“Shift to Neutral & Press Start” while driving

[tcafranz]

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. 

Edited March 9, 2025 by tcafranz

[Transient]

Did you try to shift it into Neutral and then press start like the truck told you to?  Your original post indicates otherwise. 

[tcafranz]

On 3/9/2025 at 11:18 PM, Transient said:

Did you try to shift it into Neutral and then press start like the truck told you to?  Your original post indicates otherwise. 

Yes. Typo sorry. Fixed