AutoCodes – GMC – U01A1 2015 GMC Sierra

U01A1 2015 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 2015 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 261

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 2015 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 2015 GMC Sierra - Lost Communication with Hybrid/EV Battery Interface Control Module 2 - AutoCodes.com — U01A1 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the U01A1 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U01A1 2015 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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code U01A1 in a 2015 GMC Sierra related to "Lost Communication with Hybrid/EV Battery Interface Control Module 2"?

- Common symptoms include warning lights on the dashboard, loss of power steering, issues with the hybrid or electric drive system, and potential stalling of the vehicle.

2. What are the possible causes of the U01A1 OBDII code in a 2015 GMC Sierra?

- The code may be triggered by damaged wiring, loose connections, a faulty Hybrid/EV Battery Interface Control Module 2, software issues, or a malfunction in the communication network.

3. How can I diagnose the cause of the U01A1 code in my 2015 GMC Sierra?

- Diagnosing the issue may involve checking the wiring and connections associated with the Hybrid/EV Battery Interface Control Module 2, conducting a scan tool diagnostic, and verifying the software integrity.

4. Can I still drive my 2015 GMC Sierra with the U01A1 code present?

- It is not recommended to drive the vehicle with the U01A1 code active, as it can lead to further issues with the hybrid or electric drive system and potentially affect the overall performance and safety of the vehicle.

5. How can I repair the "Lost Communication with Hybrid/EV Battery Interface Control Module 2" issue in my 2015 GMC Sierra?

- Repairing the issue may involve checking and repairing any damaged wiring or connections, replacing the Hybrid/EV Battery Interface Control Module 2 if necessary, updating software, and clearing the trouble codes.

6. Is it possible to reset the U01A1 code in a 2015 GMC Sierra without repairing the issue?

- While you can clear the code using an OBDII scanner, it is essential to address the root cause of the problem to prevent the code from reoccurring and ensure the proper functioning of the vehicle.

7. Can a DIY enthusiast fix the U01A1 code issue in a 2015 GMC Sierra?

- Depending on the complexity of the problem, some DIY enthusiasts may be able to address wiring issues or connections. However, diagnosing and repairing issues related to the Hybrid/EV Battery Interface Control Module 2 may require specialized knowledge and tools.

8. How much does it typically cost to repair the U01A1 code issue in a 2015 GMC Sierra at a dealership?

- Repair costs can vary depending on the exact cause of the problem and the labor rates at the dealership. It is advisable to get a diagnostic assessment first to understand the scope of the repair needed.

9. Are there any recalls or technical service bulletins related to the U01A1 code in a 2015 GMC Sierra?

- It is recommended to check with your local GMC dealership or visit the NHTSA website to see if there are any related recalls or technical service bulletins for the specific issue with the Hybrid/EV Battery Interface Control Module 2.

10. How often does the U01A1 code occur in a 2015 GMC Sierra, and is it a common issue?

- The occurrence of the U01A1 code can vary, but it is not considered a common issue in the 2015 GMC Sierra. However, proper maintenance and regular checks of the hybrid and electric components can help prevent such communication errors.