Unable to Enter Diagnostic Mode after Coding

A_Wesker · 05-30-2023, 12:00 AM

Hi, I have a 2020 M340i which I installed a new headlight module to change colors. The installation caused many malfunctions, so I had the car remote coded to fix the lights and remove the errors as they were affecting how the car drove.

Long story short, I had the errors removed and the car behaves good now but the only problem is after coding, I cannot go into Diagnostic Mode. The car is stuck on BM3 stage 2 OTS, and I cannot flash any other map as it requires the car to be in diagnostic mode. Bimmercode doesn't work and does not put the car in Diagnostic mode automatically as it does. The coder cannot seem to find out what happened either can anyone help? Have been dealing with this issue for a month now.

TheNine90 · 05-30-2023, 02:47 AM

You can force it to diagnostic mode using ISTA. Then try. Have you tried restoring the coding and see if it helps?

05-30-2023, 12:00 AM	#1
A_Wesker New Member 2 Rep 9 Posts Drives: BMW M340i, 330i(G20), 435i Join Date: Dec 2022 Location: New York iTrader: (0)	Unable to Enter Diagnostic Mode after Coding Hi, I have a 2020 M340i which I installed a new headlight module to change colors. The installation caused many malfunctions, so I had the car remote coded to fix the lights and remove the errors as they were affecting how the car drove. Long story short, I had the errors removed and the car behaves good now but the only problem is after coding, I cannot go into Diagnostic Mode. The car is stuck on BM3 stage 2 OTS, and I cannot flash any other map as it requires the car to be in diagnostic mode. Bimmercode doesn't work and does not put the car in Diagnostic mode automatically as it does. The coder cannot seem to find out what happened either can anyone help? Have been dealing with this issue for a month now.
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05-30-2023, 02:47 AM	#2
TheNine90 Banned 582 Rep 2,047 Posts Drives: bmw Join Date: Aug 2021 Location: Workshop iTrader: (0)	You can force it to diagnostic mode using ISTA. Then try. Have you tried restoring the coding and see if it helps?
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