AutoCodes – GMC – U01A0 2018 GMC Sierra

U01A0 2018 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 2018 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 173

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
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Code U01A0 2018 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 2018 GMC Sierra - Lost Communication with Hybrid/EV Battery Interface Control Module 1 - AutoCodes.com — U01A0 2018 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 2018 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 2018 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 2018 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 2018 GMC Sierra code?

Need more information on how to fix the U01A0 2018 GMC Sierra code? Get Access to Factory Service Manuals

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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 U01A0 2018 GMC Sierra Code

What does the OBDII code U01A0 mean on a 2018 GMC Sierra?

The U01A0 code indicates a loss of communication with Hybrid/EV Battery Interface Control Module 1, meaning the vehicle cannot communicate with this critical component.

What are the common symptoms of code U01A0 in a 2018 GMC Sierra?

Symptoms may include warning lights on the dashboard (e.g., check engine or hybrid system warning), reduced fuel efficiency, limited hybrid functionality, or the vehicle entering limp mode.

What causes the U01A0 code in a 2018 GMC Sierra?

Common causes include faulty wiring or connections, a malfunctioning Hybrid/EV Battery Interface Control Module 1, a failing powertrain control module (PCM), or software-related communication issues.

Can a bad battery cause the U01A0 code?

Yes, a failing hybrid or EV battery can cause communication problems with the control module, potentially triggering the U01A0 code.

How can I diagnose the U01A0 code in my 2018 GMC Sierra?

Start by inspecting wiring and connectors to the Hybrid/EV Battery Interface Control Module 1. Use a scan tool to check for additional codes and confirm if the module is responsive during a diagnostic test.

Is the U01A0 code serious?

Yes, it can be serious because it affects the hybrid/EV battery system, potentially leading to reduced performance or safety concerns if left unaddressed.

Can I drive my 2018 GMC Sierra with the U01A0 code present?

Driving with this code is not recommended, as it may limit hybrid functionality, cause poor performance, or lead to further damage if the issue worsens.

How is the U01A0 code fixed on a 2018 GMC Sierra?

Repairs may include replacing damaged wiring, repairing or replacing the Hybrid/EV Battery Interface Control Module 1, updating software, or addressing powertrain control module (PCM) issues.

What tools are needed to fix the U01A0 code?

A diagnostic scan tool capable of reading hybrid system codes, a multimeter for checking wiring continuity, and potentially programming tools for module updates may be required.

Does the U01A0 code require professional repair?

While basic inspections can be done at home, diagnosing and repairing communication issues often requires specialized equipment and expertise, so professional repair is usually recommended.