Cylinder 10 injector sticking open or leaking at the seat; Contamination or deposits preventing the injector needle from seating; Damaged injector seals or O-rings allowing fuel to leak externally or into the cylinder area; Excessive fuel rail pressure from a faulty pressure regulator or pressure sensor fault; Wiring or connector fault or driver fault causing the injector to be held open; Misidentified cylinder with the real fault on a different injector or a different cause of the rich or misfire condition.

P02C1

Cylinder 10 - Injector Leaking.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
C1: FaultThe specific fault in that area

What it means

P02C1 is the generic code for a leaking fuel injector on cylinder 10. The engine control unit has judged that fuel is passing the injector when it should be closed, or that cylinder 10 is running richer than commanded. The exact monitoring method varies by engine and manufacturer, so it may use fuel trim, misfire, rail pressure decay or a combination of these.

Symptoms

Malfunction indicator lamp on
Hard or extended cranking after the car has been standing
Rough idle or a misfire on cylinder 10
Smell of unburnt fuel from the exhaust
Poor fuel economy
Possible fuel smell in the engine oil or oil level rising

Possible causes

Cylinder 10 injector sticking open or leaking at the seatlikely
Contamination or deposits preventing the injector needle from seatingpossible
Damaged injector seals or O-rings allowing fuel to leak externally or into the cylinder areapossible
Excessive fuel rail pressure from a faulty pressure regulator or pressure sensor faultpossible
Wiring or connector fault or driver fault causing the injector to be held openrare
Misidentified cylinder with the real fault on a different injector or a different cause of the rich or misfire conditionrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting fuel trims, engine temperature and load when the code set
Check for related codes such as misfire, fuel trim, rail pressure or injector circuit faults, and deal with those first
Visually inspect the cylinder 10 injector, its connector and wiring for damage, fuel leaks, heat damage or corrosion
Confirm the cylinder numbering for this engine and which injector is cylinder 10, as layouts differ between models
Check live data for fuel rail pressure behaviour after shutdown and compare with the manufacturer specification
Check engine oil for a raised level or a fuel smell
Carry out an injector leak-down or balance test as the engine specification allows and compare cylinder 10 with the others
Check the injector driver signal with a scope or the manufacturer's test method to rule out the injector being held open

How to fix

Replace the cylinder 10 injector if it is leaking or sticking, following the model-specific procedure
Replace injector seals and fit new O-rings where these are damaged
Repair or replace damaged wiring or connectors in the injector circuit
Correct a fuel pressure fault by replacing the faulty regulator or sensor as the diagnosis shows
Change the engine oil and filter if fuel dilution is confirmed, then clear the code and road test to confirm the repair

Can I keep driving?

High severity

Avoid driving the car until it is diagnosed, as a leaking injector can wash the cylinder walls, dilute the engine oil and overheat the catalytic converter. If it must be moved, keep it to a very short, gentle trip.

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