U01AB

Lost Communication With Hybrid/EV Battery Interface Control Module L

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$167–556 (est.)

Symptoms

Check Engine light comes on
The car goes into emergency mode
Reduced power or inability to use electric mode
Incorrect battery level display
Errors in other systems related to the hybrid installation

Causes

Broken or damaged CAN bus wires
Poor contact in battery control module connectors
Battery management module malfunction
Problems with module power supply (blown fuse)
Software error in control module

How to Fix

Check the integrity of the CAN bus and connections
Inspect the connectors and wires of the battery control module
Check fuses associated with the system
Scan the module for additional errors
If necessary, replace or reflash the control module
Repair only from an authorized dealer

Related codes

U01AA U01AC U0100