AutoCodes – Mercury – C1205 Mercury

C1205 Mercury Code - ABS Rear Dump Valve Circuit Short To Ground

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the ABS Rear Dump Valve. Common causes include Faulty ABS Rear Dump Valve, ABS Rear Dump Valve harness is open or shorted, ABS Rear Dump Valve circuit poor electrical connection. 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: C1205 Mercury indicates ABS Rear Dump Valve Circuit Short To Ground.
Common causes: Common causes include Faulty ABS Rear Dump Valve, ABS Rear Dump Valve harness is open or shorted, ABS Rear Dump Valve circuit poor electrical connection.
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 1,016

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Aug 21, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1205 Mercury Description

The Anti-Lock Brake System (ABS) Module monitors the ABS Rear Dump Valve. The ABS Module sets the OBDII code when the ABS Rear Dump Valve is not to factory specifications.

OBDII Code C1205 Mercury - ABS Rear Dump Valve Circuit Short To Ground - AutoCodes.com — C1205 Mercury Code - ABS Rear Dump Valve Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC C1205 Mercury?

Faulty ABS Rear Dump Valve
ABS Rear Dump Valve harness is open or shorted
ABS Rear Dump Valve circuit poor electrical connection

How to Fix the DTC C1205 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1205 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.

Need more information about the C1205 Mercury code?

Need more information on how to fix the C1205 Mercury code? Get Access to Factory Service Manuals

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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 C1205 Mercury Code

What does the OBDII code C1205 indicate?

The OBDII code C1205 indicates a fault in the ABS system related to the rear dump valve circuit, specifically a short to ground.

What are common symptoms of a C1205 code?

Common symptoms include the ABS warning light illuminated on the dashboard, potential loss of ABS functionality, and abnormal brake behavior, such as increased stopping distance.

What could cause the C1205 code to trigger?

Causes may include damaged wiring or connectors in the rear dump valve circuit, a malfunctioning dump valve, or issues with the ABS control module.

Can I drive my vehicle safely with a C1205 code?

While you can drive the vehicle, it is not recommended as the ABS system may not function properly, increasing the risk of brake failure, especially in slippery conditions.

How can I diagnose the C1205 code?

Begin by visually inspecting wiring and connectors for damage, then use a multimeter to check for continuity in the rear dump valve circuit. If necessary, test the dump valve and ABS control module for faults.

What repairs are typically needed for a C1205 code?

Repairs may involve replacing damaged wiring or connectors, fixing or replacing the rear dump valve, or repairing or replacing the ABS control module if it is found to be faulty.

Is it necessary to reset the ABS after repairs for a C1205 code?

Yes, after performing repairs, it is essential to clear the code using an OBDII scanner and conduct a test drive to ensure the issue is resolved and the code does not reappear.

Can a C1205 code be caused by a low brake fluid level?

A low brake fluid level can trigger other ABS-related codes, but it typically does not directly cause a C1205 code. However, it's always good practice to check fluid levels when diagnosing ABS issues.

How much does it typically cost to repair a C1205 code?

Repair costs can vary widely depending on the cause, ranging from $50 to $500 or more. Simple wiring repairs will be less expensive, while replacing components like the ABS module can be more costly.