Boz
When I read post like these I cannot help thinking about all the numerous canbus issues these conversions often create.
I get one each and very month no less!
Either a bad install or one that has gone "sour" over the elapse of time.
In fact we just tore a pile of "spagaretti" wiring from the 2008 van which had ABS and transmission & vehicle communication issues
This stuff was at least Napa's twin #14 sheathed cable, too big for the application though , (causes current drops for starters.) in this case, but we have seen worse much worse!
The current owner had recently bought the van and it then started going on the "fritz".
I contacted the previous owner who sold it for some background, he considering it to be a van possessed.
This last one had created shorts in the ABS brake apply signal circuitry, corrosion had set into the scotch lock wire splicers (why do people use these things I dunno!
)
The trailer hitch wiring shorted out and for some reason a connection to the transmission control circuits
This was interfering with the hall effect speed sensors in the transmission internal circuit control. It took one of the speed sensor out so we had a limp mode condition.
So it was transmission control valve & circuit dropped. A new circuit board ($270) and about 4 hours of diagnostics plus 8 hours of wiring removal & remediation!
Job was around $1800 to put right.
In short excuse the pun, get it checked and if its the installer's fault!!!!!!
Get the install shop to put it right!
Dennis