OBD Guide

C05AF

Brake Booster Motor B Current Sensor Circuit Range/Performance

C05AF is an OBD-II diagnostic trouble code meaning: Brake Booster Motor B Current Sensor Circuit Range/Performance. Common causes: brake booster motor current sensor fault b, wiring harness problems. Estimated repair cost: $56–167.

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

Symptoms

  • Deterioration in braking performance
  • The brake system fault indicator is on
  • Unusual noises when operating the brake booster

Causes

  • Brake booster motor current sensor fault B
  • Wiring Harness Problems
  • Contact corrosion
  • Brake booster motor malfunction

How to Fix

  1. Check wiring harness for damage
  2. Check sensor contacts for corrosion
  3. Replace current sensor if necessary
  4. Check and, if necessary, replace the brake booster motor

Related codes

Error C05AF by Vehicle Brand

FAQ

What does the C05AF code mean?

C05AF is an OBD-II diagnostic trouble code that indicates: Brake Booster Motor B Current Sensor Circuit Range/Performance

What causes a C05AF error code?

The most common causes of C05AF include: Brake booster motor current sensor fault B; Wiring Harness Problems; Contact corrosion; Brake booster motor malfunction.

How do I fix a C05AF diagnostic trouble code?

To fix C05AF: Check wiring harness for damage. Check sensor contacts for corrosion. Replace current sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C05AF?

Limited driving only, diagnose soon

How much does it cost to fix C05AF?

The estimated repair cost for C05AF is $56–167. Actual cost depends on your vehicle, location, and labor rates.

See also: Russian version · NationStat