U01AD

Lost Communication With Hybrid/EV Battery Interface Control Module N

Severity

🚨 Critical

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine light comes on
The car goes into emergency mode
Reduced power or inability to start
Errors in the hybrid/electric powertrain system
Inability to charge high voltage battery

Causes

Broken or damaged wires in the CAN bus
Battery management module malfunction
Control module power problems
Corrosion or poor contact in connectors
Software error or need for software update

How to Fix

Check the integrity of the CAN bus and wiring harness
Check power and grounding of the control module
Inspect connectors for corrosion or damage
Diagnose the battery control module
Update software if necessary
Repair only from an authorized dealer

Related codes

U01AE U01AF P0A80