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Home >> Buick >> 2015 >> Verano Premium, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Engine Mechanical - 2.0L (LHU) >> Diagnostic Information and Procedures >> Oil Pressure Diagnosis and Testing

Oil Pressure Diagnosis and Testing

  1. With the vehicle on a level surface, allow adequate drain down time of 2-3 minutes and measure for a low oil level.
  2. 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, 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:
    • Correct oil filter with anti-drain back feature and O-ring on the cylinder block side of the filter
    • Oil diluted by moisture or unburned fuel mixtures
    • Improper oil viscosity for the expected temperature
    • Incorrect or malfunctioning oil pressure sender
    • Incorrect or malfunctioning oil pressure gauge
    • Plugged oil filter
    • Malfunctioning oil bypass valve
  6. Remove the oil pressure sender or another engine block oil gallery plug.
  7. Install an oil pressure gauge and measure the engine oil pressure.
  8. Compare the readings to the specifications. Refer to Engine Mechanical Specifications .
  9. If the engine oil pressure is below specifications, inspect the engine for 1 or more of the following conditions:
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