Code
P0211
HUMMER
P — Powertrain
Injector 11 Control Circuit
Views:
UK: 19
EN: 33
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or short in injector #11 wiring harness
- Poor or corroded connector at injector #11
- Failed injector (stuck open/closed or coil open)
- Blown fuse or faulty relay feeding the injector rail/circuit
- Poor engine/chassis ground or low battery voltage
- Faulty PCM/ECM driver for injector #11
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or intermittent misfire on cylinder 11
- Loss of power, hesitation, or poor acceleration
- Engine may run rough at idle and under load
- Hard start or extended crank time
- Reduced fuel economy
What to check
- Read stored DTCs and freeze frame data with a scan tool
- Check for related or intermittent codes (misfire, fuel trims, other injector circuit codes)
- Visual inspection of injector #11 connector and wiring for damage, corrosion, or loose pins
- Verify battery voltage and main engine/chassis grounds
- Check relevant fuses and fuel/injector relays
- If vehicle supports it, command injector #11 on/off with a scan tool and observe response
Signal parameters
- Injector coil resistance: consult vehicle service manual. Typical ranges (examples only): low-impedance injectors ~0.5–5 Ω; high-impedance injectors ~10–20 Ω — verify OEM spec before replacing
- Supply voltage at injector harness (key ON): ~battery voltage (~12 V) present on feed circuit
- Driver output: PCM typically switches the injector to ground; when commanded ON the driver pulls the circuit near 0 V, when OFF the circuit returns to battery voltage through the feed
- Pulse width varies with engine load and rpm; use a lab scope to verify expected waveform and duty cycle
- Request manufacturer service manual values for exact resistance and waveform parameters
Diagnostic algorithm
- Record all DTCs and freeze-frame data; note conditions when fault occurred
- Perform visual inspection of injector #11 connector, harness and nearby wiring for damage, corrosion, or rodent chew
- Verify battery voltage and main grounds; repair any low-voltage or ground issues
- Check fuses and relays related to the fuel/injector circuit and replace if blown or faulty
- Measure injector #11 coil resistance with engine off and battery disconnected; compare to factory specification
- Back-probe the injector connector with key ON and cranking/running: verify constant battery feed on supply pin and check PCM driver pin for pulsed switching to ground when injector is commanded
- If available, use a lab scope to view injector waveform for correct shape and switching characteristics
- Perform a wiggle test on harness/connectors while monitoring injector command and engine behavior to find intermittent faults
- If safe, swap injector #11 with a known-good injector from another cylinder and clear codes: if code moves to the other cylinder, replace the injector; if code stays on circuit 11, fault is wiring/PCM
- Repair damaged wiring or connector (replace pins, repair harness sections, secure grounds) and re-test
- If wiring and injector test good and problem persists, consider PCM driver failure and consult manufacturer procedures before replacing PCM
Likely causes
- Open or shorted wiring to injector #11 (most likely)
- Corroded/loose connector at injector #11
- Failed injector coil or internal short/high resistance
- Power supply fuse or relay fault to the injector rail
- PCM output driver failure (least common)
Fault status
Status
PCM detected abnormal control circuit behavior for Injector 11 (open, short, high resistance or no command). MIL illuminated. Further testing required to determine whether fault is wiring, injector, power/ground, or PCM.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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