Brake Booster Check Valve Fault
The C0970 code means the vehicle's onboard diagnostic system has detected: Brake Booster Check Valve Fault. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $200 - $800 (parts and labor)
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Common Symptoms
- Brake pedal goes to floor
- Spongy brake pedal feel
- Brake warning light on
- Reduced braking effectiveness
Probable Causes (Ranked by Likelihood)
- Failed master cylinder internal seals Very High
- Low brake fluid level High
- Contaminated or old brake fluid Moderate
- Faulty brake pressure sensor Low
Step-by-Step Diagnostic Procedure
-
Check brake fluid level and condition
-
Test master cylinder for internal bypass
-
Inspect brake booster check valve
-
Test brake fluid moisture content
Frequently Asked Questions
What does code C0970 mean?
C0970 indicates a fault with the brake booster check valve fault.
Can I drive with C0970?
You can drive short distances carefully. Have the brakes inspected as soon as possible.
How much does it cost to fix C0970?
Typical repair costs are $200 - $800 (parts and labor).
Sources
This page is built from documented references. Verify against your own service info before repair work.
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