RPOD71

I'm crossing my fingers.. took my truck in for a ticking/tinging sound in the drivetrain and brought up the 'ole intermittent starting issue (again). This time I had it on video failing. Not sure if it helped, but the mechanic wanted to see the video. So long story short, it stayed there overnight and when I picked it up the next day, the diagnosis was a bad (out of spec negative battery cable under load) It was dropping over 280mv and should be less than 200. Also said my "driving habits" were not helping the battery charge because I only drive about 30 min to work. Battery was slightly undercharged, which they also corrected. I'm hopeful the negative cable was the culprit. Real head scratcher about my commute not enough to charge the battery though. It's 3/4 highway speeds. Side note, the ticking sound was the driveshaft

My ‘18 Sierra has been doing this for so long, I got used to it. Glad to see a fix for it. I did the washer trick, drivers side only.

Thanks, this will give me a good start. I found an 1100 page pdf on GM Upfitter that I browsed briefly. Seems to have everything electrical. Should be a good read when I start nights later this week. I have unlimited paper at my disposal, but I probably need a few toner cartridges to print it all out at work lol.

Back again, next winter season, same issue. Completely random no starts via fob. I don’t have app access unless they offer a free trial. I haven’t taken it to the dealer yet, but I will soon. I only use the remote start in winter and everything was going well, until it didn’t start before leaving for work (11/22/19). Since then, I started an excel spreadsheet with date, time, temperature, method (fob 1x/2x or key), failed ( Yes or No), and info columns. The 1x/2x for the fob is my way of keeping track if I only used I once or hit it again to get another 10 min of warming up. All entries are 1x. Thinking about it now, I should have kept track if it was running or not when I put the key in and left. I kept track of every start, even with the key. I was hoping to see a pattern or something that I can take to the dealer to help pinpoint the issue. On 12/19, it started fine with the fob. Made a stop at a gas station 15 min later and used the key (log entry 37) to start it. When it was cranking, it just stopped like I let go of the key. This isn’t the first time this has happened either. I noticed it a handful of times since I owned the truck, random times, random seasons. The next failure came at log entry 100 (weird lol) and it was via the fob. Same story, lights flash once. Since entry 100, I’ve only been keeping track of remote starts. Today, entry 120, 10 degrees, failed with fob, lights flash once. I was pissed off all the way home lol. I have zero faith with my dealer and when I take it in next, I will go to a different one, hoping a different set of eyes may solve the issue. I know there are wiring diagrams out there, but does anyone have a ladder diagram of the remote system? I’ll trouble shoot it myself (not the dealers way of trying it a few times and say “looks good to me”). A ladder diagram would be beneficial so I can see what permissives need to be met in order for the fob to work. Plus what volts or ohms the items require to tell the truck to start via the fob because all conditions are met. I know hood, doors, low oil, low fuel are some, (all?) until then, I’ll continue with my log. Since this has started to be an issue and the sometimes random key start hiccups, I’m leaning towards a bad ground. Somewhere.

My settings to enable or disable those features are in the infotainment system. The mirrors are in comfort and convince (I think) and I forget where the window is located, but they are both in there if equipped on your vehicle.

Happens with both

They claimed the load tested the battery and checked all components related to the remote start. I don't believe they did. The invoice just stated they hooked up the tech2 and tried to recreate the problem, found no codes, etc. I would think it would have the other stuff listed to keep from chasing their tails for the next time I brought it in. I'll check the battery myself, but if it happens again, I'm going to a different dealer. They claim my OnStar error codes are "probably" from a bad signal from the satellite. They can't even give me an exact reason for the codes.

So I took it in and again.. nothing. I left it overnight so it sits for 12+ hours, in the cold, like it does for me at home or at work. They said they can't fix something they can't replicate, started numerous times for them. No codes, no history (because no CEL). Frustrating. Going to pick it up and ask to see what was done other than starting it remotely. Would like to see my battery listed as something checked as well as whatever switches would keep it from starting.

I've read that elsewhere on here that it will store the info without cel. How do you tell the service advisors that you know it does when they and the mechanic tell you otherwise, and they are the "experts"?

No CEL, no code. The dealer plugged into OBD upon arrival and me explaining the problem. Said no code for anything. When I scheduled the appt, I asked if a failure to start remotely would leave a code, they said only if the CEL is on.

Yes it is.

It's the same. It's been a while (I don't even have the truck anymore) but I remember not putting the check mark in the box that makes sure it's compatible with my 1500 because the part number was for a 2500.

Back in July, I traded in my 14 Silverado for an 18 SLT premium plus. Been more than happy with the upgrade. Since it's cold, I've been using the remote start when needed. Noticed the issue a while back when I tried using the fob walking to my truck after work. Lights flashed and nothing. I dismissed it at that time. Worked via fob or app for a while and then it didn't again. So I took it to the dealer. They couldn't replicate it but did do an update that addressed the crank position sensor. A week or so of starts remotely worked, then it didn't again. Most recent failure was this morning. If it fails via the app it gives error 220_99. If I try again with the app it is 220_12. The 220_12 (I think) is the same you get if you remote started twice and tried a 3rd time without using the key. One recent failure via the fob (after the dealer), I was in my garage and I heard it. It sounded like you just bumped the ignition. This will be new info when I go back to the dealer, but I'm wondering if someone else had this issue?

Look under the truck by the spare tire. You'll see the wiring. One has a dummy plug cover. At least my 14 did. That's where the harness plugs in. Then use the provisions in the truck and snap the holders into it. It's pretty easy, but I do remember using string to fish the ends that come up the side if the bed.

Been trying various techniques to get my build sheet. First tried the PM to the GM rep here. Sent email exactly like Zoomie did last night at work. Got my 4 page PDF early this morning.