OBD Guide
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C1025

Brake Primary Circuit Overboost Pressure

C1025 is an OBD-II diagnostic trouble code meaning: Brake Primary Circuit Overboost Pressure. Common causes: abs/esp hydraulic unit malfunction, damage to the brake pressure sensor. Estimated repair cost: $111–333.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$111–333 (est.)

Symptoms

  • ABS/ESP indicator is on
  • Brake pedal hardness
  • Reduced braking performance

Causes

  • ABS/ESP hydraulic unit malfunction
  • Damage to the brake pressure sensor
  • Problems in the wiring harness
  • Dirty or clogged brake circuits

How to Fix

  1. Check the brake fluid level
  2. Diagnose the ABS/ESP hydraulic unit
  3. Check pressure sensors and their circuits
  4. Clean or replace faulty components

Related codes

C1026C1027C1028

FAQ

What does the C1025 code mean?

C1025 is an OBD-II diagnostic trouble code that indicates: Brake Primary Circuit Overboost Pressure

What causes a C1025 error code?

The most common causes of C1025 include: ABS/ESP hydraulic unit malfunction; Damage to the brake pressure sensor; Problems in the wiring harness; Dirty or clogged brake circuits.

How do I fix a C1025 diagnostic trouble code?

To fix C1025: Check the brake fluid level. Diagnose the ABS/ESP hydraulic unit. Check pressure sensors and their circuits. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1025?

Limited driving only, diagnose soon

How much does it cost to fix C1025?

The estimated repair cost for C1025 is $111–333. Actual cost depends on your vehicle, location, and labor rates.

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