U01AA

Lost Communication With Hybrid/EV Battery Interface Control Module K

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$167–556 (est.)

Symptoms

Check Engine light comes on
Reduced vehicle power
Battery charging problems
The car goes into emergency mode
Inability to start the engine (on all-electric models)

Causes

Broken or damaged wires in the CAN bus
Battery management module malfunction
Module power problems
Contact corrosion
Software error in the module

How to Fix

Check the integrity of the CAN bus and connections
Check the power and ground of the control module
Scan the module for additional errors
If necessary, replace the battery management module
Update module software (if available)

Related codes

U01AB U01AC U0100