What it means
A receiving module detected implausible data from the GPS receiver module. Position, time or satellite-quality values fail plausibility checks and are rejected.
How it works
The GPS receiver module supplies position, time, and satellite-quality information to vehicle systems such as navigation. A receiving module sets U046B when GPS data fails plausibility checks and is rejected.
Common causes
Most likely first.
- Module internal fault or sensor input drift
- Software version mismatch after replacement
- 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
- Scan all modules and save freeze-frame and communication codes to identify which module rejected the GPS message.
- Compare live GPS position, time, and satellite-quality data with the vehicle's actual location and whether it has a clear view of the sky.
- Inspect the GPS antenna, its cable, and module connectors for looseness, damage, or water intrusion.
- Check for related CAN or gateway faults and note whether navigation or other systems also report loss of GPS data.
- If the antenna, wiring, and network are sound, verify receiver operation and software compatibility using the manufacturer's procedure.
Common fixes
- Reconnect or repair a loose or damaged GPS antenna cable.
- Repair corroded or damaged GPS module connector terminals.
- Correct module software or configuration after replacement.
- Replace a faulty GPS antenna or receiver module if testing confirms the fault.
- Repair a gateway or CAN network issue affecting GPS messages.
Can I keep driving?
Driving is generally safe if the vehicle otherwise operates normally, but navigation and any location-dependent features may be unreliable. Use road signs and other reliable directions rather than relying on a position that may be incorrect.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.