U01A8

Lost Communication With Hybrid/EV Battery Interface Control Module I

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$167–556 (est.)

Symptoms

Check Engine light comes on
The car goes into emergency mode
Reduced engine power
Battery charging problems
Inability to switch to electric mode

Causes

Open or short circuit in the CAN bus
Problems with power supply to the battery management module
Malfunction of the control module itself
Corroded or damaged connectors
Problems with the module software

How to Fix

Check the integrity of the CAN bus and wiring
Check the power and ground of the control module
Inspect connectors for corrosion or damage
Diagnose the battery control module
If necessary, replace the control module
Repair only from an authorized dealer

Related codes

U01A9 U01AA U0100