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06-24-2023, 09:12 AM | #1 |
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120408 DTC
So I’m dealing with a 102408 code that clears when I turn car off and comes back whenever it wants apparently. Throws car into limp mode and no other code present. Before this I was getting a 12B505 code for O2 sensor which I replaced both for good measure and reset adaptations cleared all codes and all was good…. For a bit. Now I just keep getting this solo code and it’s driving me nuts.
Anyone every dealt with this code or pointers on wtf is going on lol. Car is a 2016 BMW 750i with the N63R aka tu2 engine. Thanks for any input in advance Happy boosting |
06-25-2023, 07:16 AM | #3 |
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Fault Code Description
The diagnosis monitors the switching off of the charging pressure control by the DME. Fault monitoring conditions: Fault handling is performed by a different fault memory entry of the charging pressure control. Fault Code Conditions General Conditions Temperature precondition: - See individual fault. Time precondition: - See individual fault. Other preconditions: - See individual fault. Control unit voltage: 9 V to 16 V. Terminal Condition - Terminal 15 on Terminal Condition - PWF status: Driving Driving Conditions Note: The designations of terminal status or PWF status apply according to the vehicle electrical system of the vehicle. Fault Time Condition The fault is entered immediately. Service Plan - The fault entry is for information purposes only. - Measure for rectification: Work through all the individual faults that have an effect on the charging pressure system and the charging pressure control. Fault Impact - The engine operates in its emergency program. - Power reduction. - Trip can be continued. Warnings Warning Lights CC message Control Center Messages Service Notes Deactivation of the charging pressure control to protect the engine. The error is caused by another error for the charging pressure control or by an error for another component. |
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06-25-2023, 10:06 PM | #4 | |
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06-26-2023, 09:30 AM | #5 |
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Without seeing FASTA or live data, it's hard to say, but I would lean towards wastegate solenoids.
This kind of fault usually manifests itself when everything in engine compartment becomes heat soaked and those actuators start behaving funny. Everything within controller feedback loop might seem within spec for electronics, but actual boost deviates from the setpoint and is thus disabled/degraded. EDIT: From another thread I see that you run some kind of tune on your engine. This might very well cause your issues. |
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04-11-2024, 02:32 PM | #6 |
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Hey did you ever get this figured out? I am in the same boat as you with a 2016 750i, only has 35k miles on it right now. I will randomly get the 120408 code (do not get any other codes with it) and my car sometimes goes into limp mode. Will usually reset once I turn off the car.
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05-30-2024, 07:51 AM | #7 |
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120408 Help!
I have the same issue now. I was running JB4 for over a year and just got the code 120408 and drivetrain malfunction. I removed the JB4 and after waiting 24 hours, it reset but then after 20 mins of driving, it throws the code again. @[Raimo5]advised that the heat soak can cause actuator to act a fool. Does anyone know how I can diagnose to ensure it is the wastegate actuator?
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