OBD Guide
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C1A64

Brake Control Signal Mismatch

C1A64 is an OBD-II diagnostic trouble code meaning: Brake Control Signal Mismatch. Common causes: damage to the brake wiring harness, malfunction of wheel speed sensors. Estimated repair cost: $56–278.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • ABS/ESP indicator is on
  • Loss of ABS/ESP functions
  • Uneven brake application
  • Activating the emergency brake system

Causes

  • Damage to the brake wiring harness
  • Malfunction of wheel speed sensors
  • Problems with the ABS/ESP control unit
  • Corrosion of contacts in connectors
  • Software failure in the control module

How to Fix

  1. Conduct computer diagnostics to accurately determine the source module of the error
  2. Check the integrity of the wiring harness and connectors
  3. Check the functionality of all wheel speed sensors
  4. If necessary, replace faulty components
  5. Reflash the control unit in case of a software failure

Related codes

C1A63C1A65C0110C0121

FAQ

What does the C1A64 code mean?

C1A64 is an OBD-II diagnostic trouble code that indicates: Brake Control Signal Mismatch

What causes a C1A64 error code?

The most common causes of C1A64 include: Damage to the brake wiring harness; Malfunction of wheel speed sensors; Problems with the ABS/ESP control unit; Corrosion of contacts in connectors.

How do I fix a C1A64 diagnostic trouble code?

To fix C1A64: Conduct computer diagnostics to accurately determine the source module of the error. Check the integrity of the wiring harness and connectors. Check the functionality of all wheel speed sensors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1A64?

Limited driving only, diagnose soon

How much does it cost to fix C1A64?

The estimated repair cost for C1A64 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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