U0544: Invalid Data Received From Parking Assist Control Module B

What it means

A receiving module detected implausible data from parking assist module B. Ultrasonic distance values or trajectory commands fail plausibility checks and are rejected, suspending automated parking.

How it works

Parking assist control module B processes parking-system inputs and may coordinate ultrasonic distance readings or automated-parking commands. Other modules check its reported distances and trajectory data for plausibility; this code sets when module B's data fails those checks and is rejected.

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 and communication details to identify which recipient logged U0544 and whether the rejected data concerns ultrasonic distances or parking trajectory commands.
2. Check live data for module B's distance readings and compare them with actual clearances around the vehicle while stationary.
3. Inspect the relevant ultrasonic sensors, bumpers, connectors, and wiring for dirt, damage, misalignment, loose pins, or corrosion.
4. Check service history for a recent parking-module, sensor, or bumper replacement or software update that may have left module B incorrectly configured.
5. Use network diagnostics to check CAN communication and gateway routing for module B, then test sensor inputs and trajectory data using the manufacturer's procedures.

Common fixes

• Clean the ultrasonic sensors used by parking assist module B and remove anything obstructing them.
• Repair damaged, loose, or corroded sensor or module wiring.
• Correct sensor alignment or module B configuration after a bumper, sensor, or module replacement.
• Repair or replace a faulty ultrasonic sensor if its readings are implausible.
• Repair or replace module B, or correct gateway routing, if testing identifies the fault there.

Can I keep driving?

Parking sensors or automated parking may be unavailable or may give unreliable distance information. Do not rely on the system to judge clearance; park manually and check the surroundings directly until the fault is repaired.