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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > F30 N55 Multiple Codes on Cold Start, Limp Mode
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      11-28-2020, 05:24 PM   #1
bimmerace
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F30 N55 Multiple Codes on Cold Start, Limp Mode

So I got the following codes all of a sudden in a morning startup. I would randomly get the first one but after warming up and restarting the engine, it would dissappear. Car is FBO upgrade turbos with catless dp, but the cat codes were disabled by my tuner.

120408 - Charging pressure control: Switch-off as consequential reaction.
123002 - Wastegate valve activation: Short circuit to ground
12B102 - Oxygen sensor heating before catalytic converter, activation: Short circuit to ground.
12B302 - Oxygen sensor heating after catalytic converter, activation: Short circuit to ground.
1B5202 - Supply, terminal 15N_1: Short circuit to ground.
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      11-29-2020, 11:29 AM   #2
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      11-30-2020, 01:22 PM   #3
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Car year, miles, more specific mod list?

Have you checked all the wires over by the O2s and WG? You have 4 short circuit to ground codes and they appear to all be over in that area. Did you install the DP yourself?
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      12-01-2020, 10:31 PM   #4
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Quote:
Originally Posted by thejeremyman9 View Post
Car year, miles, more specific mod list?

Have you checked all the wires over by the O2s and WG? You have 4 short circuit to ground codes and they appear to all be over in that area. Did you install the DP yourself?
131k miles, SpeedTech stage 3 efr 8374 turbo kit, FBO. I had the shittiest shop install it, and another shop reinstall it. I'll check the wiring in that area, all the codes showed up at the same time on a freezing cold morning, could that have anything to do?
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      12-01-2020, 10:55 PM   #5
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Quote:
Originally Posted by bimmerace View Post
131k miles, SpeedTech stage 3 efr 8374 turbo kit, FBO. I had the shittiest shop install it, and another shop reinstall it. I'll check the wiring in that area, all the codes showed up at the same time on a freezing cold morning, could that have anything to do?
That install story immediately makes me suspect wiring even more lol.

The freezing cold could have been a coincidence... hard to say. If you subsequently warmed the car up and restarted and the same codes came back after clearing i would say the temperature was not a direct cause.
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      12-02-2020, 09:15 PM   #6
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Quote:
Originally Posted by thejeremyman9 View Post
That install story immediately makes me suspect wiring even more lol.

The freezing cold could have been a coincidence... hard to say. If you subsequently warmed the car up and restarted and the same codes came back after clearing i would say the temperature was not a direct cause.
Yeah going to that shop was one of the worst mistakes of my life as not only did they do a shitty job, but they also overcharged me (5k), and stole my downpipe and sold it.

But the second shop as been pretty good and will have them look into it, it's most likely some wires as you mentioned as the turbo fitment is pretty tight.

Anyways, I ordered the dorch stage 2 hpfp this black friday, so hopefully it'll arrive before I take it to the shop so they can install it at the same time 🤤
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      12-02-2020, 09:19 PM   #7
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Have you talked to Jeff at Speedtech? He's incredibly helpful. Might put you in the right direction.
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Mods: Speedtech Stage 3 EFR 7670 Turbo Kit, Remus Catback Exhaust, Wagner EVO 3 FMIC, Dorch Stage 2 HPFP, Walbro 525 LPFP, EOS BPM4 EKP, Fuel-It Fuel Lines, Bend Calibration Flex Fuel Kit

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