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I lost all power going about 45 mph Last night after I let off the gas to make a slight right curve and when I pressed the gas again. My gauges reset and there was a message on the cluster screen that said “SHIFT TO NEUTRAL AND PRESS START AGAIN” (it may or may not have said “AGAIN”). I pulled over and while still in Drive with the brake pressed, I pushed Start/Stop and the entire vehicle reset. The ignition clicked nonstop for awhile but the engine did not turn over. While waiting for AAA, I disconnected my Pulsar LT and tried to start it, but got the same nonstop clicking. I scanned it and got a code reading: “P16A7: Engine Controls Ignition Relay Feedback Circuit 2”. ANY and ALL feedback is welcomed. 2019 (late/new model) GMC Sierra SLT 5.3L Crew Cab Short Bed ~115k mi if that matters.

Anyone else experiencing a hard shift or hesitation of the engine when you first hit the gas. For example, I start the truck, reverse out of the driveway, put the car in drive and when I hit the gas, the truck goes toward and then i feel the truck completely stop for a second (hesitation) and then it continues forward, I only expierence this when I’m going from reverse to forward. I come to a complete stop and do not shift to drive when moving backwards still. ?

My 09 silverado 5.3 4x4 has shifted hard into 2nd and some into 3rd for several years now. A few months ago I decided to fix it. Codes were for transmission control solenoids, module, oil pressure sensor, misfires...etc. codes like P0700 P0717 P0521 P0523. I replaced all 3 shift solenoids, oil pressure sensor, and immediately the truck shifted like new again and it lasted for a few days or a week. And it started shifting hard again. Really hard. It's so frustrating. And it's throwing all the same codes again. Recently, my truck started misfiring so badly the entire truck was shaking. It was running on two cylinders. All of the ignition colis were failing all at once and the truck was not drivable. Btw, I just changed out those ignition coils, plugs and wires just two years ago, all Ac Delco plugs/wires and duralast ignition coils. So anyways, I replaced all of the coils plugs and wires again this week and the engine no longer misfires, running on all cylinders again. And for a few hours after, there was zero hard shifting now. It was running great, like new again. Shifting smooth as could be. But after making it into the city and hitting traffic lights and stop signs, it didn't take long for the very hard shifts to come back. I've read on this and have been dealing with this in time and parts for so long now. I've read about ground wires could be the cause of all of this. I have replaced everything the computer has suggested, and for a short time after the repairs, the truck would run like new. But the hard shift always comes back. I know there's people out there that have had this same problem. I've read a lot about it but without actually finding the grounds for these specific sensors, I've hit a dead end. The issue just keeps coming back as it's obvious there is a root cause I am not getting to. Please share any knowledge or experiences on this topic. And any knowledge of the location of these grounds may be at. Thank you!

I just purchased a 2019 Silverado RST with the 5.3L, 3.42 Axle, Max Trailering Pkg etc to pull my travel trailer. After we picked truck up we went to dinner when we left the restaurant it would not shift out park. I shut it off and restarted a couple of times then just left it run and after a couple of minutes it would finally shift. I could hear the switch engage and the brake lights would come on but I was unable to pull the lever at all to shift from park. It happened three times this weekend so I took it to the dealer on Monday. They looked it over but didn't find anything wrong and said there were no bulletins on this issue. Anyone else have this experience?