What it means
The brake control module monitors the pressure control valve actuator as it is commanded to move. It sets this code when the actuator remains stuck or its position fails to change as expected.
At a glance
- Usually lights the ABS or stability-control warning light
- The engine or gearbox may go into limp mode
How it works
The brake control module commands a pressure control valve actuator to move and monitors whether its position changes as expected. C004E sets when the actuator or valve remains stuck, which can result from mechanical binding, internal wear, contamination, or an electrical fault.
Common causes
Most likely first.
- Valve mechanically stuck
- Actuator motor or solenoid failure
- Damaged wiring or connector
- Valve contamination or internal wear
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
How to diagnose it
- Read freeze-frame data and actuator command or position values to determine when the valve failed to respond.
- Inspect the actuator connector and nearby wiring for corrosion, loose pins, damage, or signs of fluid intrusion.
- Check actuator power, ground, and control circuits for opens or shorts using the wiring diagram and manufacturer's specification.
- Use the manufacturer's scan-tool procedure to command the valve and compare commanded movement with position feedback.
- If electrical checks pass, test the valve for mechanical binding or contamination using the manufacturer's hydraulic service procedure.
Common fixes
- Repair a loose, corroded, or damaged actuator connector or wire.
- Restore a faulty actuator power or ground connection.
- Replace the pressure control valve actuator if it fails its commanded movement test.
- Service or replace a mechanically stuck or worn valve according to the manufacturer's procedure.
- Repair the brake control module only if its command or feedback circuit is confirmed faulty.
Can I keep driving?
ABS or stability control may be disabled, and brake pressure control may not work as intended. Avoid hard braking and slippery roads, and do not continue driving if braking feels abnormal or a brake warning is present.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.