Gen 3 is an electrical nightmare. Drive mode, exhaust mode, onboard power

[MikeGreen]

I currently disconnect the battery to reset ECM. It’s snowing like a like crazy and I don’t have 4 wheel drive. Current problems.

Exhaust rattle on startup. (Parts are on back order with no delivery date). Also exhaust modes are unavailable so I can’t change notes.

Drive modes unavailable

4x4 unavailable.

Pro power onboard unavailable.

 

[HighwaySentinel]

First thing I would do is check to make sure all of your fuses are seated. Might as well check the ones under the hood as well as inside the cab.

 

[BigTaco]

I would also hook the battery up to a tender/charger for good measure. Man, sorry your dealing with this.

 

[jm77]

Sounds like a short somewhere or voltage issue. Check to make sure all fuses are fully seated, battery cables tight and check voltage both with the engine on and off.

I had a Chevy that had a loose battery cable. It threw a bunch of system errors because of it.

 

[Johnny@Apollo-Optics]

I had a gen 2 but gotta say the gen 3 is say more electronically involved. A not calibrated shock sensor took away my 4wd and drive modes as well..