U04A9

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

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$167–556 (est.)

Symptoms

The Check Engine or Hybrid light is on
The car goes into emergency mode
Reduced power or performance
Problems charging the hybrid battery
Error message on the dashboard

Causes

Hybrid battery control module malfunction
Damage to the interface wiring harness
Control module power problems
Corrosion or poor contact in connectors
Software error or outdated module software

How to Fix

Hybrid Battery Control Module Diagnostics
Checking the continuity and voltage in the wiring harness
Inspecting and cleaning connector contacts
Module software update
Replacing the control module if necessary
Repair only from an authorized dealer

Related codes

U04A8 U04AA U04AB