OBD Guide
ENFRDEESPT

P1A1B

Brake System Control Module Forced Engine Running

P1A1B is an OBD-II diagnostic trouble code meaning: Brake System Control Module Forced Engine Running. Common causes: malfunction of the brake system control module, problems in the module electrical circuit. Estimated repair cost: $56–278.

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

Symptoms

  • Check Engine Light Is On
  • The engine is running in forced mode
  • Reduced braking performance
  • Activation of emergency operation
  • Other ABS/ESP errors appear

Causes

  • Malfunction of the brake system control module
  • Problems in the module electrical circuit
  • Software glitches
  • Malfunction of wheel speed sensors
  • Damage to the ABS hydraulic unit

How to Fix

  1. Check error codes in the ABS/ESP system
  2. Diagnose the condition of the brake system control module
  3. Check the integrity of electrical circuits and connectors
  4. Update module software
  5. If necessary, replace the control module

Related codes

P1A1AP1A1CC1234

FAQ

What does the P1A1B code mean?

P1A1B is an OBD-II diagnostic trouble code that indicates: Brake System Control Module Forced Engine Running

What causes a P1A1B error code?

The most common causes of P1A1B include: Malfunction of the brake system control module; Problems in the module electrical circuit; Software glitches; Malfunction of wheel speed sensors.

How do I fix a P1A1B diagnostic trouble code?

To fix P1A1B: Check error codes in the ABS/ESP system. Diagnose the condition of the brake system control module. Check the integrity of electrical circuits and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1A1B?

Limited driving only, diagnose soon

How much does it cost to fix P1A1B?

The estimated repair cost for P1A1B is $56–278. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat