Need help. Car wont start. Mhd flash gone wrong.

Hbiliouris335i · 05-24-2017, 06:45 PM

Hey i really need some help. I put on a battery charger and pluged in mhd stock map. It then said preparrimg ecu and the wipers came on. I ripped out the cable and unplugged the battery charger. I tryed to start it amd it cranked and wont start. I pluged it in and tryed and it said no connection. Please help. My car is a 2009 bmw 335i x drive. Ran fine before.

ZeeVaughn · 05-24-2017, 11:53 PM

This is somewhat common if not done properly and something I did 4 days ago. I think I may have accidently inserted my keys but forgot to turn on the car, maybe I wasn't really sure but I had the same exact symptoms with the wipers.

I simply turned off the car, took my keys out, unplugged the obd cable and started all over. Had to flash back to stock map and then do a full rewrite on my custom tune and she started right up and everything was fine.

46m3csl · 05-25-2017, 01:08 AM

You ll be fine just replug the obd cable, and start from the begining , it may need a full flash which is 25 mins or soo depending on your car. It may start from where it left off

racermp · 05-25-2017, 05:55 AM

Quote:

Originally Posted by 46m3csl

You ll be fine just replug the obd cable, and start from the begining , it may need a full flash which is 25 mins or soo depending on your car. It may start from where it left off

What he said

Antetokounmpo · 05-25-2017, 06:49 AM

Full flash again.

Why the heck would you unplug it???????????? What did you think was going to happen??

NoGuru · 05-25-2017, 07:43 AM

Quote:

Originally Posted by Harambe

Full flash again.

Why the heck would you unplug it???????????? What did you think was going to happen??

I was thinking the same thing. Who cares if the wipers turn on, let it run it's coarse.

BeastMode335i · 05-25-2017, 08:18 AM

LoL, he ran off on the plug.. Literally..

lordbmw · 05-25-2017, 09:28 AM

Quote:

Originally Posted by Hbiliouris335i

Hey i really need some help. I put on a battery charger and pluged in mhd stock map. It then said preparrimg ecu and the wipers came on. I ripped out the cable and unplugged the battery charger. I tryed to start it amd it cranked and wont start. I pluged it in and tryed and it said no connection. Please help. My car is a 2009 bmw 335i x drive. Ran fine before.

Sometimes my wipers come on too when I flash with MHD. Must be a bug.

Whenever it does that, the flash will fail and frequently the ECU will go into recovery mode.

When it does that, I unplug everything, turn off everything, relaunch MHD and start again.

It's always worked the 2nd time so far for me at least. It will usually give an option the 2nd time to continue with the failed flash so MHD knows if you attempted a flash and failed.

roadkillrob · 05-25-2017, 11:04 AM

I have had my wipers come on also with MHD and I have had it happen flashing the trans with xhp - I think it is related to low battery voltage, but maybe not if it just works when you try again. In my case, both times I put my 70 amp charger on and it worked fine second try.

NoSlow5oh · 05-25-2017, 12:13 PM

I've only had the wipers come on once, and it was during a failed flash. I had to unplug the battery and wait a few minutes. I was then able to flash to stock and drive home, then I reflashed back to the tune. I did not need to do a full flash.

My issue was I didn't put the key in and turn the car to "ON/ACC" correctly as I've done flashes before without the keys since I have comfort access. Dumb on my part and I will always insert the key and make sure the car is "ON/ACC" before starting a flash again.

Gucho15 · 02-12-2019, 12:57 AM

hey i need help getting my car running again, the first time I tried to install MHD, my battery tender wasn't keeping up with how much energy was being used and now the battery is dead, the flash finished but everything is wrong with my car, windshield wipers are on, abs is malfunctioning, throttle is malfunctioning, etc the car revs up to 2,000 rpm over and over. I've tried reflashing with a better battery tender but the car is in the same state and the battery is still dead.

robthewrench · 02-12-2019, 09:38 AM

If the battery is truly shorted and won't hold 12 volts, you need to replace the battery. Charge the battery. Then test the battery voltage with the car off. If less than 12.6 volts, replace the battery.

Fritzer · 02-12-2019, 12:47 PM

Quote:

Originally Posted by Hbiliouris335i

It then said preparrimg ecu and the wipers came on. I ripped out the cable and unplugged the battery charger.

HAHAHA, why would you do that? Wipers going to fry your ECU?

Man, just do a full re-flash you interrupted the data transfer for no reason so the ECU has no idea how to run.

05-24-2017, 06:45 PM	#1
Hbiliouris335i Private First Class 16 Rep 116 Posts Drives: 2009 Bmw 335i Xdrive 6MT Join Date: Feb 2017 Location: Medway, Ma iTrader: (0)	Need help. Car wont start. Mhd flash gone wrong. Hey i really need some help. I put on a battery charger and pluged in mhd stock map. It then said preparrimg ecu and the wipers came on. I ripped out the cable and unplugged the battery charger. I tryed to start it amd it cranked and wont start. I pluged it in and tryed and it said no connection. Please help. My car is a 2009 bmw 335i x drive. Ran fine before.
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05-24-2017, 11:53 PM	#2
ZeeVaughn Second Lieutenant 85 Rep 207 Posts Drives: E92 335i 6MT SG/Coral Join Date: Jul 2016 Location: Norcal iTrader: (0)	This is somewhat common if not done properly and something I did 4 days ago. I think I may have accidently inserted my keys but forgot to turn on the car, maybe I wasn't really sure but I had the same exact symptoms with the wipers. I simply turned off the car, took my keys out, unplugged the obd cable and started all over. Had to flash back to stock map and then do a full rewrite on my custom tune and she started right up and everything was fine. __________________ Remember the buster
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05-25-2017, 01:08 AM	#3
46m3csl Captain 121 Rep 774 Posts Drives: 335i Join Date: May 2010 Location: Rowland Heights iTrader: (0)	You ll be fine just replug the obd cable, and start from the begining , it may need a full flash which is 25 mins or soo depending on your car. It may start from where it left off
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05-25-2017, 06:49 AM	#5
Antetokounmpo Brigadier General 1552 Rep 3,475 Posts Drives: E90 6MT FBO; '18 F150 Platinum Join Date: Jul 2013 Location: WI iTrader: (3) Garage List 2018 Ford F-150 Pla ... [0.00] 2008 BMW 335xi [0.00]	Full flash again. Why the heck would you unplug it???????????? What did you think was going to happen?? __________________ 2008 335xi 6MT \| VRSF Catless DP \| VRSF 7" FMIC \| VRSF CP \| TIAL BOV \| DCI \| MHD 2+ BC Racing BR \| Stoptech 600 \| Firehawk Indy 500 255 Square \| Atric Altimax 225 Sq. 2018 F-150 Platinum 701A \| FX4 \| 3.5 EcoBeast
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05-25-2017, 08:18 AM	#7
BeastMode335i Maximus Decimus Meridius 1130 Rep 4,584 Posts Drives: F30 335i Join Date: Apr 2014 Location: Down South iTrader: (2)	LoL, he ran off on the plug.. Literally.. __________________ F30 335i Melbourne Red Metallic M-Sport Package Last edited by BeastMode335i; 05-26-2017 at 06:30 AM..
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05-25-2017, 11:04 AM	#9
roadkillrob Major General 866 Rep 5,450 Posts Drives: 08 335i,22 X3M, 2012 C63 Black Join Date: Jul 2007 Location: Boston iTrader: (15)	I have had my wipers come on also with MHD and I have had it happen flashing the trans with xhp - I think it is related to low battery voltage, but maybe not if it just works when you try again. In my case, both times I put my 70 amp charger on and it worked fine second try. __________________ 2022 X3M Brooklyn Grey 2008 E93 335i FBO 2012 Mercedes C63 Black Series Alanite Grey
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05-25-2017, 12:13 PM	#10
NoSlow5oh First Lieutenant 56 Rep 318 Posts Drives: 08 e90 335i Join Date: Jul 2015 Location: Madison, AL iTrader: (2)	I've only had the wipers come on once, and it was during a failed flash. I had to unplug the battery and wait a few minutes. I was then able to flash to stock and drive home, then I reflashed back to the tune. I did not need to do a full flash. My issue was I didn't put the key in and turn the car to "ON/ACC" correctly as I've done flashes before without the keys since I have comfort access. Dumb on my part and I will always insert the key and make sure the car is "ON/ACC" before starting a flash again.
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02-12-2019, 12:57 AM	#11
Gucho15 Registered 0 Rep 4 Posts Drives: 2010 e90 335i Join Date: Feb 2019 Location: bay area, california iTrader: (0)	MHD gone worng hey i need help getting my car running again, the first time I tried to install MHD, my battery tender wasn't keeping up with how much energy was being used and now the battery is dead, the flash finished but everything is wrong with my car, windshield wipers are on, abs is malfunctioning, throttle is malfunctioning, etc the car revs up to 2,000 rpm over and over. I've tried reflashing with a better battery tender but the car is in the same state and the battery is still dead.
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02-12-2019, 09:38 AM	#12
robthewrench Captain 266 Rep 952 Posts Drives: 11 E90 335i Join Date: Aug 2014 Location: Columbus OH iTrader: (0)	If the battery is truly shorted and won't hold 12 volts, you need to replace the battery. Charge the battery. Then test the battery voltage with the car off. If less than 12.6 volts, replace the battery. __________________ bone stock
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