Clogged or restricted cylinder 3 fuel injector, reducing flow below the ECM's correction range; Fuel injector electrical connector corrosion or poor terminal tension at cylinder 3; Internal injector wear or failure causing an abnormal flow characteristic; Low fuel pressure or a restricted fuel supply that affects one injector more than others; Contaminated fuel or fuel system deposits altering injector spray patterns; ECM software calibration issue or a fault in the injector driver circuit for cylinder 3; Mechanical issue such as low compression on cylinder 3 that the ECM misinterprets as an injector offset problem

DTC codes / P2Cxx · Hybrid propulsion / P2C57

P2C57Cylinder 3 Fuel Injector B Offset Learning At Max Limit

Q: What does code P2C57 mean?

Cylinder 3 Fuel Injector B Offset Learning At Max Limit. P2C57 means the engine control module (ECM) has learned a fuel injector correction value for cylinder 3 that has hit its maximum allowed limit, so it can no longer compensate for the injector's flow error. The ECM stores this code when the injector offset learning value for cylinder 3 stays pegged at the top of its range during the learning routine.

P2C57 means the engine control module (ECM) has learned a fuel injector correction value for cylinder 3 that has hit its maximum allowed limit, so it can no longer compensate for the injector's flow error. The ECM stores this code when the injector offset learning value for cylinder 3 stays pegged at the top of its range during the learning routine.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Rough idle or a slight misfire felt at idle and low engine speeds
Reduced fuel economy as the ECM struggles to balance cylinder 3
Hesitation or stumble during light acceleration
In some cases, a pending misfire code for cylinder 3 stored alongside P2C57

Common causes, most likely first

Clogged or restricted cylinder 3 fuel injector, reducing flow below the ECM's correction range
Fuel injector electrical connector corrosion or poor terminal tension at cylinder 3
Internal injector wear or failure causing an abnormal flow characteristic
Low fuel pressure or a restricted fuel supply that affects one injector more than others
Contaminated fuel or fuel system deposits altering injector spray patterns
ECM software calibration issue or a fault in the injector driver circuit for cylinder 3
Mechanical issue such as low compression on cylinder 3 that the ECM misinterprets as an injector offset problem

How to diagnose and fix it

Scan all modules and record freeze-frame data for P2C57 and any companion misfire or fuel trim codes
Inspect the cylinder 3 injector connector and harness for corrosion, chafing, or loose terminals
Measure fuel pressure and compare it to specification to rule out a supply-side restriction
Perform an injector balance or cylinder contribution test to compare cylinder 3 flow against the others
Run the manufacturer's injector offset learning reset and relearn procedure after any repair
Replace the cylinder 3 fuel injector if flow testing confirms it is out of range, then clear codes and verify learning completes
If the code returns after injector replacement, check compression and valve operation on cylinder 3 before condemning the ECM

What the offset learning limit really means

The offset learning value is a correction the ECM applies to the injector pulse width, so hitting the max limit means the ECM has run out of adjustment rather than that the injector has failed outright.
A dirty or partially clogged injector is the most common cause, and professional cleaning sometimes restores flow enough to bring the learned value back into range without replacement.
Technicians who replace the injector without resetting and relearning the offset values often see the code return immediately because the ECM is still working from the old learned data.
Low compression or a valve problem on cylinder 3 can mimic an injector offset fault, so a compression test belongs in the diagnostic path before parts are thrown at the car.
This code can set intermittently and clear itself after a few drive cycles, which tempts drivers to ignore it, but the underlying flow error usually worsens over time.

Can I keep driving with P2C57?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration and towing because a lean-running cylinder can overheat and damage components. If the check engine light starts flashing or you feel a strong misfire, stop driving and have the vehicle towed.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.