P2C59

Cylinder 4 Fuel Injector B Offset Learning At Max Limit

Moderate severity

The injector offset adaptation for fuel injector B on cylinder 4 has reached the maximum learning limit. Injector flow trends above nominal beyond compensation.

Common causes

Injector leaking - increased flow
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $220-1650
Local rail pressure drift high
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $220-1650
See all causes + fix costs
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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.

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Related codes

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Frequently asked questions

What does P2C59 mean?

P2C59 means "Cylinder 4 Fuel Injector B Offset Learning At Max Limit". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.

What are the most common causes of P2C59?

injector leaking - increased flow; local rail pressure drift high — 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?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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