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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. If DTCs P0722 or P0723 are set, diagnose those DTCs first.
  2. Observe the TCM output speed signal parameters and the ECM speed signal parameters with a scan tool, while driving the vehicle. Both parameter values should be identical.
  3. 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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