Everett Lee Posted March 7, 2017 Report Share Posted March 7, 2017 Recently purchased 07 xc90 upon arriving home realized the awd wasn't working (steel gravel driveway. We removed haldex coupling filter and cleaned it was extremely clogged now we have a new one just haven't put it in waiting to see what codes it threw took it to a mechanic hooked it up says he reset these codes a couple times and the awd works for a minute then quits working p188914 p188974 not sure where to go from here .... Link to comment Share on other sites More sharing options...
Ihatespeedbumps Posted March 7, 2017 Report Share Posted March 7, 2017 Did the codes store before or after the haldex filter removal? Link to comment Share on other sites More sharing options...
Midnight Caller Posted March 9, 2017 Report Share Posted March 9, 2017 Maybe this will help ? https://www.___.com/forums/viewtopic.php?t=43133 Your pump may be going or is already defective. It's a common issue when the Haldex oil and filter are left unchanged for a long time. Your pressure sensor may also be faulty. In general, there are only three problems with the Haldex, either the sensor reports a wrong pressure, the pump goes bad or water infiltrates the DEM and bye-bye, but in that case you wouldn't be able to see it in the CAN network. Link to comment Share on other sites More sharing options...
Everett Lee Posted March 13, 2017 Author Report Share Posted March 13, 2017 I was figuring the pressure sensor and /or pump ...not sure about when code was stored took it to a mechanic didn't charge me but hasn't let me know what to do next he says he reset it a couple of times and it was working for a moment ....also there are two different tires well the same tires put on different times I know this is a no no and will correct asap so I suppose I may try and get a pressure sensor first and change it myself hopefully go from there.....any input is very appreciated :) thanks everyone Link to comment Share on other sites More sharing options...
hootie6828 Posted March 13, 2017 Report Share Posted March 13, 2017 Different size tires have no effect on the newer Haldex systems, it was only an issue on the older style viscous couplers. Link to comment Share on other sites More sharing options...
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