P0211

Code

Generic P — Powertrain

Cylinder 11 Injector A Circuit

Brand: Generic

Type: P — Powertrain

Views: UK: 32 EN: 59 RU: 28

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Page language: EN

Causes

Broken, corroded, or disconnected wiring or connector at cylinder 11 injector
Open or shorted injector (internal coil failure)
Short to battery (B+) or short to ground in harness
Poor or missing injector supply voltage or ground
Faulty PCM/ECM injector driver
Blown fuse or faulty relay supplying injector rail

Symptoms

Check Engine MIL illuminated (DTC P0211 stored)
Misfire on cylinder 11, rough idle
Reduced power, hesitation, or stumbling under load
Poor fuel economy and increased emissions
Possible intermittent start/crank issues if circuit completely open
Noise or unusual injector behavior (clicking absent)

What to check

Verify DTC and freeze-frame / live data with a scan tool; note conditions when code set (rpm, temp, voltage)
Visual inspection of wiring harness and connector at cylinder 11 for damage, corrosion, pin deformation, or water intrusion
Wiggle test harness/connectors while monitoring code or injector signal
Check fuses and relay(s) related to fuel injectors or PCM power
Backprobe injector connector: check for battery voltage on the supply/positive pin with key ON
Measure injector coil resistance and compare to specification

Signal parameters

Injector coil resistance: dependent on injector type — typical ranges: low-impedance 2–4 Ω, high-impedance 10–18 Ω (consult vehicle spec)
Supply voltage at injector supply pin (Key ON): approximately battery voltage (~11–14 V)
Injector drive signal: pulsed switching waveform (0–12 V) or ground-side switching; pulse width varies with load/engine speed (typical pulses 1–10 ms depending on conditions)
Injector current draw (approximate): low-ohm injectors can draw ~1–3 A when energized — verify with spec
Open circuit: infinite resistance or very high resistance; short to ground: near 0 Ω to chassis; short to B+: constant battery voltage present on driver output when it should be switching

Diagnostic algorithm

Retrieve freeze-frame and readiness data; confirm P0211 is current or historic and note operating conditions.
Perform thorough visual inspection of the injector 11 connector and wiring harness for chafing, pin corrosion, burns, or water damage.
With key ON (engine OFF), backprobe the injector connector: verify battery/supply voltage on the feed terminal. If missing, trace fuse/relay/power feed.
Measure injector coil resistance at the connector (unplugged preferred). Compare to spec; an open or shorted coil indicates a bad injector.
Check continuity between the injector driver pin at the PCM and the injector connector pin. Check for shorts to ground or B+ on that circuit.
Use a noid light or oscilloscope while cranking/running to confirm the PCM is commanding the injector (look for proper pulse waveform). If there is no pulse but PCM requests injection, suspect PCM or wiring.
Perform a wiggle test around the harness and connector while monitoring the signal or scanning for code reappearance to identify intermittent faults.
Swap injector 11 with a known-good injector from another cylinder (if practical). If the code/fault follows the injector, replace that injector. If it stays on cylinder 11, focus on harness/PCM.
If wiring and injector are good and the PCM is the only remaining suspect, verify ground and supply circuits to PCM and consult vehicle-specific repair information before PCM replacement (confirm with bench tests or manufacturer procedures).
After repair or replacement, clear codes and road-test; verify code does not return and monitor fuel trim, misfire data, and injection parameters.

Likely causes

Wiring/connector damage or corrosion at injector 11
Failed injector coil (open or shorted)
Intermittent connector contact (wet/corroded or loose pin)
PCM driver fault (less common) or insufficient supply/ground

Fault status

⚠️ Status

Injector A circuit malfunction detected for cylinder 11 (DTC P0211). Indicates an open, short, high-resistance, or driver fault in the injector electrical circuit—inspection of injector, wiring, connector, fuses/relays, and PCM recommended.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours