AutoCodes – BMW – U111A BMW

U111A BMW Code - Lost Communication With Transmission Data

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Transmission Control Module, Transmission Control Module harness is open or shorted, Transmission Control Module 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: U111A BMW indicates Lost Communication With Transmission Data.
Common causes: Common causes include Faulty Transmission Control Module, Transmission Control Module harness is open or shorted, Transmission Control Module 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 10,199

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 Apr 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U111A BMW Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for State of Health monitoring. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an identification number with at least one critical parameter within 5 seconds of beginning serial data communication, the Diagnostic Trouble Code (DTC) is set.

OBDII Code U111A BMW - Lost Communication With Transmission Data - AutoCodes.com — U111A BMW Code - Lost Communication With Transmission Data

What does this mean?

What are the Possible Causes of the DTC U111A BMW?

Faulty Transmission Control Module
Transmission Control Module harness is open or shorted
Transmission Control Module circuit poor electrical connection

How to Fix the DTC U111A BMW?

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 U111A BMW 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 more information on how to fix the U111A BMW 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 U111A BMW Code

1. What are the common symptoms of OBDII code U111A in a BMW related to lost communication with transmission data?

The common symptoms include erratic shifting, transmission slipping, engine stalls, and the transmission going into limp mode.

2. What are the possible causes of OBDII code U111A in a BMW?

The code U111A can be triggered by issues such as a faulty transmission control module (TCM), damaged wiring or connectors, a defective CAN bus communication system, or a software glitch.

3. How is OBDII code U111A diagnosed in a BMW?

Diagnosing code U111A typically involves using a diagnostic scanner to retrieve the trouble codes, checking the transmission control module for any faults, inspecting the wiring and connectors for damage, and testing the CAN bus communication system.

4. Can OBDII code U111A be repaired at home?

Depending on the underlying cause, some DIY enthusiasts may be able to address the issue themselves by checking and repairing damaged wiring or connectors. However, more complex issues such as a faulty TCM may require professional diagnosis and repair.

5. What are some repair tips for addressing OBDII code U111A in a BMW?

Some repair tips include ensuring all wiring and connectors related to the transmission system are in good condition, performing a thorough visual inspection, and resetting the fault codes to see if the issue persists.

6. Is it safe to continue driving with OBDII code U111A present in a BMW?

It is not recommended to drive with the U111A code present, as it can lead to further transmission issues and potential safety hazards. It is best to address the problem promptly to avoid any complications.

7. How much does it typically cost to repair OBDII code U111A in a BMW?

The cost of repairing code U111A can vary depending on the root cause of the issue. Simple fixes like repairing wiring may be relatively inexpensive, while more complex issues involving the TCM or CAN bus system can be more costly.

8. Can a software update fix OBDII code U111A in a BMW?

In some cases, a software update may resolve communication issues causing the U111A code. It is advisable to consult a BMW dealership or a qualified mechanic to determine if a software update is required.

9. How long does it take to repair OBDII code U111A in a BMW?

The repair time for U111A can vary depending on the specific issue and the availability of parts. Simple fixes like repairing wiring may take a few hours, while more complicated repairs may require a day or more.

10. Is OBDII code U111A a common issue in BMW vehicles?

While not extremely common, code U111A related to lost communication with transmission data can occur in BMW vehicles, particularly in models with complex electronic systems. Regular maintenance and prompt diagnosis can help prevent this issue.