Faulty cylinder 6 fuel injector (open or shorted coil); Damaged, chafed or corroded wiring between the injector and the control unit; Poor connection or corrosion at the injector connector or control unit plug; Short to earth or supply in the injector control or feed wire; Blown fuse or fault in the injector power supply or relay (model dependent); Internal injector driver fault in the engine control unit.

P0206

Cylinder 6 Injector A Circuit.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
06: FaultThe specific fault in that area

What it means

P0206 is the generic code for a fault in the control circuit of the cylinder 6 fuel injector. The engine control unit monitors the injector driver circuit and sets the code when the current or voltage it sees does not match what it expects, such as an open circuit, a short to earth or a short to supply. Depending on the engine, this can apply to petrol or diesel injectors, and the exact monitoring method varies by model.

Symptoms

Engine misfire or rough running, especially on cylinder 6
Malfunction indicator lamp on
Noticeable loss of power and poor acceleration
Hesitation or stumbling under load
Rough idle or difficulty starting
Raised fuel consumption or a fuel smell from the exhaust

Possible causes

Faulty cylinder 6 fuel injector (open or shorted coil)likely
Damaged, chafed or corroded wiring between the injector and the control unitlikely
Poor connection or corrosion at the injector connector or control unit pluglikely
Short to earth or supply in the injector control or feed wirepossible
Blown fuse or fault in the injector power supply or relay (model dependent)possible
Internal injector driver fault in the engine control unitrare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including engine load, speed and temperature when the fault set.
Check for other misfire or injector circuit codes on neighbouring cylinders, which may point to a shared supply or earth fault.
Visually inspect the cylinder 6 injector connector and wiring for chafing, heat damage, corrosion, bent pins or water ingress.
Check the relevant fuses and relays for the injector supply, following the wiring diagram for the specific model and engine.
Measure the injector coil resistance and compare it with the manufacturer specification for that engine.
Use a scan tool's active test, if available, or listen with a stethoscope to confirm the injector is clicking or operating.
Check the injector supply voltage and the control signal at the connector using a multimeter or oscilloscope, referring to the wiring diagram.
Wiggle test the harness with the engine running to find intermittent faults, then check the control unit connector and earths.

How to fix

Replace the cylinder 6 injector if its resistance or operation is out of specification, and code or adapt it if the system requires.
Repair or replace damaged wiring and fix any short or open circuit in the injector harness.
Clean or replace corroded or damaged connectors and terminals, and secure the harness away from heat and sharp edges.
Replace the faulty fuse or relay after finding why it failed.
Have the engine control unit tested and repaired or replaced only after all wiring and injector faults are ruled out.
Clear the code after repair and road test to confirm it does not return.

Can I keep driving?

Medium severity

The car can usually be driven short distances, but should be repaired soon. A persistent misfire can overheat and damage the catalytic converter and cause further drivability problems, so avoid heavy loads and long journeys.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.