AutoCodes – GMC – U01A0 2014 GMC Sierra

U01A0 2014 GMC Sierra Code - Lost Communication with Hybrid/EV Battery Interface Control Module 1

Quick Answer

This diagnostic monitors the internal battery communication status between the Hybrid/EV Powertrain Control Module 2 and the Hybrid/EV Battery Interface Control Modules. Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface 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: U01A0 2014 GMC Sierra indicates Lost Communication with Hybrid/EV Battery Interface Control Module 1.
Common causes: Common causes include Faulty Hybrid/EV Battery Interface Control Module, Hybrid/EV Battery Interface Control Module harness is open or shorted, Hybrid/EV Battery Interface 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 205

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 Jul 21, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U01A0 2014 GMC Sierra Description

This diagnostic monitors the internal battery communication status between the Hybrid/EV Powertrain Control Module 2 and the Hybrid/EV Battery Interface Control Modules. The diagnostic monitors Hybrid/EV Battery Interface Control Modules data availability whenever this private communications bus is active. The communication network between Hybrid/EV Powertrain Control Module 2 and Hybrid/EV Battery Interface Control Modules is in a daisy-chain architecture. Therefore, a break at any point in the communication bus results in a loss of Hybrid/EV Battery Interface Control Modules communication with the Hybrid/EV Powertrain Control Module 2. If any data is received, the diagnostic will report a pass. If no data is received for greater than 4.5 s, the Hybrid/EV Powertrain Control Module 2 will attempt to initiate the Hybrid/EV Battery Interface Control Modules into a communication mode where the Hybrid/EV Battery Interface Control Modules can perform their own internal communication loop back, bypassing the daisy-chain. If this is the first Hybrid/EV Battery Interface Control Module in the daisy-chain that the Hybrid/EV Powertrain Control Module 2 cannot re-establish communication with, this diagnostic will fail. The Diagnostic Trouble Code (DTC) will be set when the Hybrid/EV Powertrain Control Module 2 has not received data from the Hybrid/EV Battery Interface Control Module 1 for more than 4.5 s.

OBDII Code U01A0 2014 GMC Sierra - Lost Communication with Hybrid/EV Battery Interface Control Module 1 - AutoCodes.com — U01A0 2014 GMC Sierra Code - Lost Communication with Hybrid/EV Battery Interface Control Module 1

What does this mean?

What are the Possible Causes of the DTC U01A0 2014 GMC Sierra?

Faulty Hybrid/EV Battery Interface Control Module
Hybrid/EV Battery Interface Control Module harness is open or shorted
Hybrid/EV Battery Interface Control Module circuit poor electrical connection

How to Fix the DTC U01A0 2014 GMC Sierra?

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 U01A0 2014 GMC Sierra 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 U01A0 2014 GMC Sierra code?

Need more information on how to fix the U01A0 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U01A0 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 U01A0 2014 GMC Sierra Code

What does the OBDII code U01A0 mean on a 2014 GMC Sierra?

The U01A0 code indicates a loss of communication with the Hybrid/EV Battery Interface Control Module 1, which is responsible for managing data between the hybrid/EV battery system and other vehicle components.

What are the common symptoms of the U01A0 code in a 2014 GMC Sierra?

Common symptoms include warning lights on the dashboard, reduced hybrid/EV system performance, failure to start, or abnormal battery behavior.

What causes the U01A0 code on a 2014 GMC Sierra?

Possible causes include damaged wiring or connectors, a malfunctioning Hybrid/EV Battery Interface Control Module, or a failure in the CAN (Controller Area Network) communication system.

Can a dead battery trigger the U01A0 code on a 2014 GMC Sierra?

Yes, a weak or dead 12V battery can lead to communication issues and potentially trigger the U01A0 code.

How can I diagnose the U01A0 code in my 2014 GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion. Then use a scan tool to check for other communication-related codes and test the module's functionality.

Is the U01A0 code specific to hybrid or EV models of the 2014 GMC Sierra?

Yes, this code specifically relates to hybrid or EV systems that feature a Hybrid/EV Battery Interface Control Module.

Can I drive my 2014 GMC Sierra with the U01A0 code active?

Driving with this code active can lead to reduced performance or further damage to the hybrid/EV system, so itâ€™s best to address the issue promptly.

How much does it cost to repair the U01A0 code on a 2014 GMC Sierra?

Repair costs can vary widely depending on the issue, ranging from $100 for minor wiring repairs to over $1,000 if the control module requires replacement.

What tools are needed to troubleshoot the U01A0 code on a 2014 GMC Sierra?

Youâ€™ll need a scan tool capable of reading manufacturer-specific codes and diagnosing CAN communication issues, as well as basic tools to inspect wiring and connectors.

Can resetting the code fix the U01A0 issue on a 2014 GMC Sierra?

Resetting the code may temporarily clear it, but if the underlying problem isnâ€™t fixed, the code will likely return.