U045D: Invalid Data Received From Automated Driving System Control Module A

What it means

A receiving module detected implausible data from automated driving system (ADS) control module A. Trajectory plan, perception fusion or actuator commands fail plausibility checks and are rejected; automated mode degrades or hands back to the driver.

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 receiving module checks messages from automated driving system (ADS) control module A, which can provide trajectory, perception, or actuator-command data. U045D sets when those messages fail plausibility checks and are rejected, so automated driving functions may degrade or hand control back to the driver.

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 save freeze-frame data to identify which module logged U045D and whether ADS, sensor, or communication faults were recorded at the same time.
2. Review live data from ADS control module A for trajectory, perception-fusion, and actuator-command values that are missing, implausible, or inconsistent with vehicle conditions.
3. Inspect module A's connectors, wiring, power, and grounds, and check its associated sensor connections for damage, loose terminals, or water intrusion.
4. Check whether the issue followed an ADS module replacement or software update, then verify module A's vehicle configuration and software compatibility.
5. If invalid messages persist, check CAN communication and gateway routing before testing module A and its inputs using the manufacturer's diagnostic procedure.

Common fixes

• Repair damaged or poorly seated module A connectors or wiring.
• Correct an ADS software or configuration mismatch following replacement or an update.
• Repair a faulty sensor input or its circuit if testing identifies the source of implausible data.
• Repair CAN network or gateway routing faults affecting ADS module A messages.
• Replace ADS control module A if its internal fault is confirmed.

Can I keep driving?

Do not rely on automated driving functions while this fault is active; be ready to take control and follow any handover alert immediately. If the system cannot be safely disengaged or vehicle behavior is abnormal, stop safely and arrange assistance.