Cylinder 3 Contribution/Balance Fault
Cylinder 3 is not contributing to engine performance as expected.
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)
Inside the engine, each cylinder should produce a similar amount of power. If cylinder 3 is weaker, it affects the engine's overall performance and can cause rough running or misfires.
What the computer is actually seeing
The engine control module (ECM) monitors injector pulse width and cylinder pressure. If cylinder 3's contributions fall below a set threshold compared to the others, it triggers this code.
What a healthy reading looks like
Cylinder pressure should be within 10% of the average of all other cylinders; injector pulse width should be within 2-5 ms.
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 wiring and connector for the injector on cylinder 3 for damage or corrosion. Repair if necessary.
- 22. Perform a compression test on cylinder 3; values should be between 90-120 psi. If low, consider a mechanical issue.
- 33. Check injector operation by swapping the injector from cylinder 3 with the injector from another cylinder. Clear codes and see if the fault moves with the injector.
- 44. Measure fuel pressure; it should be around 50-60 psi with the engine running. Check the fuel filter and pump if low.
- 55. If all else passes, use a scanner to check for additional codes that may indicate a related issue.
Common causes
- Faulty fuel injector on cylinder 3
- Compression loss in cylinder 3
- Electrical issue in wiring to the injector
- Vacuum leak affecting cylinder 3
- Low fuel pressure from a failing pump
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not ideal; drivability may be affected, and you risk further engine damage.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it likely will return.
Why does this code pair with misfires?
A weak cylinder won't fire properly, causing the engine to misfire, which is detected by the ECM.
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