AutoCodes – Ford – U0028 Ford

U0028 Ford Code - Vehicle Communication Bus 'A' Bus Off

Quick Answer

The Restraint Control Module (RCM) supplies the stability/traction control system with accelerometer data over a dedicated Controller Area Network (CAN). Common causes include Faulty Restraint Control Module (RCM), Restraint Control Module (RCM) harness is open or shorted, Restraint Control Module (RCM) 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: U0028 Ford indicates Vehicle Communication Bus 'A' Bus Off.
Common causes: Common causes include Faulty Restraint Control Module (RCM), Restraint Control Module (RCM) harness is open or shorted, Restraint Control Module (RCM) 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 15,022

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 29, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0028 Ford Description

The Restraint Control Module (RCM) supplies the stability/traction control system with accelerometer data over a dedicated Controller Area Network (CAN). If the RCM detects a fault with communications with the dedicated CAN circuits, it sets Diagnostic Trouble Code (DTC) U0028. The RCM does not request the Instrument Panel Control (IPC) to illuminate the airbag warning indicator if DTC U0028 is set.

OBDII Code U0028 Ford - Vehicle Communication Bus 'A' Bus Off - AutoCodes.com — U0028 Ford Code - Vehicle Communication Bus 'A' Bus Off

What does this mean?

What are the Possible Causes of the DTC U0028 Ford?

Faulty Restraint Control Module (RCM)
Restraint Control Module (RCM) harness is open or shorted
Restraint Control Module (RCM) circuit poor electrical connection
Faulty Antilock Brake System (ABS) Module

How to Fix the DTC U0028 Ford?

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 U0028 Ford 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 U0028 Ford code?

Need more information on how to fix the U0028 Ford 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 U0028 Ford Code

1. What does the OBDII code U0028 for Ford ("Vehicle Communication Bus 'A' Bus Off") mean?

- This code indicates a communication error on the 'A' bus of the vehicle's communication network.

2. What are the common symptoms of OBDII code U0028 in a Ford vehicle?

- Common symptoms include loss of communication with various control modules, warning lights on the dashboard, and inoperative electronic systems.

3. What are the possible causes of the U0028 code in a Ford vehicle?

- The code can be triggered by issues such as a faulty communication bus, damaged wiring, loose connections, or a malfunctioning control module.

4. How can I diagnose the U0028 code in my Ford vehicle?

- Diagnosing the code typically involves using a diagnostic scanner to retrieve the code and check for communication errors among the vehicle's control modules.

5. What are some DIY repair tips for fixing the U0028 code in a Ford vehicle?

- DIY repair tips include checking and repairing any damaged wiring, ensuring all connections are secure, and resetting the system by disconnecting the battery for a few minutes.

6. Can the U0028 code be safely ignored in a Ford vehicle?

- Ignoring the U0028 code is not recommended as it can lead to further communication issues and potential malfunctions in the vehicle's electronic systems.

7. Is it safe to drive with the U0028 code present in a Ford vehicle?

- It is not advisable to drive with the U0028 code active, as it can affect the vehicle's performance and safety systems.

8. How much does it typically cost to repair the U0028 code in a Ford vehicle?

- The cost of repairing the U0028 code can vary depending on the underlying cause, but it may involve expenses for parts and labor at a repair shop.

9. Can a DIY enthusiast fix the U0028 code issue in a Ford vehicle?

- DIY enthusiasts with the necessary tools and knowledge of automotive electrical systems may be able to diagnose and repair the U0028 code themselves.

10. How can I prevent the U0028 code from reoccurring in my Ford vehicle?

- To prevent the U0028 code from reoccurring, regular maintenance checks, ensuring proper wiring connections, and addressing any communication issues promptly are essential.