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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 P0877 or P0878 >> 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. Perform the Transmission Fluid Level and Condition Check to verify correct fluid level and condition.
  2. Ignition ON, engine OFF, verify with a scan tool the TFP Switch 4 parameter is Low.
  3. Engine running, verify with a scan tool the TFP Switch 4 parameter is Low with selector in reverse and High with selector in all other positions.
  4. Ignition ON, engine OFF, move the shift selector lever through all the ranges. With a scan tool, verify the TR Sw. A/B/C/P parameters match the IMS A, B, C, and P circuit states in the transmission IMS logic table. Refer to Transmission Internal Mode Switch Logic .
    • If not the expected results, refer to DTC P0708 .
  5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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