My engine is a V8 or V10. Why am I getting P0211?

You should not be. P0211 refers to cylinder 11, which only exists on engines with twelve or more cylinders. On anything smaller there is no cylinder 11 for the module to monitor. The usual causes are a scan tool misreading the code, a manufacturer-specific code being looked up in a generic table, or a stored code left in a shared reader from another vehicle. Re-scan with a tool that supports your make before spending money on parts.

Why does my V12 have two engine control modules?

Twelve cylinders are more inputs and outputs than a single module of that era was designed to handle, so several manufacturers split the job — one module per bank, operating as a master and slave pair or as two coordinated units. For this code it means cylinder 11 is driven by whichever module serves its bank. It also means a power, ground, or communication fault at one module can set injector circuit codes across an entire bank at once. If that is the pattern you are seeing, replacing injectors will not fix anything.

Is this a job I can do myself?

The electrical testing — checking the fuse, back-probing for feed voltage, measuring injector coil resistance, inspecting the connector — is within reach of a careful DIYer with a multimeter and is worth doing, because it can find a connector or fuse fault for very little. The repair itself is harder to recommend. V12 injectors are expensive, low-volume parts, access usually means dismantling an elaborate intake assembly, and reading the per-bank module data properly needs factory-level tooling. Diagnose what you can, then take a clear picture of the findings to a shop that knows the engine.

Can I keep driving with P0211?

Drive it to a shop and no further. A dead cylinder is a sustained misfire that sends unburned fuel into the exhaust, and it will overheat the catalytic converter on that bank. On a twelve-cylinder engine the exhaust components are expensive enough that letting this run is a poor trade against the cost of the injector repair. If the check engine light is flashing, stop driving and have the vehicle towed.

OBD-II trouble code

P0211: Injector Circuit/Open - Cylinder 11

An electrical fault in the cylinder 11 fuel injector control circuit. Cylinder 11 exists only on twelve-cylinder engines, which changes both the diagnosis and the economics — these engines often use two control modules, one per bank.

Medium severityPowertrainFuel InjectorsDrivable short-term

Quick facts

System: Powertrain
Category: Fuel Injectors
Severity: Medium severity
Drivable: Usually safe to drive short-term
Repair cost range: $80 – $2,500
DIY difficulty: Advanced DIY

What does P0211 mean?

The engine control module (ECM) fires each fuel injector by pulsing its control circuit — battery voltage feeds one side of the injector while the ECM switches the ground on the other side for a precise number of milliseconds. It monitors that circuit electrically, and when the feedback does not match the command it sets an injector circuit code. P0211 isolates the fault to the cylinder 11 injector circuit.

Cylinder 11 exists only on engines with twelve or more cylinders. In practice that means the V12s from Mercedes-Benz, BMW, Jaguar, Aston Martin, Ferrari and Lamborghini, plus W12 engines from the Volkswagen group and a range of industrial, marine, and heavy-equipment engines. If your vehicle has ten cylinders or fewer, P0211 cannot legitimately apply, and the likely explanation is a scan tool misreading a manufacturer-specific code or looking it up in the wrong table. Re-scan with a tool that supports your make before spending anything.

The most important structural difference on a twelve-cylinder engine is that it frequently does not have one engine control module. Many V12s — Mercedes M120 and M275/M279, BMW M70/N73/N74, and others — use two control modules, one per bank, operating as a master and a slave, or a pair of coordinated units. That matters a great deal for this code. It means cylinder 11 is driven by the module that serves its bank, not by a single central computer, and a fault that looks like a wiring problem can equally be a communication or power supply problem affecting one module. It also means the diagnostic path includes checking whether the module for that bank is powered, grounded, and communicating before you conclude anything about the injector. On some of these engines a single failed module produces circuit codes across every cylinder on one side at once — a pattern that no amount of injector replacement will fix.

Beyond that, the standard logic applies. "Circuit/Open" is an electrical description rather than a verdict on the injector. A broken or chafed wire, a corroded or backed-out connector pin, a poor ground, or a blown fuse will all set it, as will an injector coil that has failed open. Injectors on these engines are fed in groups through shared fuses and relays, so if P0211 appeared alongside other injector codes, back-probe a couple of connectors for battery voltage before assuming you need parts.

The economics deserve stating plainly. V12 injectors are low-volume parts and are often only available through the dealer, so the price per injector is typically well above what the same job costs on a V8. Access can be involved, since these engines fill their bays completely and the intake assemblies are elaborate. And the diagnostic work benefits substantially from a factory-level scan tool, because generic tools frequently cannot see the per-bank module data these engines report. For most owners, this is a code to take to a shop that knows the specific engine rather than one to work through by trial and error — a wrong guess here is an expensive one.

Common causes

Corroded, loose, or backed-out connector pins at the cylinder 11 injector
Broken or chafed wiring to the cylinder 11 injector
Open or shorted coil winding inside the cylinder 11 injector
Blown injector fuse or failed relay feeding that bank's injector group
Poor ground or a corroded splice in the shared injector power feed
Power supply, ground, or communication fault at the control module serving that bank on a dual-module V12
Harness damage from previous work on the intake or valve covers, which are elaborate on these engines
Failed cylinder 11 injector driver inside the control module serving that bank

Symptoms

Check engine light on, sometimes flashing if cylinder 11 is dead
Rough idle and engine vibration, particularly noticeable on an engine designed to be exceptionally smooth
Loss of power and hesitation on acceleration
A cylinder 11 misfire, often as a companion P0311
Raw fuel smell or increased fuel consumption
Hard starting in some cases
Multiple injector codes on one bank if the module or feed for that bank has failed

Diagnostic steps

1.Confirm your engine actually has twelve or more cylinders. If it does not, re-scan with a tool that supports your make before spending anything.
2.Record every stored code and map the affected cylinders to banks. On a dual-module V12, circuit codes across one entire bank point at that bank's control module, its power supply, or its ground — not at the injectors.
3.Confirm both control modules are powered, grounded, and communicating before diagnosing individual circuits, using a scan tool that can see per-bank data.
4.Identify which physical cylinder your engine calls number 11 and which bank it is on, from the numbering diagram for your specific engine.
5.Check the injector fuse and relay for that bank's group first — the cheapest possible outcome and the fastest to rule out.
6.Back-probe the cylinder 11 injector connector for battery voltage on the feed side with the key on. No voltage means the fault is upstream of the injector.
7.Inspect the connector and harness for corrosion, chafing, heat damage, and backed-out pins, then wiggle-test while watching live data.
8.Measure the cylinder 11 injector's coil resistance with the key off and compare it to specification and to the other injectors. An open or badly out-of-spec reading condemns the injector.
9.Use a noid light or the scan tool's injector test at the connector to confirm the module is pulsing the circuit.
10.Swap-test with a known-good injector from another cylinder if the resistance reading is borderline, rather than buying a low-volume part on a guess.
11.Only if the fuse, feed, ground, wiring, and injector all test good should you suspect the injector driver in the module for that bank, since replacement requires programming.

Repair cost

$80 – $2,500

A wiring or connector repair is often $80-$350, reflecting the tighter access on a twelve-cylinder engine bay. A blown fuse can be a few dollars. Injectors for V12 and W12 engines are low-volume parts frequently sold only through the dealer, so expect $150-$700 per injector rather than the $60-$400 typical of a V8, plus 1-4 hours of labor depending on where the cylinder sits and how much of the intake assembly has to come off. Diagnosis on these engines commonly runs $150-$300 because factory-level tooling is needed to read per-bank module data. A failed injector driver inside a bank control module runs $800-$2,500 including programming, and on dual-module engines the two units usually have to be matched and coded together.

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DIY vs shop

This is an advanced DIY job. It typically requires specialty tools, scan-tool access, lifting equipment, or careful sequencing to avoid causing new failures. Plan for extended downtime and have a backup vehicle. Most owners are better served by a shop that has done this repair before.