Cylinder 1 injector worn, leaking or delivering more fuel than commanded; Carbon deposits or contamination affecting injector spray pattern or flow; Wiring or connector fault on the cylinder 1 injector circuit (high resistance, poor pin tension, corrosion); Fuel pressure too high or irregular (regulator, pressure sensor or pump control fault, depending on system); Mechanical fault on cylinder 1 such as low compression or inlet air leak altering the fuel correction; Outdated or faulty ECU software or a learned value that was not reset after injector work.

P02CC

Cylinder 1 Fuel Injector A Offset Learning At Min Limit.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
CC: FaultThe specific fault in that area

What it means

P02CC means the engine control unit has been learning a fuel injector offset correction for cylinder 1 (injector A) and the learned value has reached its minimum limit. The ECU adapts injector timing or quantity to keep delivery accurate, and it can no longer trim any further in that direction. This usually points to cylinder 1 injector delivering more fuel than commanded, or a related fault pushing the correction to its limit.

Symptoms

Engine management light on
Rough idle or uneven running, mainly on cylinder 1
Hesitation or poor throttle response
Slightly higher fuel consumption
Black smoke or a strong fuel smell from the exhaust
Possible misfire codes stored alongside

Possible causes

Cylinder 1 injector worn, leaking or delivering more fuel than commandedlikely
Carbon deposits or contamination affecting injector spray pattern or flowpossible
Wiring or connector fault on the cylinder 1 injector circuit (high resistance, poor pin tension, corrosion)possible
Fuel pressure too high or irregular (regulator, pressure sensor or pump control fault, depending on system)possible
Mechanical fault on cylinder 1 such as low compression or inlet air leak altering the fuel correctionrare
Outdated or faulty ECU software or a learned value that was not reset after injector workrare

How to diagnose

Read all stored and pending codes and note the freeze frame data (load, engine temperature, fuel trims) from when P02CC set
Look for related codes such as misfires, fuel pressure, injector circuit or fuel trim faults, and address those first
Inspect the cylinder 1 injector connector and wiring for damage, corrosion, chafing and poor pin fit
Check live data for fuel trims, injector correction values for each cylinder and compare cylinder 1 with the others
Measure fuel pressure against the manufacturer specification at idle and under load (method varies by engine and fuel system)
Check for inlet air leaks and inspect the spark plug for cylinder 1 for signs of running rich
Test injector electrical resistance and perform an injector balance or leak-down test as the manufacturer procedure allows
Check for manufacturer software updates or technical bulletins relating to injector learning for the specific model and engine

How to fix

Replace the cylinder 1 injector if it is leaking or out of tolerance, and perform any injector coding or adaptation reset the manufacturer requires
Clean or service the injector only if the manufacturer permits it and the fault is deposit related
Repair or replace damaged wiring or connectors on the injector circuit
Correct fuel pressure faults by repairing the regulator, sensor or pump control component identified
Fix any inlet leak or mechanical fault found on cylinder 1
Update the ECU software if a known calibration fault applies, then clear the code and confirm it does not return

Can I keep driving?

Medium severity

The car can usually be driven short distances, but book it in soon. A leaking or overfuelling injector can wash oil from the bore, foul plugs and overload the catalytic converter if left.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.