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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 942 (Engine Controls And Fuel - 6.6L (LMM) - DTC P154B To DTC P2693) >> DTC P2122, P2123, P2127, P2128, or P2138 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool APP Sensor 1 parameter for a normal voltage range between 0.80-4.75 volts.
  2. Ignition ON, observe the scan tool APP Sensor 2 parameter for a normal voltage range between 0.30-2.50 volts.
  3. Ignition ON, compare the scan tool APP Sensor 1 and APP Sensor 2 parameters. Verify they do not differ more than 2 percent during a full pedal sweep.
  4. Engine running, observe the DTC information with a scan tool. DTCs P2122, P2123, P2127, P2128 or P2138 should not set.
  5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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