Code
P0208
GWM
P — Powertrain
- Injector malfunction - cylinder 8
AI status
Completed
Completed
100%
Causes
- Open or short in injector #8 wiring/connector
- Poor connector contact, corrosion or bent pins at the injector
- Failed fuel injector (electrical or mechanical)
- Blown fuse, faulty fuel injector relay, or loss of injector supply voltage
- Faulty PCM/ECM driver circuit for injector #8
- Intermittent wiring damage (pinched, chafed, or water intrusion)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or misfire centered on cylinder 8 (may show as P0308)
- Reduced engine power, hesitation or poor acceleration
- Increased fuel consumption and/or black exhaust smoke
- Hard starting, stumbling during acceleration
- Intermittent faults that may clear or return
What to check
- Read stored DTC(s) and freeze-frame/live data with a capable scan tool
- Check for related codes (misfire codes, low voltage, injector circuit codes)
- Inspect wiring harness, connector and pins at injector #8 for damage, corrosion, or looseness
- Verify battery voltage and engine grounds are good
- Measure injector coil resistance with multimeter and compare to spec
- Back-probe injector connector while cranking/idle to observe supply voltage and driver signal (use scope if available)
Signal parameters
- Injector coil resistance: manufacturer-specific (typical ranges: low-impedance 2–5 Ω; high-impedance 10–16 Ω). Compare to vehicle spec.
- Supply voltage to injector (key ON): battery voltage (~12 V) present on the constant feed terminal
- Driver output signal: PCM typically grounds the injector—expect a pulsed ground; use scope to see square wave pulses
- Pulse width: varies with load/load demand (commonly ~1–10 ms at idle/cranking; increases with load)
- No voltage on supply or no switching at driver pin indicates wiring/power issue; constant ground/voltage may indicate short
Diagnostic algorithm
- Retrieve and record all codes and freeze-frame data. Note misfire counts and operating conditions.
- Visually inspect injector #8 connector, wiring and nearby harness for damage, corrosion, burns, or water intrusion.
- Check battery voltage and main engine/PCM grounds. Verify injector power fuse(s) and relay(s).
- Disconnect connector and measure injector coil resistance. If out of spec, consider replacing injector.
- With connector connected, back-probe the supply terminal to confirm battery voltage with key ON.
- Back-probe the driver terminal and crank or run engine. Use an oscilloscope or DVOM (Hz/pulse) to verify pulsed driver signal. Look for irregularities or no pulse.
- If no pulse or abnormal waveform, check continuity between the PCM pin and injector connector for opens or shorts to ground/voltage.
- Perform a swap test (swap injector #8 with a known-good cylinder) if practical and manufacturer permits. If code follows the injector, replace injector.
- If wiring and injector test good but no correct driver signal, suspect PCM driver fault — verify with manufacturer service information before replacing PCM.
- After repair, clear codes and test drive; re-scan to confirm no return of P0208 and verify proper engine operation.
Likely causes
- Corroded/loose injector connector or pin
- Open or shorted harness to injector #8 (most common)
- Failed injector (electrical coil open or short internally)
- Blown fuse or failed relay supplying injectors
- PCM driver failure (less common)
Fault status
Status
Injector circuit malfunction detected for cylinder 8 (P0208). Inspect injector #8, connector, wiring, power/ground and PCM driver for faults. Repair as needed and confirm no return of code.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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