AutoCodes – Mercury – U1A4C Mercury

U1A4C Mercury Code - Build/End Of Line Mode Active

Quick Answer

This Diagnostic Trouble Code (DTC) can be set in the Driver Front Seat Module (DSM) if the seat calibration routine has not been completed successfully. Common causes include Seat calibration routine did not complete successfully, Faulty Driver Front Seat Module (DSM), Driver Front Seat Module harness is open or shorted. 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: U1A4C Mercury indicates Build/End Of Line Mode Active.
Common causes: Common causes include Seat calibration routine did not complete successfully, Faulty Driver Front Seat Module (DSM), Driver Front Seat Module harness is open or shorted.
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 557

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 Jun 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1A4C Mercury Description

This Diagnostic Trouble Code (DTC) can be set in the Driver Front Seat Module (DSM) if the seat calibration routine has not been completed successfully.

OBDII Code U1A4C Mercury - Build/End Of Line Mode Active - AutoCodes.com — U1A4C Mercury Code - Build/End Of Line Mode Active

What does this mean?

What are the Possible Causes of the DTC U1A4C Mercury?

Seat calibration routine did not complete successfully
Faulty Driver Front Seat Module (DSM)
Driver Front Seat Module harness is open or shorted
Driver Front Seat Module circuit poor electrical connection

How to Fix the DTC U1A4C 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 U1A4C 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 U1A4C Mercury code?

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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 U1A4C Mercury Code

1. What does the OBDII code U1A4C for Mercury mean?

The code U1A4C indicates that the Build/End Of Line Mode is active in your Mercury vehicle.

2. What are the common symptoms of U1A4C code in a Mercury?

Common symptoms include the check engine light being illuminated, limited vehicle performance, and potential issues with the transmission system.

3. What are the possible causes of the U1A4C code in a Mercury?

The U1A4C code can be triggered by issues with the transmission control module, wiring problems, or software glitches within the vehicle's computer system.

4. How can I diagnose the U1A4C code in my Mercury?

Diagnosing the U1A4C code typically involves using an OBDII scanner to retrieve the code, checking for any related codes, and inspecting the transmission control module and associated wiring for any visible damage.

5. Can I still drive my Mercury with the U1A4C code present?

It is not recommended to drive your Mercury with the U1A4C code active, as it can lead to potential transmission issues and further damage if not addressed promptly.

6. How do I repair the U1A4C code in my Mercury?

Repairing the U1A4C code often involves resetting the transmission control module, addressing any wiring issues, and updating the vehicle's software to resolve the Build/End Of Line Mode active condition.

7. Can I reset the U1A4C code in my Mercury on my own?

While you may be able to reset the code temporarily with an OBDII scanner, it is important to address the underlying cause of the U1A4C code to prevent it from recurring.

8. Is the U1A4C code in a Mercury a common issue?

The U1A4C code is not as common as some other OBDII codes, but it can occur in Mercury vehicles due to various transmission control module and software-related issues.

9. How much does it cost to repair the U1A4C code in a Mercury?

The cost of repairing the U1A4C code can vary depending on the underlying cause, but it may involve labor costs for diagnosis and repair, as well as potential costs for replacing faulty components.

10. Can I prevent the U1A4C code from appearing in my Mercury?

Regular maintenance, including checking for software updates and addressing any transmission-related issues promptly, can help prevent the U1A4C code from appearing in your Mercury.