Code
P0211
GWM
P — Powertrain
- Injector malfunction - cylinder 11
AI status
Completed
Completed
100%
Causes
- Open or short in injector wiring (broken wire, chafing, pinched harness)
- Corroded/loose connector or poor terminal contact at injector
- Failed injector (stuck open/closed, internal short)
- Faulty ground or supply (blown fuse, bad relay, weak battery)
- Low fuel rail pressure or clogged fuel return/strainer causing improper injection behavior
- ECM driver/output stage fault
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or single-cylinder misfire (cylinder 11 indicated)
- Loss of power or hesitation under load
- Reduced fuel economy and increased emissions
- Possible hard starting or stumble
- Localized fuel smell if injector stuck open
What to check
- Read and record freeze-frame and live data (misfire counts, fuel trims)
- Scan for related DTCs (additional injector or misfire codes)
- Visually inspect wiring harness and injector connector for damage, corrosion, or loose pins
- Verify battery voltage and check relevant fuses/relays
- Check fuel rail pressure and fuel filter condition
- Perform a wiggle test on harness while monitoring live data to replicate fault
Signal parameters
- Injector supply: battery voltage (~11–14.5 V with engine running) at the power feed — confirm with spec
- Control signal: ECM switches the injector to ground (low-side) — voltage swings 0 V (on) to battery voltage (off)
- Typical injector pulse width: ~0.5–10 ms depending on load and rpm (varies by engine)
- Injector coil resistance: varies by injector design — common ranges: low-impedance (peak-and-hold) ~2–5 Ω, high-impedance ~10–18 Ω — always use manufacturer specification
Diagnostic algorithm
- Retrieve P0211 and any associated codes; note freeze-frame and misfire counts.
- Visual inspection: with ignition off, inspect the injector connector and wiring for corrosion, damage, or loose pins. Repair any obvious issues.
- Electrical supply check: with key ON, back-probe the injector connector to verify battery feed (should be near battery voltage) and good ground reference.
- Measure injector coil resistance (engine off) and compare to manufacturer spec. Replace if outside spec.
- Confirm injector command: start engine or crank and use a noid light or oscilloscope on the control pin to verify pulses and correct waveform. Observe pulse width and amplitude.
- Swap the suspect injector with a known-good injector from another cylinder; clear codes and run engine. If code follows injector, replace injector.
- If fault does not follow injector, perform continuity and resistance checks from injector connector to ECM pin to locate wiring opens/shorts. Repair wiring as needed.
- If wiring and injector test good, test or replace the ECM driver output for that channel (consult manufacturer procedures before replacement).
- After repairs, clear codes and perform road/drive-cycle test to verify fault does not return. Re-check fuel pressure and system if intermittent issues persist.
- Safety note: relieve fuel system pressure before disconnecting fuel lines or injectors and follow safe battery/disconnect procedures.
Likely causes
- Damaged connector or wiring (pin corrosion, broken wire)
- Failed injector (electrical short or internal mechanical fault)
- Poor power/ground at injector (fuse/relay/battery issue)
- ECM output driver failure
Fault status
Status
Injector circuit malfunction detected on cylinder 11 (P0211). ECM flagged abnormal injector operation or electrical fault on that cylinder.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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