AutoCodes – GMC – U01A1 2016 GMC Sierra

U01A1 2016 GMC Sierra Code - Lost Communication with Hybrid/EV Battery Interface Control Module 2

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: U01A1 2016 GMC Sierra indicates Lost Communication with Hybrid/EV Battery Interface Control Module 2.
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 168

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 U01A1 2016 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 2 for more than 4.5 s.

OBDII Code U01A1 2016 GMC Sierra - Lost Communication with Hybrid/EV Battery Interface Control Module 2 - AutoCodes.com — U01A1 2016 GMC Sierra Code - Lost Communication with Hybrid/EV Battery Interface Control Module 2

What does this mean?

What are the Possible Causes of the DTC U01A1 2016 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 U01A1 2016 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 U01A1 2016 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 U01A1 2016 GMC Sierra code?

Need more information on how to fix the U01A1 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U01A1 2016 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 U01A1 2016 GMC Sierra Code

1. What does the OBDII code U01A1 on a 2016 GMC Sierra mean?

The code U01A1 indicates a "Lost Communication with Hybrid/EV Battery Interface Control Module 2" error on a 2016 GMC Sierra.

2. What are the common symptoms of the U01A1 code in a 2016 GMC Sierra?

Common symptoms of the U01A1 code may include a check engine light, hybrid system warning lights, reduced hybrid system performance, and potential drivability issues.

3. What are the possible causes of the U01A1 code in a 2016 GMC Sierra?

Possible causes of the U01A1 code include damaged wiring, loose connections, a faulty Hybrid/EV Battery Interface Control Module 2, software issues, or a malfunctioning hybrid system component.

4. How can I diagnose the U01A1 code on my 2016 GMC Sierra?

Diagnosing the U01A1 code may require using a professional OBDII scanner to retrieve the specific details of the error, checking the hybrid system components for physical damage, and inspecting the wiring and connections related to the Hybrid/EV Battery Interface Control Module 2.

5. Can I drive my 2016 GMC Sierra with the U01A1 code present?

It is not recommended to drive your 2016 GMC Sierra with the U01A1 code present, as it can lead to potential hybrid system malfunctions and affect the vehicle's overall performance and safety.

6. How do I repair the U01A1 code on my 2016 GMC Sierra?

Repairing the U01A1 code may involve fixing any damaged wiring or connections, replacing the faulty Hybrid/EV Battery Interface Control Module 2 if necessary, updating software, and clearing the error code with a diagnostic tool.

7. Is it safe to clear the U01A1 code without fixing the underlying issue?

Clearing the U01A1 code without addressing the underlying problem may temporarily turn off the check engine light, but it will not resolve the potential issues with the hybrid system, which can lead to further complications.

8. Can a DIY enthusiast fix the U01A1 code issue on a 2016 GMC Sierra?

While some basic checks like inspecting wiring and connections can be done by a DIY enthusiast, diagnosing and repairing the U01A1 code related to the hybrid system in a 2016 GMC Sierra may require specialized tools and expertise best handled by a professional technician.

9. What should I do if the U01A1 code keeps coming back on my 2016 GMC Sierra?

If the U01A1 code keeps reappearing after clearing it, it indicates a persistent issue that requires thorough diagnosis by a qualified mechanic to address the root cause effectively.

10. Is the repair for the U01A1 code covered under warranty for a 2016 GMC Sierra?

Depending on the specific circumstances, such as the vehicle's warranty status and the cause of the issue, repairs for the U01A1 code on a 2016 GMC Sierra may be covered under warranty. It is advisable to consult with a GMC dealership or service center for more information.