Damaged or corroded wiring or connector at the rear left ABS solenoid valve.; Open or shorted solenoid coil inside the ABS hydraulic unit.; Faulty ABS control module driver circuit for the rear left solenoid.; High resistance or loose ground connection for the ABS pump motor or module.; Debris or contamination in the brake fluid causing the solenoid valve to stick.; Internal fluid leak or seal failure in the hydraulic unit affecting the solenoid.

DTC codes / C02xx · Brakes, steering and suspension / C0206

C0206ABS Solenoid Valve Rear Left Circuit

Q: What does code C0206 mean?

ABS Solenoid Valve Rear Left Circuit. C0206 indicates that the antilock braking system (ABS) control module has detected an electrical fault in the circuit for the rear left ABS solenoid valve. The module monitors the valve's electrical current and voltage and sets this code when the readings fall outside the expected range, which can prevent the ABS from modulating that wheel during a skid.

C0206 indicates that the antilock braking system (ABS) control module has detected an electrical fault in the circuit for the rear left ABS solenoid valve. The module monitors the valve's electrical current and voltage and sets this code when the readings fall outside the expected range, which can prevent the ABS from modulating that wheel during a skid.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Symptoms you may notice

The ABS warning light is illuminated on the dashboard.
The traction control system (TCS) or stability control (ESC) light may also be on, if equipped.
The ABS may be disabled entirely, though normal braking without ABS usually remains functional.
During hard braking or slippery conditions, the rear left wheel may lock up because the ABS cannot control that valve.
A pulsation or unusual noise from the ABS hydraulic unit may be felt or heard when the system self-tests at startup.
Often no symptoms besides the warning light, especially if the fault is intermittent.

Common causes, most likely first

Damaged or corroded wiring or connector at the rear left ABS solenoid valve.
Open or shorted solenoid coil inside the ABS hydraulic unit.
Faulty ABS control module driver circuit for the rear left solenoid.
High resistance or loose ground connection for the ABS pump motor or module.
Debris or contamination in the brake fluid causing the solenoid valve to stick.
Internal fluid leak or seal failure in the hydraulic unit affecting the solenoid.

How to diagnose and fix it

Inspect the rear left ABS solenoid valve connector and wiring for corrosion, damage, or loose pins; clean and repair as needed.
Check the ABS fuse and relay, and verify battery voltage and ground connections to the ABS module.
Measure the resistance of the rear left solenoid valve coil with a multimeter and compare to the manufacturer's specification.
Perform a wiggle test on the wiring harness while monitoring solenoid resistance or code status to detect intermittent faults.
Use a scan tool to command the ABS solenoid and observe live data to confirm whether the valve responds correctly.
If the solenoid coil or hydraulic unit is faulty, replace the ABS hydraulic unit or module as required, following proper bleeding procedures.
Clear the code and perform a road test to verify the repair and ensure the ABS operates correctly.

Hidden causes of C0206 you should not overlook

A weak or failing battery or charging system can cause the ABS module to set solenoid circuit codes due to low voltage during cranking or operation.
Corrosion inside the ABS module connector, even if it looks clean from the outside, often causes intermittent solenoid circuit faults that disappear when the harness is moved.
The code can be set by a faulty ABS pump motor ground, which affects the entire hydraulic unit's operation and may mimic a solenoid failure.
After replacing the ABS hydraulic unit or module, some vehicles require programming or calibration with a scan tool to recognize the new component.
A sticking solenoid valve due to contaminated brake fluid may not show an electrical fault until the valve is commanded, so live data testing is essential.

Can I keep driving with C0206?

You can usually drive the vehicle with the ABS light on, but the ABS will not function and the rear left wheel may lock during hard braking, increasing stopping distance on slippery surfaces. Avoid hard braking and slippery conditions, and have the system diagnosed promptly to restore full safety.

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.