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Old 03-04-2018   #1
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Turbo / electrical fault

Hello


I've tried searching for some info relating to this fault but can't find any.


My wife has a 2015 500x multiair 1.4 turbo. She has owned the car for approx. 18 months now.


The car has an issue where it will suddenly lose power, it is as if the turbo has stopped working. The car needs the nuts revved of it to go anywhere, and on a motorway will not go past 60mph. When the car is put into the 'sport' mode (i.e. the turbo is displayed on the dash) it does not show the turbo working... Fuel consumption appears to be rapidly increased when this issue happens.


If the car is then driven say the next day, it suddenly works ok, and will pull great as if nothing happened!


The problem first happened last summer, and now happens approx. once a week (she uses the car daily for approx. 60 miles commute). We took the car to 2 different fiat garages who were none the wiser about what the fault could be, unfortunately the car is now no longer in warranty


One thing I have noticed when this fault happens, cruise control does not function (in anyway what so ever, pressing the buttons on the wheel do nothing what so ever) and the brightness of the radio/sat nav screen appears to be a lot darker than usual. Because of this I believe the fault to be electrical related (surely if the turbo is finished, it would completely stop working and not randomly work again...?)


Has anyone heard of a similar issue like this before, or have any pointers as to what could be causing it?


Would really appreciate anyone's thoughts and advice on this, thank you!!!


Steve
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Old 03-04-2018   #2
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Re: Turbo / electrical fault

Hi, if I were you, I'd pose this question on the Alfa Romeo Giulietta owners forum.
There have been a small number of issues with Multiair units in the past and those guys have possibly come across this before.
You'll find that they're pretty knowledgeable and (on the whole) helpful.
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Old 03-04-2018   #3
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Re: Turbo / electrical fault

Sounds more like a failure with the multiair valves not opening properly causing lack of power. Doesn’t sound like a turbo fault to me.
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Old 04-04-2018   #4
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Re: Turbo / electrical fault

Thanks for your replies.


I will have a look on the Alfa forum to see if there is any more info about the fault.


I agree that it probably isn't a turbo fault, surely if the turbo has a problem it would stop working completely and not randomly start working again. My only concern is that when the fault occurs there are other issues at the same time (cruise control not working, and the dimming of the radio / sat nav screen).


Any more advice info would be greatly appreciated.


Thanks again chaps
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Old 04-04-2018   #5
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Re: Turbo / electrical fault

Quote Originally Posted by steviea712 View Post
dimming of the radio / sat nav screen
In my car that happens randomly, never figured out any pattern or logic. Could be a coincidence.
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Old 04-04-2018   #6
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Re: Turbo / electrical fault

This is worth checking.

If you pop the top cover off the engine (two M13 bolts and a single rubber rear centre pull up to remove mount) you will see that there is at least one small diameter silver metal pipe with orange tube connections. They come from the turbo (or that area) and go to the left (off side) of the engine.

On my vehicle the just flaps around in the wind as it is not supported/restrained in any way.

From new I noticed this and decided it was not ideal so decided to restrain/support/reduce the pipe flapping on the tubes.

It is probably worth checking that none of the orange joining hoses are loose or fractured.
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Old 04-04-2018   #7
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Re: Turbo / electrical fault

Quote Originally Posted by steviea712 View Post
Thanks for your replies.


I will have a look on the Alfa forum to see if there is any more info about the fault.


I agree that it probably isn't a turbo fault, surely if the turbo has a problem it would stop working completely and not randomly start working again. My only concern is that when the fault occurs there are other issues at the same time (cruise control not working, and the dimming of the radio / sat nav screen).

Any more advice info would be greatly appreciated.

Thanks again chaps
Silly point probably, but have you checked that both battery terminals are secure?
Had a 500 where one was a little loose.
Caused all sorts of probs (eg power steering chucking it) until I tightened it.
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Old 07-05-2019   #8
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Re: Turbo / electrical fault

Sorry to post in this after such a long time but thought I'd update on what happened incase anyone else has a similar issue in the future


There is some sort of actuation valve for the air intake of the turbo - eventually this was found to have a fault and was replaced


And because the car had the issue for than a year before it was finally diagnosed correctly, the garage believed the turbo was damaged, so this was also replaced


Now have a couple of other faults with the car... external temp is telling me its 39 Celsius when its more like 7 outside, and the sat nav can't pick up any satellites… car's warranty ran out last year


So fed up with this POS.....


Thanks to all those who replied before, really appreciate your help
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Last edited by steviea712; 07-05-2019 at 12:12.
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Old 07-05-2019   #9
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Re: Turbo / electrical fault

The outside temperature is a common fault with early 500X vehicles. Sadly this requires a new wing mirror base assembly to fix. Not cheap at around £170.

I hand mine replaced under warranty and if it fails again I will repair by replacing the non replaceable sensor. The sensor will almost certainly be a simple thermistor that has been moulded into the base assembly.
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Old 07-05-2019   #10
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Re: Turbo / electrical fault

Glad you got it sorted, shame the two Fiat garages couldn't figure it out, they are good cars when running right,
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Old 4 Weeks Ago   #11
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Hello everyone,

Sorry to revive an old thread with my first post!

My wife also has a 2015 500X 1.4 turbo. The car is showing almost exactly the same symptoms as this. It has been doing it for a while every 3 or 4 starts, then it goes away. Yesterday it put on the engine light and a “check engine” message.

I have plugged in my (very cheap Amazon special) fault code reader and there is on code, P0236 (Turbocharger boost sensor A performance).

Does anyone know what part Steviea712 had changed as I’m not too car literate so can’t work it out!

Thanks

Sam

Quote Originally Posted by steviea712 View Post
Sorry to post in this after such a long time but thought I'd update on what happened incase anyone else has a similar issue in the future


There is some sort of actuation valve for the air intake of the turbo - eventually this was found to have a fault and was replaced


And because the car had the issue for than a year before it was finally diagnosed correctly, the garage believed the turbo was damaged, so this was also replaced


Now have a couple of other faults with the car... external temp is telling me its 39 Celsius when its more like 7 outside, and the sat nav can't pick up any satellites… car's warranty ran out last year


So fed up with this POS.....


Thanks to all those who replied before, really appreciate your help
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