AutoCodes – Buick – U01B0 Buick

U01B0 Buick 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 Buick 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 4,693

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

What does this mean?

What are the Possible Causes of the DTC U01B0 Buick?

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 Buick?

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 Buick 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 U01B0 Buick Code

What does the OBDII code U01B0 mean for a Buick?

U01B0 indicates a lost communication with the Battery Monitor Module, which is responsible for monitoring the battery's status and performance.

What are common symptoms of the U01B0 code?

Common symptoms include warning lights on the dashboard, such as the battery light, erratic electrical system behavior, and difficulty starting the vehicle.

What could cause the U01B0 code to trigger?

Causes may include a faulty Battery Monitor Module, damaged wiring or connectors, a dead or weak battery, or issues with the vehicle's electrical system.

How can I diagnose the U01B0 code?

Start by checking the battery's condition and connections, inspect wiring and connectors for damage, and use a scan tool to review related codes and freeze frame data.

Is it safe to drive a vehicle with the U01B0 code?

While it may be safe to drive, it is advisable to address the issue promptly to prevent potential electrical problems or battery failure.

What repairs might be needed for the U01B0 code?

Repairs may involve replacing the Battery Monitor Module, repairing or replacing damaged wiring or connectors, or addressing issues with the battery itself.

Can I reset the U01B0 code after repairs?

Yes, after addressing the underlying issue, you can clear the code using an OBDII scanner. However, ensure the problem is resolved to prevent the code from returning.

How much does it typically cost to fix the U01B0 code?

Repair costs can vary widely depending on the issue, ranging from a simple battery replacement to more complex repairs involving the Battery Monitor Module or wiring.

What should I do if the U01B0 code keeps coming back?

If the code persists after repairs, consider consulting a professional technician for further diagnosis, as there may be underlying electrical system issues that need attention.