[delaineyklein]

FBO 2014 BMW 435i Xdrive
I apologize in advance for the length, I wanted to make one post explaining everything, important info first.

I’ve been having issues with this for a year now. It started last July when I re-flashed my Bm3 tune and got Chassis Stabilization, Pedestrian Warning, and Front Collateral Warning permacodes in the check control. Nothing came up when checking the body codes, but it disabled some basic functions, ex. cruise control, sport/ eco mode, etc.

In October, the car started having issues with the FlexRay. The Chassis code was replaced with an Adaptive Headlight Malf., Headlamp Vert. Aim Malf., Passenger-restraint System Malf, and I lost power steering. It only happened 4-5 times randomly after starting, and was “fixed” by turning the ignition off and letting the iDrive restart. This entirely went away.

It’s December at this point and I still had the 3 original check control faults. It started to occasionally buck while on the throttle between 65-80 mph on the highway. It felt like someone was pressing the brake. Checked the codes, and there were a slew of Signal Invalids: ICM Interface, Wheel Torque, Angle Accelerator, Torque Crankshaft, Longitudinal Acceleration, etc. I chalked it up to wheel torque sensors 1 & 2, and switched them to see which was defective. The bucking went away for a bit but came back.

Last month (April), I was passing on the highway at 80 mph. The car bucked, promptly threw itself into neutral, and then bricked itself. It put itself in park at 3 mph and wouldn’t start back up. I noticed I don’t have the codes from this exact day but this is what I got in neutral:

Check Control: Brake System, Drivetrain Malfunction, Transmission Malfunction, Fuel System Malfunction, Pedestrian/ Collateral Malfunctions

48002C ICM, ACC: Interface DSC
CAAC0A Interface DME/DDE (data, drivetrain 2, 0x3F9): signal invalid

E06C43 Signal (warning object coordination status, 0x21F) invalid, transmitter DSC/ICM
E06C44 Signal (warning object coordination status, 0x21F) invalid, transmitter DSC/ICM

D01646 No Message (angle accelator pedal, 40.1.4), receiver ICM, transmitter DME/DDE
D019AB Signal (drive train data 2, 230.0.2) invalid, transmitter DME/DDE

D35A57 ICM Interface (longitudinal acceleration, centre of gravity, ID: 0X199) signal invalid
D35557 No Message (wheel torque powertrain 1, 0X08F), receiver DSC, transm. DME/DDE
D35558 No Message (wheel torque powertrain 2, 41.3.4), receiver DSC, transm. DME/DDE
D35A08 No Message (wheel torque powertrain 6, 61.3.4), receiver DSC, transm. DME/DDE
D3556D No Message (wheel torque powertrain 3, 0X145), receiver DSC, transm. DME/DDE
D35B3F No Message (wheel torque, drive 5, 40.3.4), receiver DSC, transm. DME/DDE
D35570 No Message (wheel torque powertrain 4, 0X0DC), receiver DSC, transm. DME/DDE
D358E1 No Message (torque, crankshaft 1, 0X0A5), receiver DSC, transm. DME/DDE
D35646 No Message (accelerator pedal angle, 0X0D9), receiver DSC, transm. DME/DDE
D35577 Signal (wheel torque powertrain 4, 0X0DC), invalid, transm. DME/DDE
D3557A Signal (wheel torque powertrain 4, 0X0DC), invalid, transm. DME/DDE

E12C3D DSC Interface (message from CBS partner BBV): Signal Invalid
E114BE Signal (transmission train display data, 0x3FD) invalid, EGS/DKG/EME
E699AB Signal (data, drivetrain 2, 0x3F9) invalid, transmitter DME/DDE


I’ve had enough at this point so it went straight to the dealer. I thoroughly explained everything to the tech and he still blamed it on the tuning software “causing an under-voltage in the vehicle”. They jumpstarted it to get the engine running, charged the battery, disconnected my Dinan boost chip, wiped my ECU, and updated the iDrive. The check control faults finally went away. They took it for a 15 mile test drive and “it was fixed”. Wrong! It threw itself into neutral again 8 miles down the road and the check control faults came back. Jumpstarted it, turned it back on, drove 6 miles and it went into neutral up a hill. It turned back on just fine after waiting 3 hrs for AAA.

Got it home and cleaned all 4 wheel speed sensors. It was fine driving 150 miles round-trip to pick up a brake pad sensor (detailed why at end). 300 miles later it bucked on the highway and the control faults came back, luckily they all went away after clearing the codes:

Check Control: Brake System, Collision Warning System Malf., Pedestrian Warning Reduced

E06C43 Warning object coord. signal invalid
48002C ICM, ACC: Interface DSC
48068C Transfer Box: Temporary fault, temperature
D35A57 ICM Interface (longitudinal acc., centre of gravity) signal invalid
D36D44 Signal (longitudinal torque distribution, front/rear axle, 19.3.4) invalid, transm. VTG
D01646 No message angle accelerator
D016E4 Message (distribution status, longitudinal movement, front/rear axle, 19.3.4) missing, receiver ICM, transm. VTG
D018E1 No message torque crankshaft 1
D01557 No message wheel torque 1
D02D58 Wheel torque 1 signal invalid
D01558 Wheel torque 2 no message
D0156D Wheel torque 3 no message, missing
D01570 Wheel torque 4 no message
D01B3F Wheel torque 5 no message
D01A08 Wheel torque 6 no message


250 miles after that, the car bucked on the highway, threw codes but no faults. It seemed like it was somehow getting better; no issues for 1000+ miles after that. Forward 3 weeks to last night, it was raining and I lost traction around a turn for the 3rd time. Threw itself into neutral and we’re back to square one. It did it again 3 miles down the road. I didn’t bother checking the codes the first time because I already knew what was going on, but saw this the second time accidentally clicking read instead of clear:

440040 Transfer Box (VTG): Terminal 30b: line disconnection


The car’s been sitting in the garage since. I know for a fact the issue starts with the wheel speed sensors; the wheels move a little too fast and the car goes into limp mode. I’m unsure where to start, I can’t find anything on the terminal or what could cause the disconnection. I only saw e9x posts. Any advice/ help would be greatly appreciated. I’m tired of throwing money at this thing and nothing fixing it.





Maintenance/Services:

July/ Aug. 2023

• Flashed to stock to fix the vacuum leak. Serpentine belt snapping, destroying both camshaft seals (initial cause)
• Contacted 3 mechanics, Kassel Performance, Dinan, and Bootmod, no definitive answer
• Ngk spark plugs, CTS turbo inlet pipe, valve cover gasket, tensioner/belt/pulley kit

Nov./ Dec. 2023

• Found faulty tracker on battery, caused severe drain
• Contacted BMW tech, said it was the tuning
• Took it to a tuning shop, had the ZGM reset and car diagnosed, said it was my broken side camera
• Duralast Platinum H8-AGM, VRSF 7” intercooler, new coolant/oil line seals, rotors/pads/sensors/fluid service

March 2024

• Replaced camera and got new connector wiring from a donor 535i. Faulty camera opened the circuit, causing the front sensors to not work
• Replaced both oil filter housing seals, didn’t tighten the last bolt enough and blew oil all over the alternator (idk if that’s relevant)
• Switched the front two wheel speed sensors

April/ May 2024

• Software update, ECU reset, removed Dinan performance chip
• Cleaned wheel speed sensors and the space they sit in, checked connections
• Wheel rotation
• Brake pad sensor snapped back in Jan., figured the open circuit messed with the wheel speed sensors, replaced it
• The battery’s in the correct range. I’ve been putting it on a 1 or 4 volt charger whenever it starts acting up because of the said under voltage
• Checked the fuse boxes, it looks like nothing’s blown