AutoCodes – GMC – U01B0 GMC

U01B0 GMC Code - Lost Communication With Battery Monitor Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Battery Monitor Module, Battery Monitor Module harness is open or shorted, Battery Monitor 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: U01B0 GMC indicates Lost Communication With Battery Monitor Module.
Common causes: Common causes include Faulty Battery Monitor Module, Battery Monitor Module harness is open or shorted, Battery Monitor 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 4,028

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 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U01B0 GMC Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Battery Monitor Module has not been received.

OBDII Code U01B0 GMC - Lost Communication With Battery Monitor Module - AutoCodes.com — U01B0 GMC Code - Lost Communication With Battery Monitor Module

What does this mean?

What are the Possible Causes of the DTC U01B0 GMC?

Faulty Battery Monitor Module
Battery Monitor Module harness is open or shorted
Battery Monitor Module circuit poor electrical connection

How to Fix the DTC U01B0 GMC?

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 U01B0 GMC 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 U01B0 GMC 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 U01B0 GMC Code

1. What are common symptoms of U01B0 GMC code?

- Common symptoms include issues with battery charging, starting problems, dashboard warning lights, and poor vehicle performance.

2. What are possible causes of U01B0 GMC code?

- Potential causes of this code include a faulty battery monitor module, wiring issues, loose connections, or a drained or damaged battery.

3. How can I diagnose the U01B0 GMC code?

- Diagnosing the code involves checking the battery monitor module, inspecting wiring and connections, testing the battery health, and using a diagnostic scan tool to read the code.

4. Can a drained battery trigger the U01B0 GMC code?

- Yes, a drained or weak battery can trigger the U01B0 code as the battery monitor module may not be receiving sufficient power or communication from the battery.

5. What should I do if I get the U01B0 GMC code?

- If you encounter this code, it is recommended to first check the battery and its connections, then inspect the battery monitor module and related wiring for any issues.

6. Is it safe to continue driving with the U01B0 GMC code?

- It is not recommended to continue driving with the U01B0 code present, as it can lead to further electrical problems and potential issues with the vehicle's performance and safety systems.

7. Can a DIYer repair the U01B0 GMC code?

- Depending on the root cause of the code, some DIYers may be able to address the issue by checking and repairing the battery connections or replacing the battery monitor module. However, complex electrical repairs may require professional assistance.

8. How much does it cost to fix the U01B0 GMC code?

- The cost of fixing the U01B0 code can vary depending on the underlying cause. Simple repairs like fixing loose connections may be inexpensive, while replacing the battery monitor module or addressing wiring issues can be more costly.

9. Will resetting the OBDII system clear the U01B0 GMC code?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause of the problem.

10. Can weather conditions affect the U01B0 GMC code?

- Extreme weather conditions, especially cold temperatures, can impact battery performance and potentially trigger the U01B0 code. It is important to maintain the battery and electrical system properly, especially in harsh weather.