AutoCodes – Mercury – C1025 Mercury

C1025 Mercury Code - Brake Primary Circuit Overboost Pressure

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Brake Primary Circuit Overboost Pressure. Common causes include Brake system leaks, Air in the brake system, Faulty Anti-Lock Brake System (ABS) Module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C1025 Mercury indicates Brake Primary Circuit Overboost Pressure.
Common causes: Common causes include Brake system leaks, Air in the brake system, Faulty Anti-Lock Brake System (ABS) Module.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 933

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 06, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C1025 Mercury Description

The Anti-Lock Brake System (ABS) Module monitors the Brake Primary Circuit Overboost Pressure. The ABS Module sets the OBDII code when the Brake Primary Circuit Overboost Pressure is not to factory specifications.

OBDII Code C1025 Mercury - Brake Primary Circuit Overboost Pressure - AutoCodes.com — C1025 Mercury Code - Brake Primary Circuit Overboost Pressure

What does this mean?

What are the Possible Causes of the DTC C1025 Mercury?

Brake system leaks
Air in the brake system
Faulty Anti-Lock Brake System (ABS) Module

How to Fix the DTC C1025 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

C1025:21 Brake Primary Circuit Overboost Pressure: Signal Amplitude < Minimum
C1025:22 Brake Primary Circuit Overboost Pressure: Signal Amplitude > Maximum

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1025 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1025 Mercury Code

What does the OBDII code C1025 mean for my Mercury vehicle?

The OBDII code C1025 indicates a "Brake Primary Circuit Overboost Pressure," which suggests that the brake system is experiencing higher than normal pressure in the primary circuit.

What are the common symptoms associated with code C1025?

Common symptoms may include a warning light on the dashboard, stiff or unresponsive brake pedal, decreased braking performance, and unusual noises when applying the brakes.

What could cause the C1025 code to trigger?

Potential causes include a faulty brake booster, issues with the brake master cylinder, a malfunctioning pressure sensor, or an obstruction in the brake lines.

How do I diagnose the C1025 code?

To diagnose C1025, start by using an OBDII scanner to confirm the code. Then, inspect the brake booster, master cylinder, and pressure sensors for any signs of damage or malfunction. Check brake lines for blockages or leaks.

What repairs are typically needed to fix code C1025?

Repairs may involve replacing a faulty brake booster or master cylinder, fixing any brake line obstructions, or replacing a malfunctioning pressure sensor.

Can I drive my Mercury with the C1025 code?

While it may be possible to drive the vehicle, it is not safe to do so if you are experiencing braking issues. It is advisable to address the problem immediately to ensure safe braking performance.

How much will it cost to repair a C1025 code issue?

Repair costs can vary widely depending on the specific cause, but they may range from $100 for minor repairs to over $1,000 if major components like the brake booster or master cylinder need replacement.

Is the C1025 code related to any other OBDII codes?

Yes, C1025 may be related to other brake system codes, such as those for brake fluid pressure or booster performance. A comprehensive diagnostic can help identify any associated codes.

Can I reset the code C1025 after repairs?

Yes, after addressing the underlying issue, you can reset the code using an OBDII scanner, or the code may clear itself after a few successful drive cycles without any issues. However, ensure that the problem is resolved before resetting.