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DTC codes / P02xx · Fuel and air metering (injector circuits) / P0206

P0206Injector Circuit/Open - Cylinder 6

P0206 indicates that the engine control module has detected an open circuit or excessive resistance in the fuel injector circuit for cylinder 6. The computer commands the injector to fire but does not see the expected electrical response, meaning the injector may not be spraying fuel. This can cause a misfire, rough running, and a noticeable loss of power.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Check engine light illuminated, often with no other symptoms besides the warning light
  • Rough idle or shaking, especially noticeable when the engine is cold
  • Misfire felt as a stumble or hesitation during acceleration
  • Reduced engine power and poor fuel economy
  • Engine may run rough or stall when coming to a stop
  • A strong raw fuel smell from the exhaust if the injector is stuck open or leaking

Common causes, most likely first

  1. Failed fuel injector with an open internal coil winding
  2. Damaged or corroded electrical connector at the cylinder 6 injector
  3. Broken, chafed, or shorted wire in the injector harness near the cylinder 6 injector
  4. Loose or corroded terminal at the engine control module connector
  5. Faulty engine control module injector driver circuit (rare)
  6. Rodent damage to the injector wiring harness

How to diagnose and fix it

  1. Perform a visual inspection of the cylinder 6 injector connector and wiring for damage, corrosion, or looseness
  2. Use a noid light or oscilloscope to check for a command signal at the injector connector while cranking the engine
  3. Measure the resistance of the cylinder 6 injector with a multimeter and compare it to the manufacturer's specification
  4. Check for continuity and short-to-ground on the injector control wire between the injector and the engine control module
  5. Swap the cylinder 6 injector with a known-good injector from another cylinder to see if the misfire moves
  6. Repair or replace any damaged wiring, connectors, or terminals found during testing
  7. Replace the faulty fuel injector if electrical tests confirm an open circuit inside the injector

Before you replace the cylinder 6 injector

  • A loose or corroded connector at the injector is a far more common cause of P0206 than a failed injector itself, so always inspect and clean the terminals first.
  • The engine control module may set P0206 even when the injector is mechanically clogged but electrically intact, because the code only monitors the electrical circuit, not fuel flow.
  • Rodent damage to the injector harness is frequently overlooked, especially on vehicles parked outdoors or in rural areas, so trace the wires carefully for chew marks.
  • A shorted or open injector coil can sometimes be intermittent, so wiggle-test the harness while watching live misfire data or using a noid light to catch a failing connection.
  • P0206 can be stored alongside misfire codes for cylinder 6, but the misfire code alone does not confirm a bad injector; the circuit code points to an electrical fault that must be verified with a meter.

Can I keep driving with P0206?

You can drive the vehicle short distances to a repair shop, but avoid heavy acceleration, towing, or long trips because unburned fuel can overheat and damage the catalytic converter. If the engine is running very rough or stalling, stop driving and have it towed to prevent further damage.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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