sam hain

Found this thread, the reprogram might fix his.

My dad has a 2020 Trail boss, when he hooks up his boat the running lights do not work. He has brake lights, and turn signals though. We hooked up his boat to my truck and all the lights work. So we hooked up his truck to my FIL's camper, same issue all lights but running lights work. We checked fuses and all of them were fine. Friend of mine has a 2019 Sierra 1500 said you have to press some button on the left side of console near the lights knob to get his to work and thought that might work on my dad's trail boss but it didn't. Truck has 4k miles on it so he has an appmt with the dealer Friday morning. Thought I might could save him some time and get a fix on here. Thanks guys.

Buddy of mine has a matco scan tool, problem (oddly enough) is the Mass air flow sensor. His scan tool showed one code for it, plus he has a 2015 Silverado and we swapped out his mass air flow sensor and my idle returned to normal.

I've looked over the battery area no less than 10 times now and can't find anything obvious. At this point I may need another set of eyes to look it over because I'm not finding anything.

My FIL removed the battery for me since I'm working from home because of COVID, I put the new battery in. No sparks or anything like that. Just very strange how the problem seems to only be with the idle. Once driving you would never know anything was going on.

I found a test light, everywhere I put it I the light lit up. I started the truck after checking everything (cold start) and it started normal, idled up to about about 1200rmps for about 30sec then dropped down to about 400rpms and started missing. IDK know what's going on, the truck ran completely normal before the battery died.

My setup doesn't look exactly like the picture you posted. I don't have a check light I'll have to go get one, but all the connections were tight. I noticed I didn't have a wire on #3 I looked everywhere and didn't see a loose wire.

Thanks for the help Chris, I will check these and let you know.

Update: Found out you have to do a battery reset to the computer, having it done tomorrow will report back.

Last week I went to start my truck and it just clicked, checked voltage on the battery and was 10. Removed battery and replaced it with a brand new one. Ever since my truck has a very low idle and has mis-fire codes stored P0172 and P0175, CEL is not on though. Idle is around 3-400rpms and has a noticeable mis/skip in it. Transmission also shifts hard up/down. I've checked the battery with the truck running and it shows 15v being put to it at idle so I know the alternator is working. Once driving it seems to run fine, normal power etc. The problem seems to be at idle. I've removed the battery cables twice now and let the computer drain again, then hooked everything back up. Someone on the facebook group said to let it idle for 5mins and it should "learn" again and reset the idle. I've done that and it didn't help anything. I've got a shop nearby I thought about seeing if he could hook up his scan tool and see if it shows something my little cheap code reader doesn't. Just to note, the truck ran fine before the battery issue. It was the stock battery (4yrs old) so I assumed it died because of age.