I have been fighting an electrical gremlin for two years! The usual symptom is the instrument cluster goes dead for a few seconds. (That hasn't been resolved) Now it has decided to attack the starting circuit. So, if it has sat for a few days, when I turn the key, the starter engages and the engine starts. However, when I release the key, the starter stay engaged! When this happens, I shut if off and restart. Eventually, it will run without the starter hanging up. When it does, it runs very rough and will not move itself. The information screen shows " Reduced power mode" and the check engine light is on. The code reader displays P1682. I can clear the code and it starts and runs as it should. I did swap the start relay with the AC relay but no change. Any thoughts on where to start looking?
Some of the service history: It has to sit for a few days before the starter issue pops up. If I start it every morning, it doesn't seems to happen. The instrument cluster has been replaced. The ignition switch has been replaced twice!
Thanks,
Gary

 

Hi Gary,
I have absolutely same problem with my Express 2500. How you fixed it? Regards.

 

Serge,
I replaced both start and run relays and that seemed to resolve the issue. Hope that helps.

Gary

 

Thanks, Gary. Will try to do the same.

 

If you trace your problem to a bad relay you might want to review THIS post and consider filing a complaint with NHTSA (link in the post)
as this may be a defective part problem.
NHTSA can order a recall but there needs to be a number of complaints on file.