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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 783 (Engine Control System & Fuel System - 2.2L (L61) - DTC P0412 To DTC P2544) >> DTC P2120, P2122, P2123, P2125, P2127, P2128, or P2138 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. 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 voltage parameter. The reading should be between 0.13-4.87 volts and change with accelerator pedal input.
  2. Ignition ON, observe the scan tool APP sensor 2 voltage parameter. The reading should be between 0.13-4.87 volts and change with accelerator pedal input.
  3. Ignition ON, observe the scan tool APP Sensor 1 and 2 parameter. The scan tool should indicate agree.
  4. Clear the DTCs with the scan tool. Operate the vehicle within the Conditions for Running the DTC, or within the conditions that you observed from the Freeze Frame/Failure Records.
  5. Verify that DTC P2120 or P2125 are not the only accelerator pedal position DTCs set.
    • If DTC P2120 or P2125 are the only DTCs set, replace the ECM.
  6. Verify that DTCs P0641 or P0651 are set.
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