OBD Guide
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P1E42

Electric Servo Brake System Fail-Safe Relay Stuck Off

P1E42 is an OBD-II diagnostic trouble code meaning: Electric Servo Brake System Fail-Safe Relay Stuck Off. Common causes: faulty servo brake relay, problems with wiring to the relay. Estimated repair cost: $17–56.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • The brake system fault indicator is on
  • Increased brake pedal force
  • Disabling Brake Assist
  • Loss of electronic brake booster functions
  • Possible dashboard warnings

Causes

  • Faulty servo brake relay
  • Problems with wiring to the relay
  • Short circuit in relay control circuit
  • Malfunction of the brake system control unit
  • Corrosion of relay contacts

How to Fix

  1. Check the condition of the servo brake system relay
  2. Check the integrity of the wiring to the relay
  3. Check the voltage at the relay contacts
  4. Replace faulty relay
  5. Check the operation of the brake system control unit

Related codes

P1E40P1E41C1E42

FAQ

What does the P1E42 code mean?

P1E42 is an OBD-II diagnostic trouble code that indicates: Electric Servo Brake System Fail-Safe Relay Stuck Off

What causes a P1E42 error code?

The most common causes of P1E42 include: Faulty servo brake relay; Problems with wiring to the relay; Short circuit in relay control circuit; Malfunction of the brake system control unit.

How do I fix a P1E42 diagnostic trouble code?

To fix P1E42: Check the condition of the servo brake system relay. Check the integrity of the wiring to the relay. Check the voltage at the relay contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1E42?

Limited driving only, diagnose soon

How much does it cost to fix P1E42?

The estimated repair cost for P1E42 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat