2009 Ford S-Max 2.0 TDCI ABS Error U0401: Traction Loss & Power Issues - Solutions?

Question

Has anyone had such a mistake in the 2009 Ford S-Max 2.0 TDCI?

Error in the ABS
- U0401 Incorrect data obtained from engine/transmission control module
- Information about the event
- Discontinuous

I will add that the error sometimes appears while driving - the traction lights up and loses power until the engine is restarted.
I searched the forum a bit and couldn't find anything specific.

decybel91 · Answer

You need to connect to the motor controller. Fuel or boost pressure problem. After removing the error in the ABS will go out.

bucek21 · Answer

There is no error in the motor controller.
As for the traction control light, it goes off after restarting.
If it was a problem with the boost pressure, then there should be some error stored in the engine, and it's clean.

decybel91 · Answer

Plug in as soon as the light comes on.

Launch78 · Answer

Or maybe the Focus has FAP off and the error table in the ECU is turned off, I have a lot of such cases. Disconnect anything and see if it shows an engine driver error.

fructon · Answer

I had such a problem in a Ford Kuga, it helped to upload newer software to the ECU.

paradox17 · Answer

I have the same problem. How did you solve it?

bucek21 · Answer

It was a problem with the turbo, blocking geometry. If the traction comes on and the engine loses power, you need to connect the computer and check the error in the engine controller.
The error will only be visible when this problem occurs. After turning off the engine and turning it back on, the error will no longer be there and will remain only in ABS U0401.
This error will always appear because the engine is working incorrectly and enters the so-called. emergency mode and indicates that the data from the engine controller is incorrect. I struggled a bit with this too, starting with the whole bundle. After cleaning the geometry in an ultrasonic cleaner, the problem has not returned to this day.

piter1602 · Answer

For me, this is exactly what happens when I disconnect, for example, a flow meter, it does not show an error. So how do you turn the ECU error tables back on? Please answer @Launch78, because I see that you are in the topic.

MobilTruck · Answer

Ids and Controller Reprogramming function. For this you need the Calibration File, after such a procedure you have the ECU as it left the factory.

wri0rex · Answer

Hello
Ford Mondeo MK4 1.8TDCI. Once it threw errors P2263, the car entered emergency mode max 30 km / h, fuel consumption 50 liters, additionally the traction control light came on. I removed the errors, they did not return, but the U0401 error remained and returns after removal. I checked the flow meter, MAP sensor.

decybel91 · Answer

You've fixed the bug, but has the bug been fixed? P2263, turbo pear, sensor on it, vacuum and turbine vacuum valve.

wri0rex · Answer

There's no pear there. You have a driver and a stepper motor.

xPiterosx · Answer

>>20455287
And how did you find the culprit? because I have exactly the same only that the 2.0 TDCI engine. I will add that if I make a long route, this error does not pop up, but when I do short routes, it will throw these errors after some time. I think that the EGR valve is not clogged, because I heard that when the EGR is clogged, it can show various errors.

wri0rex · Answer

I cleaned the exhaust manifold, intake manifold, EGR and how I had it dismantled, I removed the turbine and cleaned the variable geometry. It's cool for now.

[Solved] 2009 Ford S-Max 2.0 TDCI ABS Error U0401: Traction Loss & Power Issues - Solutions?

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