Cold start injector control wire shorted to ground or chafed against bodywork; Faulty cold start injector with an internal short or low coil resistance; Corroded, damaged or loose connector pins at the injector or control unit; Wiring harness damage from heat, vibration or previous repair work; Fault in the injector driver stage inside the engine control unit; Faulty relay, fuse or supply circuit feeding the injector, depending on the model.

P02FC

Cold Start Fuel Injection Control Circuit Low.

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)
FC: FaultThe specific fault in that area

What it means

P02FC means the engine control unit has found the control circuit for the cold start fuel injector (a dedicated injector or injection function used to enrich the mixture when the engine is cold) reading lower in voltage than expected. This usually points to a short to ground, a wiring fault or a failed driver or injector. The exact layout depends on the engine, as not all engines have a separate cold start injector.

Symptoms

Engine warning light on
Hard starting or long cranking when cold
Rough idle or hesitation on cold running
Poor cold-start emissions or smell of fuel
Possible misfire or stalling shortly after a cold start
Higher fuel consumption in cold weather

Possible causes

Cold start injector control wire shorted to ground or chafed against bodyworklikely
Faulty cold start injector with an internal short or low coil resistancelikely
Corroded, damaged or loose connector pins at the injector or control unitpossible
Wiring harness damage from heat, vibration or previous repair workpossible
Fault in the injector driver stage inside the engine control unitrare
Faulty relay, fuse or supply circuit feeding the injector, depending on the modelrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, especially coolant temperature and engine state when the fault set.
Check for related codes such as other injector circuit faults, fuel pressure or misfire codes, as these may point to a shared cause.
Look over the cold start injector wiring and connector for chafing, melted insulation, water ingress and corrosion.
Check the connector pins for tightness and signs of green or white corrosion.
With the ignition off and the connector unplugged, measure the injector coil resistance and compare it with the manufacturer's specification for that engine.
Check the control wire for a short to ground and continuity back to the control unit using the wiring diagram for the model.
With the connector unplugged and ignition on, check the supply voltage at the injector feed, as per the model's wiring diagram.
If wiring and injector test fine, check the driver output at the control unit and consider checking for software updates or known faults for that model.

How to fix

Repair or replace the damaged section of wiring and secure it clear of sharp edges and heat sources.
Clean or repair the connector terminals, or replace the connector if corroded or damaged.
Replace the cold start injector if its resistance or operation is out of specification.
Replace any faulty fuse or relay in the injector supply circuit.
Repair or replace the engine control unit only after wiring and injector faults are fully ruled out, and apply any official calibration update if one is known to cover this fault.

Can I keep driving?

Medium severity

The car can usually be driven for a short time, but cold starting and running may be poor and fuel consumption may rise. Get it diagnosed soon, and stop if it stalls, runs very rough or shows a strong smell of fuel.

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