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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1370 (Automatic Transmission - 4L60-E - DTC P0218 To DTC P2771) >> DTC P0973 or P0974 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the AT inline 20-way connector at the transmission.
  2. Install the J 44152  jumper harness (20 pins), on the transmission side of the AT inline 20-way connector. See Special Tools .
  3. Test for 19-31 ohms of resistance between the control terminal A and the ignition terminal L of the transmission.
    • If not within the specified range, test the circuits for a short to ground or an open/high resistance. If a circuit is shorted or open replace the internal transmission harness, if the circuits test normal, replace the 1-2 shift solenoid.
  4. Test for infinite resistance between each terminal and the transmission housing/case.
    • If not the specified value, test the circuits for a short to ground or an open/high resistance. If a circuit is shorted replace the internal transmission harness, if the circuits test normal, replace the 1-2 shift solenoid.
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