DMM and the J 35616  , measure the voltage at the tow/haul switch signal circuit of the body control module (BCM).
    • If Ignition Voltage is measured, test the signal circuit of the tow/haul switch for an open or shorted condition.
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