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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 12 (HYBRID ENGINE CONTROLS - DTC P181C TO DTC P2797)DTC P1AC6 OR P1AC7CIRCUIT/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 is about a different variant/trim than selected.

Attempt to crank and start the engine. Perform the appropriate diagnostic procedure as necessary.

Diagnosis if the Engine Does NOT Start

  1. Ignition OFF, disconnect the CKP sensor connector.
  2. Ignition ON, test for 4.8-5.2 volts on the CKP signal circuit, from the CKP connector terminal A and ground.
    • If within the specified range, reconnect the CKP connector and perform ECM DTC P0335 diagnostic procedure.
  3. Ignition OFF, disconnect PIM connector X1.
  4. Ignition ON, test for 4.8-5.2 volts on the CKP signal circuit, from the CKP sensor connector terminal A and ground.
    • If within the specified range, replace the drive motor generator power inverter control module (PIM).
  5. Test the CKP signal circuit between CKP connector terminal A and PIM connector X1 terminal 26 for a short to ground if less than the specified value or a short to voltage if greater than the specified value.
    • If the circuit tests normal, reconnect all connectors and perform ECM DTC P0335 diagnostic procedure.

Diagnosis if the Engine Starts

    NOTE: Diagnose ECM DTCs P0335 and P0336 prior to performing this procedure.
  1. Ignition OFF, disconnect PIM connector X1 and the CKP sensor connector.
  2. Test for less than 5 ohms on the CKP low reference circuit, from connector X1 terminal 35 and ground.
    • If greater than the specified value, repair the low reference circuit for an open/high resistance.
  3. Ignition ON, test for 4.8-5.2 volts on the CKP signal circuit, from the connector X1 terminal 26 and ground.
    • If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the drive motor generator power inverter control module (PIM).
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When to See a Mechanic

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.