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I have a 2003 Silverado 1500 5.3 L. I recently installed a rebuilt 4L60E transmission in the truck. Before the replacement my truck started just fine, just had burnt clutches. Once everything was put back together I go to start the truck and it doesn’t want to crank. All light come on except gear selector on dash. I go to hook up a ODB reader and it will power on but when I try to run diagnosis it says no communication. I checked all fuses and relays. Tried to jump starter snd crank relays to see if it would start and never started. It did try and crank though. Checked voltage to starter and I’m getting 12 volts. Just put a new battery in as well. I replacer gear shifter solenoid and neutral safety switch thinking that might be the problem. Checked all connections on harness and tried checking all grounds. When I got this trans the safety neutral switch had the one plug for the harness. My harness has two plugs for it. Idk if that could be a problem and it’s not reading what gear it’s in or what. I feel like I’ve tried everything I know that I can do. Any guidance would be appreciated. This is the second transmission I’ve installed in my truck. First one had no problems after install. Could it be a security feature that’s stopping me from starting the truck maybe? One other thing I noticed it my key fob isn’t unlocking snd locking my truck anymore. Might be irrelevant but thought I’d throw it in.

Today I installed an OEM takeoff bumper that I had purchased on Ebay. After getting the lights and sensors re-connected after mounting the bumper, when I go into reverse I get the message on the screen "Rear Parking Assist Symbols Unavailable". Connector seems fine and tight and all sensors look connected as far as I can tell. Does this require some sort of re-programming by the dealer by chance or am I missing something?

Greetings the frozen tundra of South Dakota. I mention the weather up front as I see others have experienced the issue I'm currently having. Posting up my issue to add to community knowledge. The truck: 2015 Sierra, 6.2, 8-speed, 4x4. Bought it used back in August, sitting on 125k. This is my first winter with the truck. Ambient air temps have been single digit or below zero for a week or so. Anticipating this, I set out to put a battery tender on the truck and plug in the block heater. The other day I hit the remote start to warm it up before going to town to run errands, got ready and went out to find it not running. Got in, used the key and one click, no crank. After several hours charging the battery, it started right up. Next day same thing. Next day got stranded a few miles from home. No low battery warning, all the gauges read normal, no check engine light. Tried to jump it and eventually it started right back up. Since then, only the one click. I do have tools and diag equipment and whatnot and there are a lot of checks I have not done yet. It's -25 outside and there is a couple inches of snow on the ground. I have done a couple of quick tests in the limited amount of time I've been outside messing with it. In an effort to get it started again so I could get it inside the barn and at least out of the snow (and close to the tools and a portable heater) I pulled the starter relay and shorted power to engage the starter. It only clicks once. That points me in the direction of the starter / starter circuit being the issue. Things I need to do: Get the multimeter out and check for voltage everywhere it should be. Get to the starter through the passenger front wheel well so I can check the ground under the A pillar and the heat shield protecting the starter motor. There is a TSB about voltage arcing to the heat shield so I need to check that. Thaw the starter motor. Maybe I can tape a shop vac hose to a heat gun and shove it in there to see if it is just jammed with ice. I don't want to buy a starter if my starter is just frozen. I don't want to go through the effort to pulling the starter to thaw it. Where ever this path takes me, I have to solve it. Can't have a truck that turns into a paper weight 6 weeks a year. I know most people won't ever experience this issue but that doesn't mean the root cause isn't present in your truck too. So I'm going to figure it out and keep a record of my findings here. Thanks.