Unable to reset Limp mode

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ChrisHall
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Joined: 12 Jul 2020, 09:28

Unable to reset Limp mode

Post by ChrisHall »

My current car is a Citroen C5 X7 1.6 HDi estate, 2010, 80000 miles

last week whilst driving I had a sudden lost of power and the car went into limp mode, a small hole was found in the turbo intercooler pipe which had been caused by the dip stick rubbing against it. Pipe has been fixed and the following codes reset
P1162
P0489
P0409
P0104
P0113

but the car is till in limp mode with no lights or codes showing

The car was last serviced about 4000 miles ago and also had a new EGR valve and MAS fitted

Any ideas ????

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GiveMeABreak
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Re: Unable to reset Limp mode

Post by GiveMeABreak »

How long after the pipe was replaced have you still been getting limp mode? I assume you replaced it and haven't tried to bodge it? The engine ECU can take some time to adjust the parameters of the air and fuelling system to account for the problem after being fixed (if it has actually been fixed and is still not present).

A proper 'limp mode' situation will only be enforced directly by the engine ECU if it detects problems - and will almost always result in a fault code logged. Are you using a Lexia kit with Diagbox to diagnose it or a generic scanner? Generic scanners generally don't have the capability to read all the fault codes - especially the constructor-specific fault codes.

ChrisHall
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Joined: 12 Jul 2020, 09:28

Re: Unable to reset Limp mode

Post by ChrisHall »

Hi Marc,
It happened on friday afternoon, drove about 10 miles home in limp mode and pipe replaced same day. A friend has a generic scanner that we used to reset the fault codes. The car remained in limp mode, started it again this morning and it is still in limp mode

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GiveMeABreak
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Re: Unable to reset Limp mode

Post by GiveMeABreak »

So it is possible that not all the codes are being picked up.

You could try a BSI reset using this guide (BSI Reset / Battery Disconnect / Reconnect Procedure) to shut all the ECUs down and restart it properly - (timings are essential and so is not opening any doors or playing wiuth any switches during the procedure or some of the vehicle networks will not shut down). If the car is obviously still in limp mode, then you have a fault not detected by the generic code reader. It will ideally need to be read by somebody with a Lexia kit and Diagbox.

But I would certainly make sure that you re-trace your steps and make sure that all and any the connections that may of been unplugged are plugged in and secure.

ChrisHall
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Re: Unable to reset Limp mode

Post by ChrisHall »

I will try the BSI reset you suggested. no connections were unplugged when swapping the pipe

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myglaren
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Re: Unable to reset Limp mode

Post by myglaren »

You may have to drive the car a bit to reset it. Usually four or five starts with a short drive following each start - a couple of miles should be sufficient.

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GiveMeABreak
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Re: Unable to reset Limp mode

Post by GiveMeABreak »

Absolutely Steve, which is why I was wondering about the time from replacing the pipe to the issues - as if it is still quite recent, the auto adaptives may have had insufficient time to compensate.

ChrisHall
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Re: Unable to reset Limp mode

Post by ChrisHall »

done the BSI reset and been on a test drive with several stop starts and no change