OBD2 Code U045A: Invalid Park Assist Data
The U045A code indicates that the main control module (PCM/ECM or body control module) has received invalid, corrupt, or implausible data from the Park Assist Module A. This diagnostic trouble code (DTC) falls under the SAE J2012 standard for network communication codes (Class U). The fault means the data transmitted over the communication bus (such as CAN, LIN, or SCP) does not meet the expected parameters, typically because the park assist module is sending out-of-range or incorrectly formatted data.
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 Park Assist Module A (PAM)
- Communication bus wiring shorted, open, or with high resistance
- Poor connections or corroded terminals at the park assist module connector
- Electromagnetic interference (EMI) affecting the communication network
- Outdated or corrupted software in the Park Assist Module A
- Low battery voltage or charging system fault causing module resets or erroneous transmission
3. Symptoms You Will Notice
- Park assist system inoperative or intermittent
- Check Engine Light or Service Park Assist warning on
4. Step-by-Step Diagnosis
Scan for all stored codes and freeze frame data
Inspect the park assist module connector for corrosion, bent pins, or damage
Check communication bus wiring for shorts, opens, or high resistance
Test battery voltage and charging system output
Update or reprogram the Park Assist Module A software if applicable
If all else fails, replace the Park Assist Module A
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive, but the park assist system will not function. Have the issue diagnosed soon to prevent potential communication problems with other modules.
How much does it cost to fix?▼
Diagnosis typically costs $100-$150. If the park assist module needs replacement, parts and labor can range from $300 to $800, depending on the vehicle.