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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1737 (Automatic Transmission - ALLISON - DTC P0218 To DTC P0878) >> DTC P0712 or P0713 >> 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, disconnect the X175 harness connector at the transmission.
  2. Ignition ON, engine OFF, connect a 3A fused jumper wire between the TFT signal circuit terminal pin G and the TFT low reference circuit terminal H. Verify with a scan tool that the Trans. Fluid Temp. parameter changes from -40°C (-40°F) to 160°C (320°F) when the jumper is installed.
    • If not the specified value, test the TFT sensor signal and low reference circuits for a short to voltage, short to ground or an open/high resistance. If circuits test normal, replace the TCM.
  3. Ignition OFF, remove the transmission oil pan. Refer to Oil Pan Replacement .
  4. Test the transmission internal harness TFT signal and low reference circuits for a short to voltage, short to ground or an open/high resistance.
    • If circuits test normal, test or replace the pressure switch manifold, with thermistor.
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