Does anyone know about error code P1649-35-00?

Please help, I'm still having problems with my VW Passat 3BG 4Motion TDI.
After approximately 40-60 kilometers, the warning light for the handbrake or brake still comes on.
I found this error today, but what does it actually mean?

18057
DATA BUS, drive error message, ABS control unit.
P1649-35-00

Can someone help me?

"Thank you."

Check the CAN-Bus connection from the ABS to the engine control unit and to the speedometer.

Can you provide a little more detail about the vehicle?
What year is it, and what kind of TDI engine does it have?

Sure, here's the translation:

"So, it's a..."
VW Passat 1.9 TDI 130 hp All-wheel drive Sedan.
Year of manufacture: 2001, Model: 3BG.
I hope this helps.

Self-diagnosis of the engine control unit: check data block 125, or ABS detected while stationary.
If everything is okay so far, then check if there's a '0' displayed when a message appears during communication, and see if you can still access the ABS system through diagnostics.

It's likely either a loose connection (intermittent fault) in the CAN bus wiring or a power failure to the ABS/ESP module. However, if that's the case, you wouldn't be able to access the self-diagnosis function at that moment either.

I checked the 125 mark, and everything is okay; it's a zero.
The ABS control unit is being accessed, but no errors are visible or can be read.
Do you have any more information about this error?

If the ABS is accessible for diagnostic purposes, and the module shows a '0' indicating no communication, then you're in for a fun time troubleshooting the wiring.

Oh dear, please no. I hope he can be found.
I don't think it's a cable defect; I'm still hoping it's a problem with the circuit board.

Most of the time, it's more likely a connector issue than a cable problem, unless it's something like a weasel causing damage, which you would be able to see from the outside.