Code
P020F
Generic
P — Powertrain
Cylinder 6 Injection Timing
Views:
UK: 19
EN: 38
RU: 18
AI status
Completed
Completed
100%
Causes
- Open or short in cylinder 6 injector circuit (wiring, connector, corroded pin)
- Faulty or stuck fuel injector on cylinder 6
- Poor ground or low battery/connector voltage to the injector
- Faulty ECM/PCM driver for cylinder 6 injector
- Incorrect camshaft/crankshaft position or timing (cam/crank correlation error)
- Low fuel pressure or fuel rail issues affecting injector operation
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or vibration, especially at idle
- Single-cylinder misfire or misfire codes for cylinder 6 (P0306)
- Reduced engine power and poor acceleration
- Increased fuel consumption and possible black/sooty exhaust
- Hard starting or extended cranking
What to check
- Read stored freeze-frame and related codes (especially misfire, cam/crank, fuel trim codes)
- Check live data: injector pulse width, short/long term fuel trims, misfire counters and RPM
- Perform a visual inspection of the wiring harness and connector for cylinder 6 injector (damage, corrosion, loose pins)
- Measure injector coil resistance (cold) and compare to spec
- Check injector supply voltage and ground at the connector with key ON (battery voltage present when energized)
- Use a noid light or oscilloscope to verify injector pulse/signal while cranking/running
Signal parameters
- Injector pulse width (ms) for cylinder 6
- Injector coil resistance (ohms) and current draw (A)
- Injector duty cycle (%) at various RPM/load
- Fuel rail pressure (psi or bar)
- Short-term and long-term fuel trim (%)
- Cylinder 6 misfire count (events/minute)
Diagnostic algorithm
- Connect a scan tool and record freeze-frame, pending/active codes, and live data (injector pulse, fuel trims, misfires).
- Visually inspect wiring and connector at cylinder 6 injector for damage, corrosion, or loose pins; repair any issues.
- With key ON (engine off), measure injector supply voltage at the connector; verify proper battery voltage and good ground reference.
- Measure injector coil resistance and compare to specification; if out of range, replace the injector.
- Use a noid light or oscilloscope to confirm injector is receiving correct pulse signal while cranking/running; if no pulse, trace wiring back to ECU.
- Swap injector 6 with a known-good injector from another cylinder; if the code/misfire moves with the injector, replace the injector. If it stays on cylinder 6, suspect wiring or ECU driver.
- Check fuel rail pressure and flow; repair fuel pump, filter, or rail issues if out of spec.
- Inspect cam/crank sensor signals and timing correlation (scan tool or scope); correct timing or replace sensors if correlation is outside manufacturer spec.
- If wiring checks fine but injector driver output at the ECU is defective, test/replace ECM per manufacturer procedure.
- After repairs, clear codes and perform a road test / re-scan to verify the fault is resolved and no related codes appear.
Likely causes
- Wiring/connector open, short-to-ground, or short-to-voltage at injector 6
- Injector 6 electrical coil failure or hydraulic sticking
- Faulty ECM output driver for injector 6
- Loss of cam/crank position reference or timing chain/belt jumped
- Insufficient fuel pressure or clogged fuel filter/fuel rail problem
Fault status
Status
Controller detected abnormal injection timing/control or injector circuit fault for cylinder 6. Check injector, wiring/connectors, fuel pressure, cam/crank synchronization, and ECM injector driver.
Repair difficulty: Medium
Diagnostic time: 1.5-4 hours
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