U04A3

Invalid Data Received From Hybrid/EV Battery Interface Control Module C

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine light comes on
Reduced vehicle power
Switching to emergency mode
Battery charging problems
Error message on the dashboard

Causes

Problems with the CAN bus
Broken or damaged wiring to the battery control module
Battery control module C fault
Control module power problems
Corrosion of contacts or connectors

How to Fix

Check the integrity of the wiring and connectors to the battery control module
Check the state of the CAN bus and its terminators
Read additional trouble codes for accurate diagnosis
Check power and grounding of the control module
Repair only from an authorized dealer

Related codes

U04A1 U04A2 U04A4