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HOMESERVICE MANUALSCHEVROLET2012CHEVY EXPRESS G2500, VAN PASSENGER, 4.8L ENG VIN AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1854 (ENGINE MECHANICAL - 6.6L (LMM) - DIAGNOSTIC INFORMATION AND PROCEDURES)DIAGNOSTIC INFORMATION AND PROCEDURESENGINE OIL LEVEL SENSOR DIAGNOSISCIRCUIT/SYSTEM TESTING
2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN A

Circuit/System Testing

2012 Chevrolet Chevy Express G2500, Van Passenger, 4.8L Eng VIN ASECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 GMC Savana Special, 2010 GMC Savana Camper Special, 2010 GMC Savana, 2010 Chevrolet RV Cutaway, and 2010 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Verify proper engine oil level before continuing with diagnosis.
  1. Ignition OFF, disconnect the harness connector at the engine oil level sensor and/or switch.
  2. Ignition OFF, test for less than 2 Ξ© between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Engine Oil Level Switch parameter reads Low.
    • If the Engine Oil Level Switch parameter reads OK, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM.
    4. NOTE: If a short to voltage is found on the signal circuit, the fuse in the 3A jumper wire will open.
  4. Ignition ON, install a 3A fused jumper wire between the signal circuit terminal A and the ground circuit terminal B. Verify the scan tool Engine Oil Level Switch parameter reads OK.
    • If the Engine Oil Level Switch parameter reads Low, test the signal circuit terminal A for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the engine oil level sensor and/or switch.
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When to See a Mechanic

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.