2013 Sequoia Argument Null error help!!!

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02-17-2025
e30cabrio

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2013 Sequoia Argument Null error help!!!

I have been tuning my Sequoia for 3+ years no issues, yesterday I tried to write a new tune & got Argument Null. I have my truck on a charger, the battery is at 12.5v prior to tuning, I have an MPVI2 and have tried 4 computers, one with beta installed because of this, I have tried 4 different quality cables, have excellent wifi & tried running an ethernet cable, with wifi, I have a minimum of 70Mb, on the cable it was over 200Mb.

I created a ticket but I assume HPT are closed as it's Potus day.

Please help
02-17-2025
abc

Maybe the file is corrupt? Have you tried writing a known good .HPT file?
02-17-2025
e30cabrio

Yes, I tried flashing the current tune, same error.
02-18-2025
abc

It looks like it's not seeing the ECM? Are you able to connect and get a log file?

Have you tried writing calibration only? Try it without the battery charger on?
02-18-2025
e30cabrio

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I have tried it with & without the charger, I can process all other functions, also, I am not the only one this is happening to, several people on the Tundra forum are seeing this. Guess I have to wait for HPT to get to my ticket.

It was suggested it might be a location issue so I tried on the VPN, nope, also, it sees the ECM Vin, model, OS info.
02-21-2025
e30cabrio

Somehow, it seems the OS changed on my file, the solution was a new tune on a new read.
02-22-2025
LilSick

well that's fkn scary
02-22-2025
e30cabrio

It's freaking weird but it's fixed & I'm good to go.
02-26-2025
Dnlharms

I'm having the exact same issue with my 2014 tundra. It worked fine this morning, then I wanted to make a revision but it keeps getting stuck at the processing data stage of the write process and saying argument null.
Would you mind walking me through how you fixed this? I can't get any of my tunes to write to the pcm.
02-26-2025
Dnlharms

Quote:

Originally Posted by Dnlharms

I'm having the exact same issue with my 2014 tundra. It worked fine this morning, then I wanted to make a revision but it keeps getting stuck at the processing data stage of the write process and saying argument null.
Would you mind walking me through how you fixed this? I can't get any of my tunes to write to the pcm.