U01A3

Lost Communication With Hybrid/EV Battery Interface Control Module D

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$167–889 (est.)

Symptoms

Hybrid system does not activate
Dashboard warning lights (hybrid system, battery)
Reduced power or transition to emergency mode
Inability to charge high voltage battery
Increased fuel consumption (for hybrids)

Causes

Open or short circuit in the CAN/LIN bus wiring
Hybrid battery control module malfunction
Poor contact or corrosion in connectors
Blown module power fuse
Problems with module ground connection

How to Fix

Check fuses associated with the hybrid system
Inspect the battery module connectors and wiring for damage.
Check the condition of the ground and power supply of the module
Scan the battery module for additional fault codes
Repair only from an authorized dealer

Related codes

U01A0 U01A1 U01A2 U01A4