P0211

What it means

P0211 means the engine control unit has detected a fault in the electrical circuit that drives the injector for cylinder 11. The control unit monitors the injector driver and its feedback signal, and it set the code when the current or voltage was open, shorted or outside the expected range. Only engines with at least 11 cylinders, typically V12 layouts, use this code, and the cylinder numbering depends on the manufacturer and engine.

Symptoms

• Engine management warning light on
• Rough running or a misfire on one cylinder, especially at idle
• Noticeable loss of power or hesitation under load
• Poor fuel economy or a smell of unburnt fuel
• Hard starting or an engine that runs on fewer cylinders
• Possible limp mode on some models

Possible causes

• Open circuit or high resistance in the injector wiring or its connector (corrosion, loose pin, chafed or broken wire)likely
• Faulty cylinder 11 injector with an open or shorted coil windinglikely
• Wiring short to earth, to battery voltage or to another circuitpossible
• Damaged or corroded connector at the injector or at the control unitpossible
• Fault in the injector driver inside the engine control unitrare
• Poor power or earth supply to the injector circuit (blown fuse, faulty relay or bad earth)possible

How to diagnose

1. Read all stored and pending codes and the freeze frame data, noting engine speed, load and temperature when the code set, and check for related misfire or other injector codes.
2. Check that the cylinder numbering and injector position for cylinder 11 match the manufacturer data for this engine, as the layout varies by model.
3. Visually inspect the injector connector and wiring loom for heat damage, chafing, rubbing, oil contamination, corrosion or bent pins.
4. Check the relevant fuses, relays and the power and earth supplies to the injector circuit against the wiring diagram.
5. Measure the injector coil resistance and compare it with the manufacturer specification, then check the other injectors on the same bank for comparison.
6. Back-probe or disconnect and test the injector wiring for continuity, short to earth and short to voltage between injector and control unit.
7. Use a scan tool's active test or an oscilloscope to confirm the control unit is producing a correct injector drive pulse.
8. Swap the injector with a known good cylinder if the manufacturer allows it, and see whether the fault follows the injector.

How to fix

• Repair or replace damaged wiring, and clean or replace corroded or damaged connectors and terminals.
• Replace the cylinder 11 injector if its resistance is out of specification or it fails the drive test, and follow any coding or adaptation steps the manufacturer requires.
• Restore faulty power or earth supplies, and replace blown fuses or failed relays after finding why they failed.
• Repair any short in the loom, and secure the wiring clear of heat and moving parts.
• Repair or replace the engine control unit only when the wiring and injector are proven good and the driver fault is confirmed.

Can I keep driving?

Nearby codes

• P0210GenericCylinder 10 Injector A Circuit
• P0212GenericCylinder 12 Injector A Circuit