2015Chevyexpress15

No Crank, No comm. PRNDL does not illuminate and I cannot communicate with any module. I found a blow bcm fuse, and broken engine to chassis ground strap. replaced the fuse and replaced the ground strap, No changes

Any ideas?

mountainmanjoe

if the engine strap was broken, then the battery wasn't charging.
Try boosting it from another vehicle, and then getting your battery + alternator load tested.

2015Chevyexpress15

Tried boosting, charging, the Van will not start.

no communication with any module, and the prndl does not display on the dash.

mountainmanjoe

did you go through and check ALL the fuses? under the hood and in the cabin?

if the ground strap was broken, all that starter current might have back-fed into various other systems and fried things out. Use a meter to see if you have a reliable low-resistance ground on all the modules. You'll need schematics and pinouts which you can get from sites like gmupfitter.com and charm.li

JimMessner

I have a similar issue on my 2010 Van too. Starter wont turn over or even click.
We were going to leave on holidays with it tomorrow!
I replaced battery and no change.
The PRNDL does not light up and the signal lights do not work?
Everything was working well when parked about 3 weeks ago. (Battery always dies after being parked that long).
It's a Roadtrek Camper Van but I don't think that has anything to do with this issue?
I'm going to check the fuses under the hood tomorrow morning before I call a Tow Truck.
Its parked in a storage yard and I can't do much else unless someone has some good advice.
Thanks in advance!

mountainmanjoe

it could also be a bad ignition switch

Triaged

Shouldn't kill the battery after 3 weeks. Might want to start with that parasitic draw first. Any rats living under the hood?

JimMessner

Its been -25 to -40 degress the last few weeks here. Just starting to warm up to above freezing. We dont have any rats or mice this time of year but perhaps a rabbit?