P0206 2015 GMC Sierra Code - Cylinder 6 Injector Control Circuit

P0206 indicates a fault in the Cylinder 6 Injector Control Circuit, meaning the engine control module (ECM) has detected an issue with the electrical signals sent to the fuel injector on cylinder 6.

Symptoms may include rough idling, reduced engine performance, misfires, poor fuel economy, a check engine light, or difficulty starting the engine.

Common causes include a faulty fuel injector, damaged wiring or connectors in the injector circuit, a malfunctioning ECM, or poor electrical connections.

While the vehicle may still be drivable, driving with code P0206 can cause further engine damage, reduced performance, and increased emissions. It’s best to address the issue promptly.

Start by inspecting the wiring and connectors for cylinder 6's injector, checking for damage or corrosion. Then test the injector itself and use a multimeter to verify proper voltage in the circuit.

Repairs may involve replacing the faulty fuel injector, repairing damaged wiring or connectors, cleaning corroded connections, or in rare cases, replacing the ECM.

Repair costs vary. Replacing a fuel injector typically costs $150–$300 for parts and labor. Wiring repairs may be less expensive, while ECM replacement can exceed $500.

Yes, a clogged or dirty fuel injector can cause intermittent issues, but the code specifically points to an electrical circuit problem, so cleaning the injector may not resolve the issue.

Clearing the code without fixing the underlying issue will only temporarily turn off the check engine light. The code will likely reappear once the problem is detected again.

You’ll need an OBDII scanner, a multimeter, and basic tools to inspect and repair wiring or replace the fuel injector. A wiring diagram for the injector circuit can also be helpful.