Code 421326 after BM3 trans flash

Dtex535 · 11-17-2019, 10:50 AM

Had this code pop up after BM3 trans flash, 421326- transmission control(egs). Anyone else have this happen or know what it could be from?

Unspec · 11-18-2019, 09:23 AM

Try a full reflash. Are there any lights on in the dash?

Dtex535 · 11-18-2019, 09:43 AM

Quote:

Originally Posted by Unspec

Try a full reflash. Are there any lights on in the dash?

Yea I’ve tried that. Flashed it back to stock and then BM3 flashed. No lights on the dash.

Unspec · 11-18-2019, 11:24 AM

Quote:

Originally Posted by Dtex535

Yea I’ve tried that. Flashed it back to stock and then BM3 flashed. No lights on the dash.

You should reach out to the developers of BM3 then

Dtex535 · 11-18-2019, 12:00 PM

Quote:

Originally Posted by Unspec

You should reach out to the developers of BM3 then

Thank you, I just emailed them

BimmerHausPerformance · 11-18-2019, 01:19 PM

What year is your car? I know some of the older production dates have older software that doesn't always play nice with flashes... in other words, maybe they will recommend you update all your ECU's to the latest version for your car. That's what I'm doing prior to my MHD flash just in case... Either way, let us know what they said.

Dtex535 · 11-18-2019, 01:41 PM

Quote:

Originally Posted by BrowBMW

What year is your car? I know some of the older production dates have older software that doesn't always play nice with flashes... in other words, maybe they will recommend you update all your ECU's to the latest version for your car. That's what I'm doing prior to my MHD flash just in case... Either way, let us know what they said.

2015 535 ewg

BimmerHausPerformance · 11-18-2019, 02:41 PM

Well, that's fairly new, keep us posted please.

ThaiBruin · 11-18-2019, 05:28 PM

No issues with trans flash on my 2014 535 PWG.

s.floydjr · 02-02-2020, 08:01 AM

Quote:

Originally Posted by Dtex535

Had this code pop up after BM3 trans flash, 421326- transmission control(egs). Anyone else have this happen or know what it could be from?

I have this exact scenario with my 2016 428i. Did you ever resolve this issue? I reached out to BM3 and they weren't any help for me. Told me it had nothing to do with the tune, even though it wasn't there beforehand, and to take my car to the dealer.

Dtex535 · 02-02-2020, 10:58 AM

Quote:

Originally Posted by s.floydjr

I have this exact scenario with my 2016 428i. Did you ever resolve this issue? I reached out to BM3 and they weren't any help for me. Told me it had nothing to do with the tune, even though it wasn't there beforehand, and to take my car to the dealer.

Yea I talked to BM3. We did a remote screening sharing session. They were able to fix the problem. It was something on their end that was wrong.

11-17-2019, 10:50 AM	#1
Dtex535 Private First Class 101 Rep 192 Posts Drives: 535i Msport Join Date: May 2018 Location: Ct iTrader: (0)	Code 421326 after BM3 trans flash Had this code pop up after BM3 trans flash, 421326- transmission control(egs). Anyone else have this happen or know what it could be from?
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11-18-2019, 09:23 AM	#2
Unspec Colonel 1295 Rep 2,588 Posts Drives: 2015 BMW 535xi Join Date: Apr 2019 Location: DMV iTrader: (1)	Try a full reflash. Are there any lights on in the dash?
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11-18-2019, 01:19 PM	#6
BimmerHausPerformance Major 513 Rep 1,442 Posts Drives: 2011 535i 6MT Join Date: Apr 2019 Location: Chattanooga iTrader: (1) Garage List 2011 BMW 535i [0.00]	What year is your car? I know some of the older production dates have older software that doesn't always play nice with flashes... in other words, maybe they will recommend you update all your ECU's to the latest version for your car. That's what I'm doing prior to my MHD flash just in case... Either way, let us know what they said.
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11-18-2019, 02:41 PM	#8
BimmerHausPerformance Major 513 Rep 1,442 Posts Drives: 2011 535i 6MT Join Date: Apr 2019 Location: Chattanooga iTrader: (1) Garage List 2011 BMW 535i [0.00]	Well, that's fairly new, keep us posted please. __________________ 2011 F10 S55 6MT Website Insta @bimmerhausperformance YouTube
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11-18-2019, 05:28 PM	#9
ThaiBruin Captain 171 Rep 688 Posts Drives: F10 535i M-Sport Join Date: Oct 2013 Location: Playa Vista, CA iTrader: (0)	No issues with trans flash on my 2014 535 PWG. __________________ 2014 Carbon Black 535i M Sport - Bootmod3 / M Performance Exhaust / Carbon Graphite Vorsteiner V-FF 103 / KW V2 *Retired*- 2013 MG 328i Sport Line 6MT - BMS Stage 1 / M Performance exhaust / M Performance steering wheel / M Performance shift knob/boot
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