C1405: Traction Control Valve Rear Circuit Open
What does C1405 mean?
C1405 is a diagnostic trouble code indicating "Traction Control Valve Rear Circuit Open". This means there is an electrical break in the stability control wiring — a connector may be unplugged, a wire broken, or a component has failed internally. The ECU detected no signal where it expected one.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Intermittent warning lights
- Erratic gauge readings
Estimated repair cost
Typical range in Australia (parts + labour)
Common causes
- Damaged or corroded wiring harness
- Loose or disconnected electrical connector
- Failed stability control sensor or actuator
- Blown fuse in the related circuit
- Poor ground connection
What should you do?
This code sits in the stability and traction control system. Electronic stability control, traction control and the sensors feeding them may be offline, so the car will not correct a slide for you. It will feel completely normal right up until you need it, typically in the wet or in a sudden swerve. Get it diagnosed before driving in poor conditions.
Get a diagnosis for YOUR car
Code C1405 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.