U0544: Invalid Data from Parking Assist Module B
The U0544 code indicates that the main control module (ECM/PCM) has received invalid, corrupt, or out-of-range data from the parking assist module 'B' over the CAN communication bus. Per SAE J2012, U05xx codes denote data network communication faults between modules. The 'B' suffix identifies a secondary or duplicate module in systems with multiple parking assist modules. This condition is triggered when transmitted data fails to meet the expected format, checksum, or range, even though physical communication is present.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Internal failure of the parking assist module 'B'
- Electromagnetic interference on the CAN bus
- Corrosion or damage to the parking assist module connectors
- Voltage fluctuation or poor ground at the transmitting module
- Outdated or corrupted software in the parking assist module
- Faulty ECM/PCM misinterpreting valid data
- Aftermarket modifications to the parking assist system
3. Symptoms You Will Notice
- Parking assist system inoperative or erratic
- Check Engine Light or warning message on dash
4. Step-by-Step Diagnosis
Scan for all stored codes and freeze frame data
Inspect CAN bus wiring and connectors for damage or corrosion
Check voltage and ground at parking assist module B
Test module communication using a scan tool
Update or reprogram parking assist module software if applicable
Replace parking assist module B if internal failure is confirmed
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive, but parking assist features will be disabled. Have it diagnosed soon to avoid potential communication issues affecting other systems.
How much does it cost to fix?▼
Diagnosis typically costs $100-$150. Module replacement ranges from $300 to $800 including parts and labor, depending on vehicle make and model.