Won't go out of park(gear shift) n no headlights

[Dennisday]

Four winds Thor motorcoach.HELP

[gmc]

Some more info please...

Park:
Assume slides in, jacks up..
Key in ignition? engine running? foot on brake?
No other interlocks that I know of that should prevent shifting from park (even all of above likely not interlocked...)
Any issues when driven last?
Since MI - any ice buildup underneath for some reason that could interfere with mechanical shift?
Then we get to the transmission...

Headlights:
Do any of parking lights, fog lights (if applicable), low beams, high beams work?
Headlights themselves typically on their own fuse and relay... those would be starting points if no low/high beams. Unlikely both bulbs and low/high would all go out.

What year is your rig?

[Dennisday]

2015 class c no slides. Just had it reset in mi. Front lites all flashing

[Dennisday]

Sitting in Kentucky but it has snowed here the last few days

[Dennisday]

GMC,door locks won't work,no tail lights,no headlights.for a short time it came back on.drove it then parked n it all went out again

[gmc]

Originally Posted by Dennisday

GMC,door locks won't work,no tail lights,no headlights.for a short time it came back on.drove it then parked n it all went out again

OK.. description changing a lot from 'Won't go out of park(gear shift) n no headlights'.

Sounds like everything at issue so far is on the chassis side - so focus there... I assume it won't start now based on other things not working? (Or at least won't start if the headlights/taillights/etc aren't working at the time...)

Hard to diagnose from distance - but my initial thought would be battery... A battery that won't accept/hold a charge could behave like that (had a U-Haul truck 2 months ago do exactly that halfway through 1000 mile trip... till they replaced the battery.)
May read 12+ volts with no load - but any load will drag it down. Even managed to get it started to drive a bit further - until I shut it off again.

Does Emergency Start switch help? (a very dead battery may not be...)
Sounds like you were camping when it failed?
How long ago did you drive it (aside from what you just mentioned)?
Plugged into shore power?

[StanN.]

Mine just did the same thing this morning. Mine is a Ford Chassis, it started just fine. It went about my business then when I got in the drivers seat again I noticed the gauges going crazy. They worked, then they didn’t, no vehicle lights including emergency flashers, parking brake will not release. I’m thinking battery or the computer. I turned off the coach and restarted it several times but no changes. Thoughts from someone more mechanically inclined than me please.

[HarryS]

Sounds like a voltage issue.

[StanN.]

Originally Posted by HarryS

Sounds like a voltage issue.

That’ll be the first thing I check in the morning. Thanks!

[StanN.]

I charged the battery and it was down to 60%. The 100% battery made no difference. Today without any kind of activity or warning the emergency flashers and rear view camera came on. It started, gauges all normal and it came out of park. Darn I hate gremlins!!!! You can’t fix what isn’t broke and when it’s broke you can’t go get it fixed. 🥴🥴

[StanN.]

The local Ford dealer found a GEM that wasn’t communicating with a few of its fellow GEM’s. It took two days to diagnose and repair but that was nothing compared to some of the horror stories I’ve read about this same issue. I’m a happy camper again.