AutoCodes – Ford – U0074 Ford

U0074 Ford Code - Control Module Communication Bus 'B' Off

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control 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: U0074 Ford indicates Control Module Communication Bus 'B' Off.
Common causes: Common causes include Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s), Check for more codes, Faulty Control 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 29,356

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 U0074 Ford Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U0074 Ford - Control Module Communication Bus 'B' Off - AutoCodes.com — U0074 Ford Code - Control Module Communication Bus 'B' Off

What does this mean?

What are the Possible Causes of the DTC U0074 Ford?

Diagnosis of this Diagnostic Trouble Code (DTC) is accomplished via the vehicle symptom(s)
Check for more codes
Faulty Control Module
Control Module harness is open or shorted
Control Module circuit poor electrical connection

How to Fix the DTC U0074 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 U0074 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.

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Need Help with the 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 U0074 Ford Code

1. What does the OBDII code U0074 for Ford mean?

The U0074 code indicates that the Control Module Communication Bus 'B' is off, meaning there is a communication issue between control modules in the vehicle.

2. What are the common symptoms of the U0074 code in a Ford vehicle?

Common symptoms include communication errors between control modules, warning lights such as the Check Engine Light or ABS light, and potential issues with various vehicle systems.

3. What are the possible causes of the U0074 code in a Ford vehicle?

Potential causes include faulty control modules, damaged wiring or connectors, low battery voltage, software issues, or a problem with the CAN (Controller Area Network) bus system.

4. How can I diagnose the U0074 code in my Ford vehicle?

Diagnosis typically involves using a professional OBDII scanner to retrieve the specific code and checking for any related codes or communication errors between modules. A thorough inspection of wiring and connectors is also recommended.

5. Can I still drive my Ford vehicle with the U0074 code present?

It is not recommended to drive the vehicle with the U0074 code present, as it can lead to potential safety hazards and performance issues. It's best to address the underlying problem before driving the vehicle.

6. How can I repair the U0074 code in my Ford vehicle?

Repairing the U0074 code may involve fixing any wiring or connector issues, replacing faulty control modules, updating software, or addressing any underlying problems with the CAN bus system. It's best to consult a professional mechanic for a proper diagnosis and repair.

7. Will resetting the trouble codes make the U0074 code disappear?

Resetting the trouble codes may temporarily clear the U0074 code, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and repair the root cause of the problem.

8. How much does it typically cost to repair the U0074 code in a Ford vehicle?

The cost of repairing the U0074 code can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor costs. It's best to obtain a diagnosis from a mechanic for an accurate estimate.

9. Can a DIY enthusiast fix the U0074 code in a Ford vehicle?

While some DIY enthusiasts may be able to diagnose and address simple wiring or connector issues related to the U0074 code, more complex repairs involving control modules or the CAN bus system are best left to professional mechanics with the proper tools and expertise.

10. How long does it typically take to repair the U0074 code in a Ford vehicle?

The repair time for the U0074 code can vary depending on the specific cause of the issue and the extent of repairs needed. Simple fixes like checking wiring may take less time, while more complex repairs involving control modules or software updates may require more time.