This is interesting. I believe I read that ESP turns completely off when in 4LO or at least I thought it did with QDII. I have an 07 CRD with QDII and I think it just illuminates the 4wd light and nothing else but I'm not sure so I will see tomorrow morning what happens. I know this wasn't exactly what you're looking for but I thought it would be of some relevance. Maybe it actually does turn off but the 05-07's didn't illuminate the ESP light whereas the 08+'s did?