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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1375 (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 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, engine OFF, verify with a scan tool the TFP Switch 4 parameter is Low.
  2. 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.
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