P01CF

What it means

P01CF is the generic code for cylinder 3 injection timing performance being over retarded. The engine control unit has compared the actual start of injection for cylinder 3 with the commanded timing and found it later than the allowed limit. This is mostly seen on diesel engines, or direct injection engines where injection timing is monitored, and the exact monitoring method depends on the engine.

Symptoms

• Engine management light on
• Rough idle or misfire felt on one cylinder
• Hard starting or extended cranking
• Loss of power or poor throttle response
• Excess diesel knock or harsh combustion noise
• Increased smoke or fuel smell from the exhaust

Possible causes

• Faulty or sticking cylinder 3 injector, or an injector that is slow to openlikely
• Damaged wiring, poor connector contact or high resistance in the cylinder 3 injector circuitlikely
• Low or unstable fuel rail pressure due to a weak pump, restricted filter or leaking pressure control componentspossible
• Poor quality, contaminated or incorrect fuelpossible
• Crankshaft or camshaft position sensor fault, or a reference signal problem upsetting timing calculationspossible
• Mechanical timing fault such as a stretched or incorrectly fitted timing chain or belt, depending on enginerare
• Outdated or faulty control unit software or calibration, where the manufacturer has documented it for the enginerare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, noting engine load, speed, temperature and rail pressure when the fault set.
2. Check for related codes such as other injector, rail pressure, misfire or sensor faults, and deal with those first as they may be the root cause.
3. Inspect the cylinder 3 injector wiring and connector for chafing, corrosion, oil ingress and loose pins.
4. Check the fuel filter condition and fuel quality, and look for water or contamination.
5. Compare live data for injector correction values, misfire counts and rail pressure (actual versus requested) across all cylinders.
6. Check crankshaft and camshaft sensor signals and their wiring for correct readings and a clean waveform.
7. Test the cylinder 3 injector electrically and check its operation or leak-off as the manufacturer's procedure specifies for the engine.
8. Check mechanical timing and compression if electrical and fuel checks are clear, following the engine-specific procedure.

How to fix

• Repair or replace damaged wiring or connectors in the cylinder 3 injector circuit.
• Replace the cylinder 3 injector if testing shows it is faulty, and code or adapt it as the manufacturer requires.
• Replace the fuel filter and correct fuel supply or rail pressure faults found during testing.
• Drain and replace contaminated fuel, then clear the fault and confirm it does not return.
• Replace a faulty crankshaft or camshaft position sensor, or correct mechanical timing faults.
• Apply a manufacturer-approved software update only if an outdated calibration is confirmed as a cause for the engine.

Can I keep driving?

Nearby codes

• P01CEGenericCylinder 2 Injection Timing Performance - Over Advanced
• P01D0GenericCylinder 3 Injection Timing Performance - Over Advanced