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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 P0815, P0816, or P0826 >> Circuit/System Verification

Circuit/System Verification

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 ON, Engine OFF, transmission in Park, verify with a scan tool the BCM Tap Up/Down Switch parameter displays On.
  2. Shift selector in the Manual (M) position, cycle the automatic transmission manual shift switch while observing the Tap Up/Down Switch parameter. The parameter should change from On to Up when the plus (+) switch is selected, and from On to Down when the minus (-) switch is selected.
  3. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
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