U044B: Invalid Data Received From Battery Energy Control Module C

What it means

A receiving module detected implausible data from battery energy control module C. SoC, SoH, current or voltage values fail plausibility checks against other inputs and are rejected.

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

A receiving module checks messages from battery energy control module C about battery state, health, current, or voltage. U044B sets when one or more of those reported values fail plausibility checks against other vehicle data and are rejected; the code does not by itself confirm a failed battery or control module.

Common causes

Most likely first.

1. Module internal fault or sensor input drift
2. Software version mismatch after replacement
3. Gateway module routing CAN messages incorrectly

Symptoms

• Multiple warning lights may illuminate
• Affected modules may go into limp mode or shut down
• Specific functions inoperative depending on module
• Diagnostic tools may show communication faults

How to diagnose it

1. Scan all modules and record freeze-frame data, battery-related codes, and the reporting module to see which reported value was considered implausible.
2. Check the vehicle’s battery warnings and operating behavior, and note whether charging, power delivery, or range indications changed when the code appeared.
3. Inspect battery energy control module C connectors and accessible low-voltage wiring for damage, loose connections, corrosion, or signs of recent service.
4. Compare battery state, voltage, current, and temperature data from module C with other available module readings and the conditions recorded in freeze-frame data.
5. If the battery or control module was recently serviced or replaced, verify the required software compatibility and configuration.
6. Have high-voltage battery circuits and module power, grounds, and network wiring tested using the manufacturer’s procedures and specifications; do not probe high-voltage components without proper training.

Common fixes

• Repair a loose or corroded connector or low-voltage wire at battery energy control module C.
• Correct a faulty sensor input or connection that is producing implausible battery data.
• Restore compatible software and configuration after battery or module replacement.
• Repair a confirmed module power, ground, or network fault.
• Replace battery energy control module C only when testing confirms an internal fault.

Can I keep driving?

If a battery warning, reduced power, abnormal charging behavior, or a high-voltage system warning appears, stop safely and follow the vehicle’s instructions; do not open or probe the high-voltage battery system. Otherwise, limit driving and arrange prompt diagnosis because invalid battery data can affect power management.