Fuel and air

P020F — Cylinder 6 Injection Timing Fault

Severity: medium Drive with care, to a shop

What P020F means

P020F is set when the engine control module detects an abnormal injection timing or control condition on cylinder 6. The ECM compares the commanded injector timing with the circuit response and with crankshaft and camshaft sensor signals. When the difference is too large, it turns on the check engine light and may limit engine power. It is most common on diesels but can appear on direct-injection gasoline engines too.

Symptoms

  • Check engine light on
  • Rough idle or misfire
  • Loss of power and sluggish acceleration
  • Higher fuel consumption
  • Smoke or fuel smell from the exhaust, especially on diesels
  • Hard starting or hesitation under load

Possible causes

  1. Faulty cylinder 6 fuel injector (sticking, worn or dirty)
  2. Open, shorted or corroded injector wiring or connector
  3. Failed crankshaft or camshaft position sensor
  4. Injector driver fault inside the ECM
  5. Fuel supply problem such as low pressure or a clogged filter
  6. Air leak upsetting the mixture
  7. Mechanical timing problem (stretched chain, slipped belt)

How to diagnose

  1. Read all codes and freeze frame data and look for other cylinder or sensor codes
  2. Review fuel trims and cylinder balance or contribution data
  3. Inspect the cylinder 6 injector connector and harness, checking pins and ground
  4. Measure injector resistance and check the control signal with a scope or tester
  5. Check fuel pressure and fuel filter condition
  6. Verify crankshaft and camshaft sensor signals
  7. Inspect the intake system for leaks
  8. Check cam timing and chain or belt condition

Common fixes

  • Clean or replace the cylinder 6 injector and perform injector coding or adaptation if required
  • Repair damaged wiring and connectors in the injector circuit
  • Replace a faulty crankshaft or camshaft sensor
  • Fix fuel supply issues: replace the filter, test the pump
  • Repair or replace the ECM only after confirming it is at fault

Questions and answers

What does P020F mean?

It indicates an injection timing or control problem on cylinder 6. The ECM sees that the injector is not operating as commanded, or that the circuit or position sensor signals are off.

Can I drive with P020F?

Briefly and carefully to a shop, yes, but misfires and incorrect injection can harm the catalytic converter and engine. If the engine shakes badly or the light flashes, stop driving.

Do I always need a new injector?

No. Check the wiring, connector, fuel pressure and crank and cam sensors first. Replace the injector once those are ruled out.

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.