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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1739 (Automatic Transmission - ALLISON - DTC P0218 To DTC P0878) >> DTC P071A >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, transmission in Park, disconnect the automatic transmission shift lever harness connector.
  2. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes, test for less than 5 ohms between the ground circuit terminal 2 and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for greater than 11 V between the tow/haul signal circuit terminal 1 and ground.
    • If less than the specified value, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition OFF, test for less than 3 ohms between terminal 1 and terminal 2 on the automatic transmission shift lever component harness connector while depressing the Tow/Haul switch button, and an open circuit when the Tow/Haul switch button is released.
    • If not the expected results, replace the automatic transmission shift lever.
  5. If all circuits test normal, replace the BCM.
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