Originally Posted by sumterjim
Looking for feedback on the need to disconnect the negative battery cable if a battery charge line is connected. The local GM dealer stated that the requirement to disconnect the negative cable he thought was because they have had experience with the transmission on four wheel drives going from neutral back to 4 wheel drive if the battery was connected. I have installed a drive shaft disconnect so I can tow a 2 wheel drive. the question I can't find a n answer for, does the battery need to be disconnected because of the electric power steering assist.
First off, I don't know WHO you talked with at a dealer but, if it was anyone but a tech, the percentage of getting a correct answer/reason etc. for your inquiry is seriously DOWN. "He thought", which I assume means, HE DIDN'T KNOW the real reason. This subject of disconnecting the negative battery cable in the newer GM trucks, even in the full sized intended for towing, has been discussed just a few times on here and other RV forums.
As of yet, as many of the posts concerning this very subject that I've read, I've seen no, ZERO, authentic or, verbatim, or per-GM tech manual, reason(s) for disconnecting the cable. The most used reason (that most guess at) is the electronic power steering. I don't have one or, I'd have found out what the reason is. Our toad, an '11 GMC Sierra 4x4 Extended Cab, needs nothing to be disconnected when towing it.
As for towing a two wheel drive 2015 Canyon, REMCO or, Family Motor Coach or, Motor Home Towing Guide, DID NOT MAKE THE TRUCK, GM did. So, If I were you, I'd go straight to the "horses mouth" so to speak, to find out all the pertinent information regarding towing it. I'm also going to assume that, if it's a 2015 or newer one you'll be towing, that there will be some form of warranty with this too.
If you go by GMs info and specs for alterations etc. for towing, (since your not intending on purchasing an authorized to flat tow- 4WD model) and you have a problem, at least you'll have GM to fall back on due to the fact that, you consulted THEM for answers. If you have a problem and any damage is done and you consulted REMCO for towing, good luck on having GM cover any damages under warranty.
Remco may be in business to assist owners of non-flat towable toads and, I guess that's good for those that don't or, won't purchase an authorized flat towable toad. I simply prefer to purchase one that needs no modifications, no changes, nothing, right from the git-go, to flat tow it. It's a preference thing. Good luck on your Canyon.