I have had this problem on and off since owning the van, a 2014, 2.3 Multi Jet. It's driving me mad!
On acceleration or if the revs drop when I'm in a gear too high for the conditions, the van lurches and a warning comes up on the dashborad saying 'Hill Ascent Mode Not Available... See Handbook.' Sometimes it happens all day and then it drives perfectly normally for weeks on end. When the issue occurs I sometimes get a warning light and a message saying 'check engine.' If I stop, switch the engine off and wait a while the warning light goes out. At other times I have plumes of white smoke (particularly under load - accelerating or climbing hills). Once again, if I stop and turn the engine off, it clears itself. My local garage can find no fault codes on their diagnostic machine. Lately, and today for example, the van was driving perfectly normally (as long as I gently ease the accelerator on to nurse it up to speed and don't make sudden demands) then as I climbed a hill I lost all power. I even struggled to pass a cyclist. Again I get the warning, 'Check Engine.' Again I stop, switch off, wait and away I go again. The only thing now is... it's becoming more and more frequent.
All the mechanics I've spoken to are scratching their heads. I don't want to go down the road of refurbished injectors, turbo replacement, fuel pump replacement, this sensor, that sensor... I did that before with another van and it cost thousands. When the van is having a good day I cannot fault it, so I cannot see that replacing the above mentioned items will achieve very much apart from making the garage richer.
