This is a well known issue and has been in a number of DCJ vehicles since at least the 1970s, don't ask me why. Generally speaking it's a harmless nusance in the sense that there is no immediate need to fix anything especially if a routine transmission service is in the relatively near future; I planned on living with it until 50,000 miles but got my SunCoast a bit early. In the interim after the vehicle has been sitting for in excess of 6 hrs (IMHO it takes at least that long for the drain back problem to occur) get in crank up; with foot on brake shift into neutral (as near as I can tell from the FSM the tranny pump pumps faster in neutral then park but I could be wrong and this worked for me) and hold rpms at ca. 1,000; while putting on seat belt and getting settled count off 10 seconds or so; put into drive or reverse and go about your business. If when you first put it into gear the tranny doesn't IMMEDIATELY engage shift back into neutral and repeat the idle in neutral cycle.
Alternatively you can just crank up and shift into drive or reverse and press the go pedal. If it doesn't IMMEDIATELY go then do the idle in neutral trick which works every time.
I stress immediately because if there is any hesitation and you try to drive you will probably get about 100-200 feet at which point there will be a somewhat violent engine stall, not good, that may produce a CEL. The CEL will go away after 4-5 good starts but I like to avoid that problem and the stall.
As noted the fix is a tranny service with ATF+4 and brand name new filters; no eBay bargin filters. Nothing special about the service, any decent tranny shop can do it but stress ATF+4. If you want to do it yourself there may be a writeup in Sir Sam's NOOB guide but if not see the FSM links there. A rather messy job as you have to drop the tranny pan and there is no drain so tranny fluid will get all over everything below the pan. When the job is done be sure to check that the plate on the side of the valve body is fully bolted in place and not cracked; another known issue that can be corrected by a Transgo kit.
_________________ Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs
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