ECU master reset!

Nbk4t5e · Mar 12, 2021

So we pick up our ST from the dealer this evening and my wife calls me while driving and says WTF it’s slow now. It came in because I had a bad LED in the cup holder and the main screen kept freezing. So they performed a master ECU reboot!! I called them and they said the transmission and all the different modes need to relearn themselves and calibrate over time... and can take up to 300 miles. Has anyone heard of this. They mentioned Ford has the ability to reset without learning but dealers do not.

I’ve done a few cycles and the power seems to be slowing coming back. But damn!

Sent from my iPhone using Tapatalk

zdubyadubya · Mar 13, 2021

Did you have a tune before? Are you saying that they wiped your tune and reverted the vehicle back to stock?

When the vehicle is brand new, the ECU throttles it for the first 500 miles so you can break in the engine... does the ECU now think the vehicle is brand new? If they did that, that means it would have wiped EVERYTHING... thats crazy. I had no idea they could do that...

Nbk4t5e · Mar 13, 2021

zdubyadubya said:

No tune but yup back to a brand new out of the box. Wiped everything.

Sent from my iPhone using Tapatalk

Papy_Yosh · May 25, 2021

That is interesting, I have heard of resetting the ECU by just unplugging the battery and making the + and - cables touch each other bypassing the battery. I know that it resets the transmission and other control units, and that you have to give a 30 miles or so for the system to relearn the baseline. I never had the issue of having the car(s) to go back to the original 500 miles limitation.

FORZDA3 · May 25, 2021

zdubyadubya said:

This statement ^^^^ is 100% false. BMW does this, but no USA OEM has every stooped to such tactics. Of course, BMWs attract real brainless douchebags, so likely justified.

Nbk4t5e · May 25, 2021

Papy_Yosh said:

It only lasted for about 100 miles then the throttle response and power was back to normal. They could have just reset the screen through the monitor which I should have tried myself. Hopefully there is not a next time.

Sent from my iPhone using Tapatalk

JohnE · May 25, 2021

FORZDA3 said:

Interesting. My wife loves her BMW but I’ve never considered her a brainless douchebag. Quite the contrary, really.

Nbk4t5e · May 25, 2021

JohnE said:

I’d take my buddy’s tuned M5 competition any day and I’ll wear a t-shirt saying “douchebag”

Sent from my iPhone using Tapatalk

Mobius87 · May 25, 2021

FORZDA3 said:

Not that I don't want to believe you, but do you have proof of any of these things? Or is it just something you know?

Nbk4t5e · May 25, 2021

[QUOTE=just a word to the wise ... be carefully and make sure you know what they are doing to your ride if you take it in for warranty work.

Rugrat2553 · May 26, 2021

FORZDA3 said:

Chevrolet does with the C8. Lower redline and limiting torque during the break-in window.

https://www.autoblog.com/amp/2020/01/11/c8-chevy-corvette-torque-limit-break-in-500-miles/

nzaf985 · May 26, 2021

Rugrat2553 said:

There are others in the US that do the same as well, FORDZA3 is just brainless... LOL

wesg79 · Apr 8, 2022

FORZDA3 said:

2020 and up Cadillacs do it... and corevette prevents people from being morons in test drives and someone from going to the track a day after they take the car home

Cdubya · Apr 8, 2022

Sometimes the shifting gets rough on my Explorer after a period of time. You can easily do a PCM module reset or just reset trans adaptations using Forscan Lite or Forscan. Just about all the modules are listed and can be reset if it's acting funky. No need to visit the dealer.

Sign Up! To view all forums and unlock additional cool features

ECU master reset!

Nbk4t5e

Active Member

zdubyadubya

Active Member

Nbk4t5e

Active Member

Papy_Yosh

New Member

FORZDA3

Member

Nbk4t5e

Active Member

JohnE

Active Member

Nbk4t5e

Active Member

Mobius87

Member

Nbk4t5e

Active Member

Rugrat2553

Member

nzaf985

Member

wesg79

Member

Cdubya

1000 Post Club

Explorer ST Posts