OBD Guide
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C1181

Active Booster Response

C1181 is an OBD-II diagnostic trouble code meaning: Active Booster Response. Common causes: brake booster pressure sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $56–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Reduced braking performance
  • ABS/ESP warning light comes on
  • Unusual behavior of the brake pedal

Causes

  • Brake booster pressure sensor malfunction
  • Open or short circuit in wiring harness
  • Problems with the brake control unit
  • Mechanical failure of the brake booster

How to Fix

  1. Check fault codes in the ABS/ESP system
  2. Inspect the wiring harness and connectors for damage
  3. Check pressure sensors and other system components
  4. If necessary, replace faulty components
  5. Clear errors and test drive

Related codes

C1180C1182C1183

FAQ

What does the C1181 code mean?

C1181 is an OBD-II diagnostic trouble code that indicates: Active Booster Response

What causes a C1181 error code?

The most common causes of C1181 include: Brake booster pressure sensor malfunction; Open or short circuit in wiring harness; Problems with the brake control unit; Mechanical failure of the brake booster.

How do I fix a C1181 diagnostic trouble code?

To fix C1181: Check fault codes in the ABS/ESP system. Inspect the wiring harness and connectors for damage. Check pressure sensors and other system components. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1181?

Limited driving only, diagnose soon

How much does it cost to fix C1181?

The estimated repair cost for C1181 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat