Invalid GPS Module Data Received
The U046B code indicates that a main control module (such as the PCM, BCM, or infotainment module) has received invalid, corrupt, or unrecognizable data from the GPS module over the CAN bus. This means the GPS module is transmitting location, speed, or time information that doesn't match the expected format or is out of range, as defined by SAE J2012 for communication errors in the U0400-U04FF range.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Internal GPS module failure (damaged receiver or antenna)
- Electromagnetic interference affecting the GPS signal
- Loose or corroded connector at the GPS module
- Damaged CAN bus wiring between the GPS module and the receiving module
- Outdated or corrupted software in the GPS module
- Faulty GPS antenna or physical obstruction blocking the signal
3. Symptoms You Will Notice
- Inaccurate or missing GPS location data
- Infotainment system displaying 'No GPS signal' or similar errors
4. Step-by-Step Diagnosis
Scan for other related codes and check for communication faults on the CAN bus.
Inspect the GPS antenna and its connection for damage or obstruction.
Check the GPS module connector for corrosion, loose pins, or bent terminals.
Test the CAN bus wiring between the GPS module and the receiving module for continuity and shorts.
Verify the GPS module's software version and update if necessary.
If all else fails, replace the GPS module.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive, but GPS-dependent features like navigation and emergency services may not work correctly.
How much does it cost to fix?▼
Diagnosis typically costs $100-$200. Repair costs vary: a new GPS module can range from $200 to $800, plus labor. Antenna replacement is usually $50-$150.