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Old 21-02-2013   #1
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error code P0236

I keep getting the engine light with this code(P0236) when i am doing between 2.5-3000 revs for more than about 5 secs .This then limits the engine to 3000 revs .After stopping the engine and restarting the fault clears itself after a variable period of time .I've done a search on this forum and it suggests that the overboost valve is faulty does this sound about right given the symptoms i describe
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Old 21-02-2013   #2
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Re: error code P0236

MAP sensor in all probability, try taking it out, cleaning the gunk out of it and see if the fault clears before you order one.
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Old 21-02-2013   #3
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Re: error code P0236

Quote Originally Posted by momoe View Post
MAP sensor in all probability, try taking it out, cleaning the gunk out of it and see if the fault clears before you order one.
To be honest that is exactly what i have just done ,the sensor was full of black oily gunk there wasn't even a hole at the end so will run that and see how it goes

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Old 22-02-2013   #4
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Re: error code P0236

A mentioned yesterday i have cleaned the MAP sensor and noticed a big difference in power output and MPG .On my trip to work i usually get 31mpg ,stop start A roads .Today i got 43mg ,so a big diffference there .I took it up the motorway for a spell and the engine light still came on as i was climbing a long hill and approaching 3000revs so i am thinking that i need to pull the overboost valve off at the weekend and clean that and make sure it is working properly ,unless anyone has any other thoughts
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Old 22-02-2013   #5
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Re: error code P0236

I had a something very similar on my car (04 JTD 115) a few years ago. A diagnostic check at a garage pointed to it being the MAP sensor, which they replaced. I think the fault code may even have been the same as yours.

However, took it out for a quick thrash and the engine light came straight back on at 3000rpm under load.

It turned out to be a short length of rubber hose (about 2" long) that the other end of the vacuum tube from the MAP sensor pushes into. It had perished a little and there was a small split about 1/4" long in it at one end. This was enough for me to loose vacuum to the sensor, flagging the engine control fault. The fix cost me 50p!

It might be worth having a look at the same bit on yours.
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Old 22-02-2013   #6
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Re: error code P0236

Quote Originally Posted by widemouthfrog View Post
I had a something very similar on my car (04 JTD 115) a few years ago. A diagnostic check at a garage pointed to it being the MAP sensor, which they replaced. I think the fault code may even have been the same as yours.

However, took it out for a quick thrash and the engine light came straight back on at 3000rpm under load.

It turned out to be a short length of rubber hose (about 2" long) that the other end of the vacuum tube from the MAP sensor pushes into. It had perished a little and there was a small split about 1/4" long in it at one end. This was enough for me to loose vacuum to the sensor, flagging the engine control fault. The fix cost me 50p!

It might be worth having a look at the same bit on yours.
Cheers for that ,what i plan at the weekend is to get the front up on some ramps and check all the tubo pipe work and remove the overboost and clean it because it does look very rusty
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Old 22-02-2013   #7
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Re: error code P0236

Have you seen this thread?:

https://www.fiatforum.com/stilo/2342...code-info.html

It's for the Stilo, but the engines are very similar. Some of the comments about the solenoid valve are interesting.
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Old 22-02-2013   #8
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Re: error code P0236

Quote Originally Posted by widemouthfrog View Post
I had a something very similar on my car (04 JTD 115) a few years ago. A diagnostic check at a garage pointed to it being the MAP sensor, which they replaced. I think the fault code may even have been the same as yours.

However, took it out for a quick thrash and the engine light came straight back on at 3000rpm under load.

It turned out to be a short length of rubber hose (about 2" long) that the other end of the vacuum tube from the MAP sensor pushes into. It had perished a little and there was a small split about 1/4" long in it at one end. This was enough for me to loose vacuum to the sensor, flagging the engine control fault. The fix cost me 50p!

It might be worth having a look at the same bit on yours.
Hang on, what am I talking about? the MAP sensor only has an electrical connection to it. Need to go and have a look under the bonnet......

......it's the short piece of rubber pipe that connects the smaller (hard, black) tube to the bottom of the solenoid. Mine now looks as though it's got a hell of a kink in it, which can't be doing it much good. Another job to put on the list!
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Last edited by widemouthfrog; 22-02-2013 at 14:01.
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Old 22-02-2013   #9
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Re: error code P0236

Quote Originally Posted by widemouthfrog View Post
Have you seen this thread?:

https://www.fiatforum.com/stilo/2342...code-info.html

It's for the Stilo, but the engines are very similar. Some of the comments about the solenoid valve are interesting.
Yep , i did a search yesterday and that one came up ,it seems the valve is in the same vulnerable place on the multis so might move it while on at the weekend


Could that code relate to injector issues ?
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Old 22-02-2013   #10
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Re: error code P0236

Quote Originally Posted by widemouthfrog View Post
Hang on, what am I talking about? the MAP sensor only has an electrical connection to it. Need to go and have a look under the bonnet......

are you thinking of the overboost valve rubber pipe which goes into something else(can't think what that is), fixed between just below battery/air filter and the side of the engine block
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Old 22-02-2013   #11
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Re: error code P0236

See edit above.
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Old 02-03-2013   #12
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Re: error code P0236

Got around to looking at the overboost valve today and it looks like the actuator was stuck ,i pushed it down with a screw driver to free it and dropped some oil around it checked the rubber hose and that's ok but when i try to activate it with ecuscan it doesn't move ,so i suppose that means it's knackered ??
What is it that the valve is connected to via the rubber hose ,could it be that that's knackered and any way to test it ?
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Old 04-09-2013   #13
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Re: error code P0236

Quote Originally Posted by martyh View Post
Got around to looking at the overboost valve today and it looks like the actuator was stuck ,i pushed it down with a screw driver to free it and dropped some oil around it checked the rubber hose and that's ok but when i try to activate it with ecuscan it doesn't move ,so i suppose that means it's knackered ??
What is it that the valve is connected to via the rubber hose ,could it be that that's knackered and any way to test it ?
Hey did u get this sorted? Was it the boost valve at fault then?
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