C0594
Brake Booster Motor A Performance
C0594 is an OBD-II diagnostic trouble code meaning: Brake Booster Motor A Performance. Common causes: amplifier motor malfunction, wiring harness damage. Estimated repair cost: $111–333.
Symptoms
- Increased brake pedal force
- Uneven braking
- ABS/ESP light on
- Reduced braking performance
Causes
- Amplifier motor malfunction
- Wiring harness damage
- Oxidation of connector contacts
- Problems with the control module
- Mechanical wear of the unit
How to Fix
- Diagnostics of wiring harness and connectors
- Checking the voltage on the amplifier motor
- Testing an electric motor on a stand
- Replacing a faulty component (motor, harness or module)
- Resetting the error and checking the system operation
Related codes
Error C0594 by Vehicle Brand
FAQ
What does the C0594 code mean?
C0594 is an OBD-II diagnostic trouble code that indicates: Brake Booster Motor A Performance
What causes a C0594 error code?
The most common causes of C0594 include: Amplifier motor malfunction; Wiring harness damage; Oxidation of connector contacts; Problems with the control module.
How do I fix a C0594 diagnostic trouble code?
To fix C0594: Diagnostics of wiring harness and connectors. Checking the voltage on the amplifier motor. Testing an electric motor on a stand. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C0594?
Do not drive — repair immediately
How much does it cost to fix C0594?
The estimated repair cost for C0594 is $111–333. Actual cost depends on your vehicle, location, and labor rates.
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