What it means
The brake booster solenoid is not performing as expected. The code alone does not establish whether the cause is the solenoid or its control circuit.
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 booster solenoid controls a brake-assist action, and the module checks whether the solenoid responds as expected. This code sets when the observed performance does not match the command; it does not by itself distinguish a sticking solenoid from an electrical or control problem.
Common causes
Most likely first.
- Brake booster solenoid sticking or binding
- Solenoid electrical fault
- Damaged wiring or poor connector contact
- Control module fault
Symptoms
- Brake or ABS warning light
- Brake assist may be reduced, depending on the system
How to diagnose it
- Read brake-module freeze-frame, command data, and companion codes to see when the solenoid failed to respond as expected.
- Inspect the solenoid and linkage or mounting area for contamination, damage, or signs that the solenoid may be binding.
- Check the solenoid connector and wiring for loose terminals, corrosion, chafing, or intermittent contact.
- Test solenoid operation and circuit response using the vehicle's supported scan-tool controls and the manufacturer's procedure.
- If the solenoid and wiring pass, check module inputs and output operation before considering a module fault.
Common fixes
- Restore a loose or corroded solenoid connection.
- Repair damaged wiring or terminals affecting the solenoid command.
- Replace a solenoid that sticks or fails the specified electrical or operating test.
- Repair or replace the control module only after the solenoid circuit and inputs are verified.
Can I keep driving?
Brake assist may be reduced, potentially increasing pedal effort or stopping distance. Keep speed low, avoid demanding routes, and stop driving if braking response is abnormal.
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.