P03C2
Cylinder 5 Pressure Too Low
Cylinder 5 measured peak combustion pressure is below the calibrated minimum — typically low compression, weak injection, or stuck-open exhaust valve.
Cylinder 5 measured peak combustion pressure is below the calibrated minimum — typically low compression, weak injection, or stuck-open exhaust valve.
Common causes
- high
Low compression on cylinder 5
One of the most commonly reported causes for this code — check this first.
Typical part cost: $440-4400
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P03C2.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for P03C2.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P03C2.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does P03C2 mean?
P03C2 means "Cylinder 5 Pressure Too Low". It is a generic OBD-II code that points to a fault in the ignition system or misfire.
What are the most common causes of P03C2?
low compression on cylinder 5 — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code points to a problem that can cause damage or affect safety. Avoid driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full P03C2 diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.