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HOMESERVICE MANUALSCHEVROLET2013SILVERADO 1500 HYBRID, RWDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS/FUEL - HYBRID (HP2) 6.0L (LZ1) - DTC P0420 TO DTC P3449 AND DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC INFORMATION AND PROCEDURESDTC P2635 (FUEL PUMP CONTROL MODULE)CIRCUIT/SYSTEM TESTING
2013 Chevrolet Silverado 1500 Hybrid, RWD

Circuit/System Testing

2013 Chevrolet Silverado 1500 Hybrid, RWDSECTION Circuit/System Testing
NOTE:

Do not replace the fuel pump control module based on a history DTC P2635. The DTC P2635 may be stored but that does not indicate a failure of the fuel pump control module. Refer to Strategy Based Diagnosis for further history DTC diagnostics.

  1. Verify that DTCs P018B, P018C, P018D, P0231, P0232, or P023F are not set.
  2. Perform the Fuel System DiagnosisΒ  to verify proper fuel pressure.
    • If the fuel pressure is not normal, replace the fuel pump.
  3. Ignition OFF, disconnect the harness connector at the fuel tank pump module.
  4. Ignition ON, test for less than 5.0 Ξ© between the fuel pump module low reference circuit terminal A and ground.
    • If greater than the specified range, test the fuel pump module low reference circuit for a high resistance. If the circuit tests normal, replace the fuel pump control module.
  5. Ignition OFF, install a test lamp between the control circuit terminal D and the control circuit terminal A.
  6. Ignition ON, command the fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the fuel pump control module.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the fuel pump control module.
  7. If all circuits test normal, replace the fuel pump control module.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.