Faulty fuel injector for cylinder 10, such as a sticking or leaking nozzle; Wiring harness damage or poor electrical connection at the cylinder 10 injector; Engine control module software calibration issue or internal fault; Contaminated engine oil affecting variable valve timing operation; Low fuel pressure or restricted fuel supply affecting injection timing; Worn timing chain or belt causing camshaft timing deviation; Failed camshaft position sensor or crankshaft position sensor providing inaccurate timing signals

DTC codes / P01xx · Fuel and air metering / P01DE

P01DECylinder 10 Injection Timing Performance - Over Advanced

Q: What does code P01DE mean?

Cylinder 10 Injection Timing Performance - Over Advanced. P01DE indicates that the engine control module has detected the fuel injection timing for cylinder 10 is more advanced than the commanded value during its self-test. The computer compares the actual injector opening event to the expected timing and flags an over-advanced condition when the deviation exceeds a calibrated threshold.

P01DE indicates that the engine control module has detected the fuel injection timing for cylinder 10 is more advanced than the commanded value during its self-test. The computer compares the actual injector opening event to the expected timing and flags an over-advanced condition when the deviation exceeds a calibrated threshold.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaFuel and air metering

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or misfire sensation, especially when the engine is cold
Reduced engine power or hesitation during acceleration
Increased fuel consumption due to inefficient combustion
Occasional hard starting or extended cranking
Audible pinging or knocking under load if the advanced timing causes detonation

Common causes, most likely first

Faulty fuel injector for cylinder 10, such as a sticking or leaking nozzle
Wiring harness damage or poor electrical connection at the cylinder 10 injector
Engine control module software calibration issue or internal fault
Contaminated engine oil affecting variable valve timing operation
Low fuel pressure or restricted fuel supply affecting injection timing
Worn timing chain or belt causing camshaft timing deviation
Failed camshaft position sensor or crankshaft position sensor providing inaccurate timing signals

How to diagnose and fix it

Connect a scan tool and verify P01DE is current, then check for related codes and freeze-frame data
Inspect the cylinder 10 injector connector and wiring for corrosion, chafing, or loose pins
Perform a fuel injector balance test or swap the cylinder 10 injector with a known-good one to see if the code moves
Check fuel pressure and volume against the manufacturer's specification
Verify engine oil condition and level, and inspect variable valve timing components if equipped
Use a lab scope to compare camshaft and crankshaft sensor signals for timing chain stretch
If all mechanical and electrical checks pass, reprogram or replace the engine control module as a last resort

Cylinder 10 injection timing over-advanced traps

A dirty or failing mass airflow sensor can skew the calculated injection timing and set this code without any injector fault.
The code may be stored intermittently due to a poor ground connection at the engine block, which affects injector driver operation.
On engines with variable valve timing, a stuck oil control valve can alter cam phasing and cause the ECM to perceive over-advanced injection timing.
Replacing the cylinder 10 injector without checking the fuel rail pressure can lead to a repeat code if low pressure is the real cause.
Some aftermarket performance tuners alter injection timing tables and can trigger P01DE even when all hardware is functioning correctly.

Can I keep driving with P01DE?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy acceleration or towing until the fault is diagnosed. Prolonged driving with over-advanced injection timing can lead to engine damage from detonation or overheating.

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.