Engine-Codes.com
Engine-Codes – GMC – U01A1 2017 GMC Sierra

U01A1 2017 GMC Sierra Code - Lost Communication with Hybrid/EV Battery Interface Control Module 2

Quick Answer

The U01A1 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there is a communication issue with the Hybrid/EV Battery Interface Control Module 2. Common causes include Loose or Corroded Wiring: A common cause of this code is loose or corroded wiring connections that prevent proper communication with the control module, Faulty Control Module: The Hybrid/EV Battery Interface Control Module 2 itself may be malfunctioning, leading to a loss of communication, Water Damage: Exposure to water or moisture can damage the wiring or connectors, causing communication issues. 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 2017 GMC Sierra indicates Lost Communication with Hybrid/EV Battery Interface Control Module 2.
Common causes
Common causes include Loose or Corroded Wiring: A common cause of this code is loose or corroded wiring connections that prevent proper communication with the control module, Faulty Control Module: The Hybrid/EV Battery Interface Control Module 2 itself may be malfunctioning, leading to a loss of communication, Water Damage: Exposure to water or moisture can damage the wiring or connectors, causing communication issues.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code U01A1 2017 GMC Sierra Description

The U01A1 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there is a communication issue with the Hybrid/EV Battery Interface Control Module 2. This module is responsible for managing the flow of information between the vehicle's hybrid or electric battery system and the rest of the vehicle's electronic control units. When communication is lost with this module, it can lead to a range of performance issues and potentially affect the overall operation of the hybrid or electric system in the vehicle.

OBDII Code U01A1 2017 GMC Sierra - Lost Communication with Hybrid/EV Battery Interface Control Module 2
U01A1 2017 GMC Sierra Code - Lost Communication with Hybrid/EV Battery Interface Control Module 2

Common Causes of U01A1 2017 GMC Sierra

  1. Loose or Corroded Wiring: A common cause of this code is loose or corroded wiring connections that prevent proper communication with the control module.
  2. Faulty Control Module: The Hybrid/EV Battery Interface Control Module 2 itself may be malfunctioning, leading to a loss of communication.
  3. Water Damage: Exposure to water or moisture can damage the wiring or connectors, causing communication issues.
  4. Electrical Interference: External factors such as electromagnetic interference can disrupt communication between the module and other components.

Symptoms of U01A1 2017 GMC Sierra

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: Loss of communication with the battery interface control module can lead to reduced fuel efficiency as the hybrid or electric system may not be operating as efficiently as intended.
  3. Loss of Power: The vehicle may experience a loss of power or responsiveness, especially in electric mode.
  4. Inability to Operate in Electric Mode: If the hybrid or electric system is affected, the vehicle may not be able to operate in electric mode at all.

How to Fix U01A1 2017 GMC Sierra

  1. Visual Inspection: Start by visually inspecting the wiring harnesses and connectors for any signs of damage, corrosion, or loose connections.
  2. Test Wiring Continuity: Use a multimeter to test the continuity of the wiring connections to ensure they are functioning properly.
  3. Check Control Module: Test the Hybrid/EV Battery Interface Control Module 2 for faults or malfunctions using a diagnostic scanner.
  4. Repair or Replace: Repair any damaged wiring or connectors, and replace the control module if necessary to restore communication.
  5. Clear Codes: After making the necessary repairs, clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix U01A1 2017 GMC Sierra

The cost of repairing a U01A1 code on a 2017 GMC Sierra can vary depending on the extent of the issue and the specific repairs needed. In general, the cost of parts for this repair can range from $200 to $800, with labor costs adding an additional $100 to $200. Overall, the total repair cost can range from $300 to $1000 or more, depending on the severity of the problem and the rates charged by the auto repair shop.

Need more information about the U01A1 2017 GMC Sierra code?

Need more information on how to fix the U01A1 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U01A1 2017 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 2017 GMC Sierra Code

1. What does OBDII code U01A1 mean on a 2017 GMC Sierra?

Code U01A1 indicates a loss of communication with Hybrid/EV Battery Interface Control Module 2, meaning the vehicle's control modules cannot communicate with this critical component.

2. What are the common symptoms of code U01A1 on a 2017 GMC Sierra?

Symptoms may include warning lights on the dashboard, reduced fuel efficiency, limited hybrid/EV functionality, or complete loss of hybrid operation.

3. What causes the U01A1 code to appear on a 2017 GMC Sierra?

Common causes include faulty wiring or connectors, a malfunctioning Hybrid/EV Battery Interface Control Module 2, or issues with the CAN (Controller Area Network) communication system.

4. Can a dead battery cause the U01A1 code in a 2017 GMC Sierra?

Yes, a weak or dead battery can disrupt communication between control modules, potentially triggering the U01A1 code.

5. How do you diagnose a U01A1 code on a 2017 GMC Sierra?

Begin with a visual inspection of the wiring and connectors related to Module 2. Use a scan tool to check for additional codes and monitor CAN communication signals.

6. Can driving with a U01A1 code damage my 2017 GMC Sierra?

Driving with this code can cause reduced performance and may strain the hybrid/EV system, potentially leading to further damage if not addressed.

7. How is the U01A1 code fixed on a 2017 GMC Sierra?

Repairs typically include fixing or replacing damaged wiring or connectors, reprogramming or replacing the Hybrid/EV Battery Interface Control Module 2, or resolving CAN network issues.

8. Is the U01A1 code specific to hybrid or EV systems on a 2017 GMC Sierra?

Yes, this code specifically relates to the hybrid or EV battery system and its communication with the control modules.

9. How much does it cost to repair a U01A1 code on a 2017 GMC Sierra?

Repair costs vary depending on the issue, but they can range from $150 for wiring repairs to over $1,000 for module replacement and reprogramming.

10. Is it safe to clear the U01A1 code without repairs on a 2017 GMC Sierra?

Clearing the code without addressing the root cause may temporarily remove the warning, but the issue will likely return and may worsen over time.

Discuss the causes and fixes for U01A1 2017 GMC Sierra OBDII Code

Submit a New Comment

Code U01A1 2017 GMC Sierra comments

No comments found for this page.