Engine Protection Active - Crankcase Pressure
Crankcase pressure is too high, indicating possible internal engine issues.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The engine computer is detecting that the pressure inside the engine's crankcase is higher than normal, which can lead to serious engine damage if not addressed.
What the computer is actually seeing
The engine control module (ECM) measures crankcase pressure with a sensor and triggers this code when pressure exceeds a predetermined threshold, usually around 3-5 PSI at idle.
What a healthy reading looks like
Normal crankcase pressure typically ranges from 0 to 2 PSI. It should remain stable under normal operating conditions.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the PCV valve and hoses for blockages or damage. Replace if necessary. Decision: If PCV is clear, go to step 2.
- 22. Check oil level. Ensure it is within the normal range. Decision: If oil level is fine, go to step 3.
- 33. Use a pressure gauge to measure crankcase pressure at idle. Decision: If pressure is above expected values, go to step 4.
- 44. Inspect piston rings and perform a compression test on cylinders. Decision: If compression is low, further engine disassembly may be needed.
Common causes
- Blocked positive crankcase ventilation (PCV) valve
- Worn piston rings causing excessive blow-by
- Engine oil overfilled
- Faulty crankcase pressure sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, driving with high crankcase pressure can lead to severe engine damage.
Will this code come back?
If the underlying issue isn't fixed, the code will likely return.
Why does this code sometimes pair with other SPN codes?
High crankcase pressure can indicate multiple issues, impacting other systems.
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