Fuel and air

P020C — Cylinder 3 Injection Timing Malfunction

Severity: medium Drive with care, to a shop

What P020C means

P020C means the engine control module detected a problem with the injection timing or the control circuit of the cylinder 3 fuel injector. Normally the module fires each injector at the right moment based on crankshaft and camshaft sensor signals and monitors the circuit. When timing or circuit behavior is out of range, it stores the code and turns on the check engine light.

Symptoms

  • Check engine light on
  • Misfire, especially on cylinder 3
  • Rough idle or stumbling
  • Loss of power or hesitation when accelerating
  • Higher fuel consumption
  • Hard starting
  • Increased exhaust emissions

Possible causes

  1. Faulty cylinder 3 fuel injector (electrical or mechanical)
  2. Damaged wiring or poor connector contact at the injector
  3. Crankshaft or camshaft position sensor fault
  4. Injector driver circuit failure inside the control module
  5. Engine timing problem (stretched chain, slipped belt)
  6. Fuel supply problem such as low pressure
  7. Air leak that skews the mixture

How to diagnose

  1. Scan all codes and freeze frame data and look for related misfire codes
  2. Review fuel trims and cylinder balance data
  3. Inspect the cylinder 3 injector connector and harness for damage, corrosion or chafing
  4. Measure injector resistance and check for power and the control pulse with a scope or noid light
  5. Swap injectors if the design allows and see whether the fault follows
  6. Test fuel pressure
  7. Check crankshaft and camshaft sensor signals and verify cam timing
  8. Look for intake air leaks

Common fixes

  • Replace the cylinder 3 injector
  • Repair the wiring or replace the damaged connector
  • Replace a faulty crankshaft or camshaft sensor
  • Correct the engine timing
  • Repair or replace the control module if the injector driver is confirmed bad

Questions and answers

What does P020C mean?

It is a fault in the control or timing of the cylinder 3 fuel injector. The cause can be the injector, wiring, shaft position sensors or the control module.

Can I drive with P020C?

Only a short, careful trip to a shop. Extended driving risks misfires, power loss and catalytic converter damage.

How do I find the cause of P020C quickly?

Start by inspecting the cylinder 3 injector wiring and connector, then test injector resistance and the control signal. If those are fine, check the crank and cam sensors and engine timing.

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.