OBD Guide
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P1429

Brake System Vacuum Pump Activation Open Circuit

P1429 is an OBD-II diagnostic trouble code meaning: Brake System Vacuum Pump Activation Open Circuit. Common causes: broken or damaged wiring to the pump, faulty vacuum pump relay. Estimated repair cost: $33–167.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Check Engine Light Is On
  • Deterioration in braking performance
  • Hard brake pedal
  • Unusual noises from the pump area
  • Problems with the start-stop system (if equipped)

Causes

  • Broken or damaged wiring to the pump
  • Faulty vacuum pump relay
  • Blown fuse
  • Malfunction of the vacuum pump itself
  • Problems with the brake ECU

How to Fix

  1. Check vacuum pump circuit fuses
  2. Inspect wiring and connectors for damage
  3. Check the functionality of the pump relay
  4. Diagnose the vacuum pump itself
  5. If necessary, replace faulty components

Related codes

P1428P1430P1431

FAQ

What does the P1429 code mean?

P1429 is an OBD-II diagnostic trouble code that indicates: Brake System Vacuum Pump Activation Open Circuit

What causes a P1429 error code?

The most common causes of P1429 include: Broken or damaged wiring to the pump; Faulty vacuum pump relay; Blown fuse; Malfunction of the vacuum pump itself.

How do I fix a P1429 diagnostic trouble code?

To fix P1429: Check vacuum pump circuit fuses. Inspect wiring and connectors for damage. Check the functionality of the pump relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1429?

Limited driving only, diagnose soon

How much does it cost to fix P1429?

The estimated repair cost for P1429 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat