Fuel and air

P01D0 — Cylinder 3 Injection Timing Over-Advanced

Severity: medium Drive with care, to a shop

What P01D0 means

P01D0 means the engine control module saw fuel injection on cylinder 3 begin earlier than the commanded timing allows. The module calculates injection timing from the crankshaft and camshaft position sensors and then fires the injector. When actual timing drifts outside tolerance, the engine can run rough and the check engine light comes on.

Symptoms

  • Check engine light on
  • Rough running, especially at idle
  • Slight misfire feeling or vibration
  • Reduced power
  • Higher fuel consumption
  • Hard or uneven starting

Possible causes

  1. Worn or faulty cylinder 3 fuel injector with timing or response out of spec
  2. Damaged wiring or a poor connection at the injector connector
  3. Crankshaft or camshaft position sensor fault that skews timing calculation
  4. Fuel supply problem such as low rail pressure
  5. Intake air leak shifting the air-fuel mixture
  6. PCM software fault or internal failure

How to diagnose

  1. Scan all codes and freeze frame data and look for related misfire or sensor codes
  2. Review fuel trims and mixture adaptation values
  3. Inspect the cylinder 3 injector connector and harness, and check power and ground
  4. Test the injector control signal with a scope or meter
  5. Check crankshaft and camshaft sensor signals and condition
  6. Measure fuel pressure and compare it with specification
  7. Compare cylinder balance and misfire counts, and swap injectors if needed to see if the fault follows
  8. Inspect the intake and exhaust for leaks

Common fixes

  • Repair the injector wiring or connector
  • Clean or replace the cylinder 3 injector
  • Replace a faulty crankshaft or camshaft position sensor
  • Fix the cause of low fuel pressure (filter, pump, regulator)
  • Repair air leaks
  • Update software or replace the PCM only after other causes are ruled out

Questions and answers

What does P01D0 mean?

The PCM found that fuel injection on cylinder 3 starts too early. The cause may be the injector, wiring, position sensors or the control module itself.

Can I drive with P01D0?

Briefly, to reach a shop, usually yes if there is no heavy shaking or misfire. Don't put it off, since bad injection timing can hurt fuel economy and damage the engine or catalytic converter.

How do I fix P01D0?

Start with the cylinder 3 injector wiring and connector, then check the crank and cam sensors and fuel pressure. If those are good, clean or replace the injector.

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.