AutoCodes – Chevrolet – U01A0 Chevrolet

U01A0 Chevrolet 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 Chevrolet 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 224

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 Chevrolet 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 Chevrolet - Lost Communication with Hybrid/EV Battery Interface Control Module 1 - AutoCodes.com — U01A0 Chevrolet Code - Lost Communication with Hybrid/EV Battery Interface Control Module 1

What does this mean?

What are the Possible Causes of the DTC U01A0 Chevrolet?

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 Chevrolet?

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 Chevrolet 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.

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Information for Specific Chevrolet Models

U01A0 2014 Chevrolet Silverado — Lost Communication with Hybrid/EV Battery Interface Control Module 1
U01A0 2015 Chevrolet Silverado — Lost Communication with Hybrid/EV Battery Interface Control Module 1
U01A0 2016 Chevrolet Silverado — Lost Communication with Hybrid/EV Battery Interface Control Module 1
U01A0 2017 Chevrolet Silverado — Lost Communication with Hybrid/EV Battery Interface Control Module 1
U01A0 2018 Chevrolet Silverado — Lost Communication with Hybrid/EV Battery Interface Control Module 1

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 Chevrolet Code

1. What does the OBDII code U01A0 mean on a Chevrolet?

U01A0 indicates a lost communication issue with the Hybrid/EV Battery Interface Control Module 1, meaning the module is not properly communicating with other vehicle systems.

2. What are common symptoms of code U01A0 in a Chevrolet?

Common symptoms include warning lights on the dashboard, reduced engine performance, failure to start, or issues with hybrid/EV battery charging and operation.

3. What causes the U01A0 code to appear?

The code can be triggered by faulty wiring or connectors, a failed Hybrid/EV Battery Interface Control Module, a software glitch, or a failure in the CAN (Controller Area Network) communication system.

4. Can a weak 12-volt battery cause the U01A0 code?

Yes, a weak or failing 12-volt battery can disrupt communication between modules, potentially triggering the U01A0 code.

5. How do you diagnose the U01A0 code on a Chevrolet?

Diagnosis typically involves using a scan tool to check for related codes, inspecting wiring and connectors for damage, and testing the Hybrid/EV Battery Interface Control Module.

6. Is the U01A0 code serious?

Yes, it can be serious, as it impacts communication with the hybrid/EV battery, which may lead to reduced performance, safety concerns, or inability to drive the vehicle.

7. Can driving with the U01A0 code damage my Chevrolet?

Continuing to drive with this code could potentially cause further damage to the hybrid/EV system or leave you stranded if the vehicle fails to start.

8. What repairs can fix the U01A0 code?

Repairs may include repairing or replacing damaged wiring or connectors, reprogramming or replacing the Hybrid/EV Battery Interface Control Module, or addressing CAN bus issues.

9. Can I clear the U01A0 code without fixing the problem?

Clearing the code without addressing the underlying issue will likely result in the code returning, as the communication problem will persist.

10. How much does it cost to fix the U01A0 code on a Chevrolet?

Repair costs vary depending on the root cause, ranging from $100 for minor wiring repairs to over $1,000 if the Hybrid/EV Battery Interface Control Module needs replacement.