Code
P0206
GWM
P — Powertrain
- Injector malfunction - cylinder 6
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AI status
Completed
Completed
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Causes
- Open or short in injector wiring harness (cylinder 6)
- Corroded or loose injector connector or pin
- Failed fuel injector (electrical coil or internal mechanical failure)
- Insufficient battery/ignition supply to injector circuit
- Faulty ECM/engine control driver for injector 6
- Intermittent wiring damage (chafing, water intrusion)
Symptoms
- Check Engine Light (MIL) on
- Rough idle or vibration
- Misfire felt at idle or under load (often cylinder-specific)
- Reduced engine power and poor throttle response
- Reduced fuel economy and higher emissions
- Possible hard starting or extended cranking
What to check
- Scan vehicle and confirm P0206 stored; note freeze frame and pending/confirmed status
- Check for related codes (misfire codes like P0306, supply/PCM codes)
- Visual inspection of injector 6 connector, wiring and harness routing for damage or corrosion
- Measure injector coil resistance at the connector and compare to manufacturer spec
- Backprobe injector connector while cranking/running to verify supply voltage and control signal
- Verify battery voltage at injector supply (should be ~12V with key on/engine run)
Signal parameters
- Injector coil resistance: typical gasoline multi-point injectors ~10–16 ohms (some low-impedance types 2–6 ohms). Refer to vehicle service spec for exact value.
- Supply voltage: battery voltage (~12 V) present at injector positive feed with key ON/engine running
- Control side: pulsed signal to ground from ECM. Pulse width varies with load (idle pulses often 1–6 ms; under load can exceed 6–12 ms depending on engine and strategy)
- Typical waveform: sharp transition when ECM switches ground with consistent duty cycle; small rise time and clean square pulses expected
- No continuous short to ground or constant 0 V on control pin during running (indicates stuck on)
Diagnostic algorithm
- Record freeze-frame data and related codes. Clear the code and attempt to reproduce to confirm it returns.
- Visually inspect injector 6 connector, wiring and chassis grounds for obvious damage, corrosion or fluid intrusion.
- With ignition OFF, disconnect injector connector and measure injector coil resistance across the two terminals. Compare to spec. Replace injector if out of range or open/shorted.
- Reconnect and backprobe harness with key ON and engine cranking/running: verify constant supply voltage (12 V) at the feed terminal and observe the control terminal is being pulsed by the ECM.
- Wiggle test wiring and connectors while monitoring live data/oscilloscope to find intermittent opens or shorts.
- If control signal absent but supply present, trace continuity from injector connector to ECM pin. Check for shorts to ground/12V. Repair wiring or connector faults as needed.
- If wiring and connector check good but injector still fails, swap injector 6 with a known-good injector from another cylinder. If the fault follows the injector, replace the injector.
- If the fault stays on cylinder 6 after swapping, suspect ECM driver or internal PCM fault — confirm wiring and grounds again and consider ECM testing/replacement per manufacturer procedures.
- After repairs, clear codes and road test to ensure P0206 does not return and related misfire symptoms are resolved.
Likely causes
- Damaged connector or pin at cylinder 6 injector (corrosion, bent pin)
- Injector coil open or shorted (internal electrical failure)
- Broken wire or intermittent short to ground/12V in harness to cylinder 6
- Failed ECM output transistor for injector 6
- Poor ground or main relay/fuse supplying injectors
Fault status
Status
Injector circuit malfunction detected for cylinder 6. ECM recorded abnormal electrical behavior or lack of expected injector control. MIL set; diagnostic and repairs required.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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