U01A1 Buick 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 Buick 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.
Code U01A1 Buick Description
What are the Possible Causes of the DTC U01A1 Buick?
- 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 Buick?
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 Buick 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 Buick code?
Need more information on how to fix the U01A1 Buick code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the U01A1 Buick code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about U01A1 Buick Code
What does the OBDII code U01A1 mean on a Buick?
The U01A1 code indicates a loss of communication with the Hybrid/EV Battery Interface Control Module 2, which manages specific functions of the hybrid or EV battery system.
What are the common symptoms of code U01A1 in a Buick?
Symptoms may include warning lights on the dashboard, reduced fuel efficiency, limited power mode, or the inability to start the vehicle in some cases.
What causes the U01A1 code to trigger in a Buick?
Common causes include faulty wiring or connectors, a malfunctioning Battery Interface Control Module 2, issues with the CAN bus communication network, or a dead hybrid/EV battery.
Can I drive my Buick with the U01A1 code active?
Driving is not recommended, as this code may indicate serious issues with the hybrid/EV battery system, which can lead to reduced performance or further damage.
How do I diagnose the U01A1 code in a Buick?
Inspection should start with checking the wiring and connectors for damage or corrosion, followed by testing the Battery Interface Control Module 2 and verifying communication on the CAN bus network.
How much does it cost to fix the U01A1 code on a Buick?
Repair costs vary but typically range from $150 to $1,000 depending on whether the issue is a wiring repair, module replacement, or more extensive system repairs.
Can a weak 12V battery cause the U01A1 code in a Buick?
Yes, a weak or failing 12V battery can cause communication issues, including the U01A1 code, as it may disrupt power to the control modules.
What tools are needed to diagnose the U01A1 code?
You’ll need an advanced OBDII scanner with CAN bus diagnostic capabilities, a multimeter for electrical testing, and possibly a wiring diagram for your Buick model.
Is the U01A1 code specific to hybrid and EV Buick models?
Yes, this code is specific to hybrid and electric Buick models, as it relates to the communication of components within the hybrid/EV battery system.
What should I do if the U01A1 code keeps coming back after repairs?
If the code persists, recheck the wiring and connections, verify module programming, and consult a professional technician to ensure all components are functioning correctly.
Discuss the causes and fixes for U01A1 Buick OBDII Code
Code U01A1 Buick comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
