OBD Guide
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C15C3

Brake System Control Module Malfunction

C15C3 is an OBD-II diagnostic trouble code meaning: Brake System Control Module Malfunction. Common causes: brake control module internal fault, problems with module power supply (blown fuse, poor contact). Estimated repair cost: $167–556.

Severity
🚨 Critical
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)

Symptoms

  • The brake system fault indicator is on
  • Loss of ABS/ESP functions
  • Unstable operation of the brake system
  • Possible problems with cruise control

Causes

  • Brake control module internal fault
  • Problems with module power supply (blown fuse, poor contact)
  • Short circuit in wiring harness
  • Damage to the CAN bus
  • Contact corrosion

How to Fix

  1. Check brake system fuses
  2. Inspect connectors and wiring harness for damage
  3. Check power supply to control module
  4. Carry out CAN bus diagnostics
  5. If necessary, replace the brake system control module

Related codes

C1251C1253U0121

FAQ

What does the C15C3 code mean?

C15C3 is an OBD-II diagnostic trouble code that indicates: Brake System Control Module Malfunction

What causes a C15C3 error code?

The most common causes of C15C3 include: Brake control module internal fault; Problems with module power supply (blown fuse, poor contact); Short circuit in wiring harness; Damage to the CAN bus.

How do I fix a C15C3 diagnostic trouble code?

To fix C15C3: Check brake system fuses. Inspect connectors and wiring harness for damage. Check power supply to control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C15C3?

Do not drive — repair immediately

How much does it cost to fix C15C3?

The estimated repair cost for C15C3 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

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