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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1733 (Automatic Transmission - 6L45/6L50/6L80/6L90 - DTC P0218 To DTC P0974) >> DTC P0815, P0816, P0826, or P1876 >> 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 automatic transmission shift lever harness connector.
  2. Ignition ON, verify with a scan tool the Tap Up/Down Switch parameter displays OFF in the Chassis Data list under BCM.
  3. Ignition ON, test for greater than 11 volts between the ignition voltage circuit terminal 4 and ground at the battery negative post.
    • 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 6.6-7.0 K ohms between terminal 3 and terminal 4 on the automatic transmission shift lever harness connector. Also, test for 3.7-4.2 K ohms when pressing the minus (-) switch and 1.7-2.0 K ohms when selecting the plus (+) switch.
    • If not within the specified values, replace the automatic transmission shift lever.
  5. Test the signal circuit between the BCM and the automatic transmission manual shift switch for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
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