highModerate 1–2 hours (shop) Community experience4,002 views
Source: Widely reported by owners. Not a GM statement. Confirm with a qualified technician.
When to stop driving
Stop the engine immediately if the gauge reads zero or a low oil pressure warning appears, until you confirm real pressure with a mechanical gauge. Running with no oil pressure can destroy the engine in seconds.
Symptoms
- Oil pressure gauge reads zero with the engine running
- Gauge jumps around or pegs high
- Low oil pressure warning
- Oil leak near the sender
Likely causes
- Failed oil pressure sender
- Damaged connector or wiring
- Actual low oil level or low pressure
What to check
Diagnostic steps, in order. Stop if any step needs tools or skills you don't have.
- 1Turn the engine off and check the oil level right away.
- 2Listen for new knocking or ticking noises. If present, don't run the engine.
- 3Have a shop connect a mechanical oil pressure gauge to confirm real pressure.
- 4If mechanical pressure is normal, replace the sender and inspect its connector.
Possible solutions
- Replace the oil pressure sender
- Repair the connector or wiring
- If real pressure is low, diagnose the engine before driving
Parts commonly needed
- Oil pressure sender
- Engine oil
- Connector or pigtail (if damaged)
Warning signs
- Gauge that flickers
- Oil leak near the back of the engine
- Readings that change when you tap the dash or hit bumps
Prevention
- Use a quality replacement sender
- Keep oil level correct
- Check oil regularly
Information here combines factory data and owner experience and may not apply to your exact car. For brakes, steering, suspension, fuel or anything safety-critical, consult a qualified mechanic. Read the full disclaimer.
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