AutoCodes – Ford – U0121 2011 Ford Fusion

U0121 2011 Ford Fusion Code - Lost Communication With The Anti-lock Brake System Control Module

Quick Answer

The Powertrain Control Module (PCM) continuously monitors the Controller Area Network (CAN) for messages from the ABS. Common causes include Damaged CAN communication bus circuit, Faulty Anti-lock Brake System (ABS) Control Module, Anti-lock Brake System Control 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: U0121 2011 Ford Fusion indicates Lost Communication With The Anti-lock Brake System Control Module.
Common causes: Common causes include Damaged CAN communication bus circuit, Faulty Anti-lock Brake System (ABS) Control Module, Anti-lock Brake System Control 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 4,258

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 Mar 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0121 2011 Ford Fusion Description

The Powertrain Control Module (PCM) continuously monitors the Controller Area Network (CAN) for messages from the ABS. The Diagnostic Trouble Code (DTC) U0121 sets when the PCM fails to receive the Anti-lock Brake System (ABS) message within the defined amount of time.

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OBDII Code U0121 2011 Ford Fusion - Lost Communication With The Anti-lock Brake System Control Module - AutoCodes.com — U0121 2011 Ford Fusion Code - Lost Communication With The Anti-lock Brake System Control Module

What does this mean?

What are the Possible Causes of the DTC U0121 2011 Ford Fusion?

Damaged CAN communication bus circuit
Faulty Anti-lock Brake System (ABS) Control Module
Anti-lock Brake System Control Module harness is open or shorted
Anti-lock Brake System Control Module circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC U0121 2011 Ford Fusion?

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 U0121 2011 Ford Fusion 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 U0121 2011 Ford Fusion Code

1. What does the OBDII code U0121 in a 2011 Ford Fusion indicate?

The U0121 code means there is a communication problem between the vehicle's ECM and the Anti-lock Brake System Control Module.

2. What are the common symptoms of U0121 in a 2011 Ford Fusion?

Common symptoms of U0121 include the ABS warning light illuminating on the dashboard, loss of ABS functionality, and potential traction control issues.

3. What are the possible causes of the U0121 code in a 2011 Ford Fusion?

Possible causes of U0121 include damaged wiring or connectors, a faulty ABS control module, a malfunctioning ECM, or a weak or dead vehicle battery.

4. How can I diagnose the U0121 code in my 2011 Ford Fusion?

Diagnosing the U0121 code involves checking the wiring and connectors for damage, testing the ABS control module and ECM for functionality, and ensuring the vehicle battery is in good condition.

5. Can I still drive my 2011 Ford Fusion with the U0121 code present?

While it may be possible to drive with the U0121 code, it is not advisable as it can affect the vehicle's ABS and traction control systems, compromising safety.

6. How can I repair the U0121 code in my 2011 Ford Fusion?

Repairing the U0121 code may involve repairing or replacing damaged wiring or connectors, replacing the ABS control module, reprogramming the ECM, or addressing any battery issues.

7. Is it necessary to reset the U0121 code after making repairs to a 2011 Ford Fusion?

Yes, it is recommended to clear the U0121 code using an OBDII scanner after making repairs to ensure the issue is resolved and to turn off the warning light.

8. How much does it typically cost to repair the U0121 code in a 2011 Ford Fusion?

The repair costs for the U0121 code can vary depending on the underlying cause, but it may range from a few hundred dollars for simple fixes to over a thousand dollars for more complex issues.

9. Can the U0121 code in a 2011 Ford Fusion be prevented?

While some causes of the U0121 code may not be preventable, regular vehicle maintenance, checking for wiring issues, and ensuring the battery is in good condition can help reduce the likelihood of encountering this code.

10. Will the U0121 code in a 2011 Ford Fusion cause the vehicle to fail an emissions test?

The U0121 code itself is not directly related to emissions, but it is still important to address and resolve the issue to ensure the vehicle's overall performance and safety.