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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 292 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 5.3L, 6.0L, 6.2L - DTC P0010 TO DTC P0231/P025A)DTC P0230 (WITHOUT LY6)CIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C

Circuit/System Testing

2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2010 GMC Yukon XL, 2010 GMC Yukon, 2010 Chevrolet Tahoe, 2010 Chevrolet Suburban, and 2010 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the ignition OFF, disconnect the harness connector at the FPCM.
  2. With the ignition ON, engine OFF, probe the control circuit of the fuel pump control module terminal 13 with a test lamp that is connected to a good ground. Command the fuel pump ON and OFF with a scan tool. The test lamp should turn ON and OFF with each command.
    • If the test lamp does not turn ON and OFF, test for an open, high resistance, or a short to ground in the fuel pump control circuit, an intermittent or a poor connection at the ECM. If the circuit tests normal, replace the ECM.
    • If the test lamp remains illuminated with each command, test for a short to voltage in the control circuit of the fuel pump control module or an intermittent or a poor connection at the ECM. If the circuit tests normal, replace the ECM.
  3. If all circuits test normal, replace the FPCM.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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