U04C0: Invalid Data Received From Battery Management Control Module

What it means

A control module received invalid data from the battery management control module. The code identifies a data validity fault; the specific affected function depends on the vehicle.

At a glance

• Usually lights the warning light of the system that lost communication
• The engine or gearbox may go into limp mode

How it works

The battery management control module monitors the vehicle battery and sends battery status data to other modules. U04C0 sets when a receiving module judges that data invalid, so battery-dependent functions or vehicle operation may be restricted.

Common causes

Most likely first.

1. Fault in the transmitting module
2. Network wiring or connector fault
3. Module power or ground fault
4. Software or configuration mismatch

Symptoms

• Battery or charging-system warnings may appear
• Battery-dependent vehicle functions may be limited

How to diagnose it

1. Save freeze-frame information and scan all modules for battery, charging, and communication codes to determine whether the battery management module has related faults.
2. Check live data for battery status values and communication availability, noting which reported values are missing, implausible, or flagged invalid.
3. Inspect the battery management module's connectors and network wiring for corrosion, water intrusion, loose terminals, or damage.
4. Check module power and ground connections using the manufacturer's procedure, since unstable supply can disrupt battery data.
5. If connections are sound, verify module software and configuration for the vehicle, then test the module only after network and supply faults are excluded.

Common fixes

• Clean and secure a loose or corroded battery management module connector.
• Repair damaged network wiring between the battery management module and vehicle network.
• Correct a poor power or ground connection to the module.
• Update or correct module software or configuration when applicable.
• Replace the battery management module if testing confirms it is faulty.

Can I keep driving?

With battery-dependent functions potentially limited, avoid long trips and pay attention to battery or charging warnings. If the vehicle reports a hybrid or battery fault, loses power, or behaves unpredictably, stop safely and have it checked.