P03A5
Cylinder 2 Pressure Too High
P03A5 is an OBD-II diagnostic trouble code meaning: Cylinder 2 Pressure Too High. Common causes: detonation due to low octane fuel, pre-ignition (glow ignition). Estimated repair cost: $56–889.
Symptoms
- Check Engine Light (often with power limitation)
- Detonation knocking noise when accelerating
- Engine overheating
- Sharp reduction in power
- Rough engine operation with metallic knocks
Causes
- Detonation due to low octane fuel
- Pre-ignition (glow ignition)
- Incorrect ignition timing
- Overheating of the engine or individual cylinder
- Cooling system or EGR malfunction
How to Fix
- Stop driving immediately if there are metallic knocks.
- Check the cooling system - coolant level and temperature
- Make sure you are using fuel with the correct octane rating
- Check the ignition timing and condition of the spark plugs
- Check the operation of the exhaust gas recirculation (EGR) system
- Contact a service station for in-depth engine diagnostics
Related codes
Error P03A5 by Vehicle Brand
FAQ
What does the P03A5 code mean?
P03A5 is an OBD-II diagnostic trouble code that indicates: Cylinder 2 Pressure Too High
What causes a P03A5 error code?
The most common causes of P03A5 include: Detonation due to low octane fuel; Pre-ignition (glow ignition); Incorrect ignition timing; Overheating of the engine or individual cylinder.
How do I fix a P03A5 diagnostic trouble code?
To fix P03A5: Stop driving immediately if there are metallic knocks.. Check the cooling system - coolant level and temperature. Make sure you are using fuel with the correct octane rating. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P03A5?
Do not drive — repair immediately
How much does it cost to fix P03A5?
The estimated repair cost for P03A5 is $56–889. Actual cost depends on your vehicle, location, and labor rates.
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