Limp home mode when towing Caravan

Shell69 · Mar 21st, 2012, 16:02

Hi there, first post.

After searching this website and a few others i wonderd if someone could help us with the above ??

Our 03 XC90 with 86k on the clock goes into limp home mode when we are towing our Caravan but it hasn't done it when we aren't towing. Generally when we pull off or on long ascents.

We've had the Fuel filter changed, the EGR valve cleaned (Wasn't really dirty) and the Turbo pipes checked for softening. All ok. The codes the garage are getting are as follows,

4405 EGR control flow to low.
6805 Boost pressure faulty/low.

Any further help will be much appreciated, as we are of to Scotland in 2 weeks and the car is still in the garage.

Michelle.

outnumbered · Mar 21st, 2012, 16:59

http://www.volvoforums.org.uk/showthread.php?t=132443

gazza12345 · Mar 23rd, 2012, 00:19

Look at the engine mounts & you will see a vacuum pipe going to them. There is an insert thats pushed into them & the vac pipe pushes onto them. One of mine were cracked. See picture. DSCF5960.JPG This vac pipe is linked to a load of other pipes. One of them controls the turbo boost. If there is a small leak in one of these pipes it makes the vacuum in these pipes to low for it to control the turbo boost. & it will go into limp home mode. The first symptoms of a problem i had weeks before it started going into limp home mode was that when i come of the accelerator it would still keep accelerating for a split second that was very unnerving when coming to a junction. I now put this down to the turbo still boosting because there was a lack of vacuum to stop it from doing this. It looks like the ecu was happy with it doing this because every thing was with in tolerances but as the leak got worse it started playing up.

Mar 21st, 2012, 16:02	#1
Shell69 New Member Last Online: Aug 6th, 2014 15:00 Join Date: Mar 2012 Location: Leicestershire	Limp home mode when towing Caravan Hi there, first post. After searching this website and a few others i wonderd if someone could help us with the above ?? Our 03 XC90 with 86k on the clock goes into limp home mode when we are towing our Caravan but it hasn't done it when we aren't towing. Generally when we pull off or on long ascents. We've had the Fuel filter changed, the EGR valve cleaned (Wasn't really dirty) and the Turbo pipes checked for softening. All ok. The codes the garage are getting are as follows, 4405 EGR control flow to low. 6805 Boost pressure faulty/low. Any further help will be much appreciated, as we are of to Scotland in 2 weeks and the car is still in the garage. Michelle.

Mar 21st, 2012, 16:59	#2
outnumbered Lunatic from Wakefield Last Online: Apr 16th, 2023 06:33 Join Date: Dec 2004 Location: wakefield	http://www.volvoforums.org.uk/showthread.php?t=132443 __________________ 2012 volvo xc90 Executive Buccaneer Bermuda 2021

Mar 23rd, 2012, 00:19	#3
gazza12345 Junior Member Last Online: Jul 1st, 2013 22:41 Join Date: Feb 2009 Location: sheffield	Look at the engine mounts & you will see a vacuum pipe going to them. There is an insert thats pushed into them & the vac pipe pushes onto them. One of mine were cracked. See picture. DSCF5960.JPG This vac pipe is linked to a load of other pipes. One of them controls the turbo boost. If there is a small leak in one of these pipes it makes the vacuum in these pipes to low for it to control the turbo boost. & it will go into limp home mode. The first symptoms of a problem i had weeks before it started going into limp home mode was that when i come of the accelerator it would still keep accelerating for a split second that was very unnerving when coming to a junction. I now put this down to the turbo still boosting because there was a lack of vacuum to stop it from doing this. It looks like the ecu was happy with it doing this because every thing was with in tolerances but as the leak got worse it started playing up.

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