Faulty fuel injector for cylinder 3, such as a sticking or clogged nozzle; Wiring harness damage or poor electrical connection at the cylinder 3 injector; Failed injection timing control solenoid or actuator (if equipped); Engine control module software calibration issue or internal fault; Low fuel pressure or contaminated fuel affecting injector response; Mechanical wear in the injection pump or timing components (on engines with mechanical injection)

DTC codes / P01xx · Fuel and air metering / P01CF

P01CFCylinder 3 Injection Timing Performance - Over Retarded

Q: What does code P01CF mean?

Cylinder 3 Injection Timing Performance - Over Retarded. P01CF indicates that the engine control module has detected the fuel injection timing for cylinder 3 is more retarded than the manufacturer's specified limit during operation. The computer monitors the injection event timing and sets this code when the actual timing falls outside the acceptable window for too long.

P01CF indicates that the engine control module has detected the fuel injection timing for cylinder 3 is more retarded than the manufacturer's specified limit during operation. The computer monitors the injection event timing and sets this code when the actual timing falls outside the acceptable window for too long.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaFuel and air metering

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Rough idle or misfire sensation, especially when the engine is cold
Reduced engine performance or hesitation during acceleration
Increased fuel consumption due to inefficient combustion
Occasional engine stumble or surge at steady speeds

Common causes, most likely first

Faulty fuel injector for cylinder 3, such as a sticking or clogged nozzle
Wiring harness damage or poor electrical connection at the cylinder 3 injector
Failed injection timing control solenoid or actuator (if equipped)
Engine control module software calibration issue or internal fault
Low fuel pressure or contaminated fuel affecting injector response
Mechanical wear in the injection pump or timing components (on engines with mechanical injection)

How to diagnose and fix it

Connect a scan tool and verify P01CF is current, then check for related codes and freeze-frame data
Inspect the cylinder 3 injector electrical connector and harness for corrosion, chafing, or loose pins
Perform a fuel injector balance test or cylinder contribution test to compare cylinder 3 with others
Check fuel pressure and quality; test for restrictions or contamination in the fuel system
Swap the cylinder 3 injector with a known-good injector from another cylinder to see if the code follows
If the code persists, test the injection timing control circuit and actuator with a multimeter or oscilloscope
Reflash or replace the engine control module only after all other possibilities are ruled out

When cylinder 3 timing is not the real culprit

A dirty or failing fuel injector on cylinder 3 is the most common cause, but technicians often overlook a weak fuel pump or clogged filter that affects all cylinders and triggers the code on the weakest one first.
The code can be set by a momentary electrical glitch in the injector circuit that does not repeat during a test drive, so always check for intermittent connection issues before replacing parts.
On some engines, a worn timing chain or belt can cause injection timing to retard, and the code may appear alongside camshaft or crankshaft correlation codes.
Replacing the injector without checking the injection timing control solenoid or actuator can lead to a repeat repair if the actuator is the actual fault.
A software calibration issue in the engine control module can cause false P01CF settings, so check for technical service bulletins before condemning hardware.

Can I keep driving with P01CF?

You can usually drive the vehicle with P01CF, but avoid heavy acceleration or towing until the fault is diagnosed, as prolonged driving with incorrect injection timing can damage the catalytic converter or cause engine misfire.

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.