I've read a couple recent threads on replacing battery in our trucks Have not seen any information on using a memory maintainer when unhooking and replacing the battery. Is there an approved model out there for doing this? I would really rather not lose the "learning" the PCM has done to allow the trans to shift properly not to mention other functions.

I have FORScan on my laptop and think I can reset the BMS when the time comes.

 

I just have a little 12 VDC power supply I use. I connect the positive lead to the positive battery cable somewhere and ground to the negative cable where it connects to the truck body.

I just use a smart charger I have when I do FORScan changes. Then I don't get the low voltage message and don't have to run the engine.

Don't know if there is something "approved".

 

I had a simple device that plugged into the lighter and used a 9v battery. Maybe I can find that and maybe that would work? This '18 is a lot more sophisticated than my '05 was so don't want to mess anything up.

 

Power to the DC power points (lighter) is controlled by the BCM and is on a timer. After the time-out period, I don't think the power point is connected to anything other than the open contact on the relay. So, I don't think it will work if you just plug it in there.

 

I don't think this truck has a "lighter" in it? How bout the 12v port on the dash? Or in the console? Or backseat at rear of console? Same story?

 

Sorry about that.

 

Just changed my battery and used a Jumpstarter / Air Inflator unit to keep a stable 12V in the truck's circuits. I attached the clamps to battery positive and ground screw on the truck, turned the jumpstarter on and did the battery swap. When I reconnected the battery cables on the new battery's posts, I turned off the jumpstarter and disconnected the clamps. The radio's clock was still set, the fuel trim and idle setting were unchanged and the fuel mileage bar chart was still present on the instrument cluster. Those are three issues I've observed in the past when a low voltage or a no voltage situation occurs.

 

Thanks for the replies everyone, I might look into getting a jump starter. From what I read, there are capacitors in the circuits that will keep memory alive for a couple minutes anyway when the battery is disconnected.

 

There is no need to do any of this for a quick battery change.

 

This is the case at least for my 2015. I changed the battery (took it out, went and returned with a new one, and put it in) in about an hour, all memory functions remained.