Fuel and air

P01DE — Cylinder 10 Injection Timing Over-Advanced

Severity: medium Drive with care, to a shop

What P01DE means

P01DE points to an injection timing deviation on cylinder 10: the engine control unit sees fuel injection starting earlier than commanded. The ECU normally times each injector using crankshaft and camshaft sensor signals and compares actual behavior with its target. The code applies to engines with at least 10 cylinders and its exact definition can vary by manufacturer, so check the service information for your vehicle.

Symptoms

  • Check Engine light on
  • Rough idle
  • Misfires
  • Reduced power and sluggish acceleration
  • Higher fuel consumption
  • Increased exhaust emissions

Possible causes

  1. Faulty or clogged injector on cylinder 10
  2. Damaged wiring or poor connection at the injector connector
  3. Irregular fuel pressure (pump or regulator)
  4. ECU calibration or software issue
  5. Air leak affecting the air-fuel mixture
  6. Faulty crankshaft or camshaft position sensor

How to diagnose

  1. Read all codes and freeze frame data, and look for other injection or misfire codes
  2. Review short-term and long-term fuel trims and compare cylinder balance
  3. Inspect the cylinder 10 injector connector and wiring for corrosion, chafing and breaks
  4. Test injector resistance and check the drive signal with a scope
  5. Measure fuel pressure and compare it to the specification
  6. Check the intake for vacuum leaks and the exhaust for leaks
  7. Check the crank and cam sensors and look for ECU software updates

Common fixes

  • Clean or replace the cylinder 10 injector
  • Repair the injector wiring or connector
  • Fix the fuel pressure problem (pump, regulator, filter)
  • Repair intake air leaks
  • Update or reflash the ECU software if the manufacturer recommends it

Questions and answers

What does P01DE mean?

The ECU detected that fuel injection on cylinder 10 is starting earlier than commanded. The usual culprits are the injector, its wiring or the fuel supply.

Can I drive with P01DE?

Briefly, to get to a shop, but don't put it off. Incorrect injection timing can cause misfires, power loss and catalytic converter damage.

Will clearing the code fix it?

No. The code will return until the underlying injector, wiring or fuel system problem is repaired.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.