P0206
Injector Circuit Malfunction - Cylinder 6
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Code P0206 signals that the engine control module (ECM) has found an electrical issue in the fuel injector circuit for cylinder 6. This code is only relevant to engines with six or more cylinders, such as V6, V8, or inline-6 configurations. The ECM detected that the voltage, resistance, or current flow in the cylinder 6 injector circuit is not within acceptable limits.
You'll experience typical misfire symptoms: rough idle, engine vibration, and noticeable power loss. On a V6 engine, losing one cylinder represents a significant loss (about 17% of power), which you'll clearly feel during acceleration. The exhaust note may also sound uneven or different from normal. Over time, running with a dead injector can wash cylinder walls with fuel, diluting oil and accelerating wear.
On V-configuration engines, cylinder 6 may be on either bank depending on the manufacturer's numbering convention. Consult your vehicle's service manual to identify the exact location. Diagnosis involves checking the injector connector, testing the wiring for continuity and shorts, and using a noid light to verify ECM output. The injector swap test remains the most definitive diagnostic method for isolating whether the problem is the injector or the circuit.
Severity
Symptoms
- •Check Engine light is on
- •Engine misfires and idles roughly
- •Loss of engine power
- •Increased fuel consumption
- •Vibration felt through the vehicle
- •Possible rough or uneven exhaust note
Likely Causes
The cylinder 6 injector has developed an internal electrical failure, such as an open or shorted winding, preventing fuel delivery.
The wiring to the cylinder 6 injector has been compromised by engine heat, vibration wear, or physical damage.
The electrical connector at the injector has degraded from heat cycles and moisture exposure, creating poor electrical contact.
The ECM's internal output driver that controls the ground path for cylinder 6's injector has failed.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the cylinder 6 fuel injector
- Repair damaged wiring to cylinder 6 injector
- Clean or replace injector connector
- Perform injector swap test to confirm diagnosis
Shop Parts
Videos
Causes and Fixes P0206 Code: Injector Circuit/Open Malfunction Cylinder 6
HVAC Mechanic
P0206 Misfire? Don't Replace Injectors Just Yet!
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