U01AF

Lost Communication With Hybrid/EV Battery Interface Control Module P

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 engine power
Battery charging problems
Inability to switch between driving modes

Causes

Open or short circuit in the CAN bus
Problems with power supply to the battery management module
Malfunction of the control module itself
Oxidation of contacts in 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 and clean connector contacts
Diagnose the battery control module
If necessary, replace the control module
Repair only from an authorized dealer

Related codes

U01A0 U01B0 U0100