Brake Booster Vacuum Sensor Low
The C0371 code means the vehicle's onboard diagnostic system has detected: Brake Booster Vacuum Sensor Low. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $900 (parts and labor)
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Common Symptoms
- Hard brake pedal
- Brake booster warning light on
- Increased braking effort required
- Brake assist not functioning
Probable Causes (Ranked by Likelihood)
- Failed brake booster motor or vacuum sensor Very High
- Vacuum leak in booster system High
- Damaged booster wiring Moderate
- Brake booster control module failure Low
Step-by-Step Diagnostic Procedure
-
Check brake booster vacuum level or motor operation
-
Inspect booster motor wiring and connector
-
Test brake booster position sensor
-
Monitor booster performance during braking
Frequently Asked Questions
What does code C0371 mean?
C0371 indicates a fault with the brake booster vacuum sensor low system in your vehicle.
Can I drive with C0371?
You can drive short distances but have the system inspected soon.
How much does it cost to fix C0371?
Typical repair costs are $300 - $900 (parts and labor).
Sources
This page is built from documented references. Verify against your own service info before repair work.
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