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Oil Pressure Diagnosis And Testing

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools

For equivalent regional tools, refer to Special Tools .

  1. With the vehicle on a level surface, run the vehicle for a few minutes. Allow adequate drain down time, 2 - 3 minutes, and measure the oil level.
  2. If required, add the recommended grade engine oil and fill the crankcase until the oil level measures full on the oil level indicator.
  3. Run the engine briefly, 10 - 15 seconds, and verify low or no oil pressure on the vehicle gauge or light.
  4. Listen for a noisy valve train or a knocking noise.
  5. Inspect for the following conditions:
    • Oil diluted by water or glycol antifreeze

      Refer to Coolant in Engine Oil .

    • Foamy oil, which may be caused by a cut or damaged oil pump screen O-ring seal
    6. Fig 1: Oil Pressure Sensor
    GM2858286Courtesy of GENERAL MOTORS COMPANY
  6. Remove the oil pressure sensor (1).
    7. Fig 2: Engine Oil Pressure Gauge And Adapter
    GM2858287Courtesy of GENERAL MOTORS COMPANY
  7. Install the EN-21867-16  adapter (2) and EN-21867  pressure gauge (1), or equivalent.
  8. Run the engine until the engine reaches normal operating temperature and measure the engine oil pressure.
  9. Compare the readings to Engine Mechanical Specifications (RPO L96 VIN G) .
  10. If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:
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