P0540..Then system shut down
This one is quite odd and not sure if anyone has come across this.
Back in the summer, we were at Lake Havasu and it was about 110 outside. While filling up the boat, the truck was idling with the A/C on, family inside. We left the gas station and started up a hill. Power decreased and got a P0540. Looked it up and related to the intake heater voltage. I thought it was odd that it came up, it was hot outside, engine in the 190 range. Ok, checked the connections, cleared the code it was fine. But for a while, even at full temp and in the 100's outside, I'd see the voltage fluctuate while driving like the grid was going on on off. Then suddenly stopped.
Fast forward to yesterday, about 65 outside, I start the truck after work. Engine temp still about 100. Voltage going up and down, I noticed veins were hunting a little bit, and my p3 brake controller (with no trailer) would randomly flash "No Trailer". I was driving about 40 mph. Then suddenly nothing for a brief second. No radio, no gauges, like a complete reset. Didn't have to do a restart it came back up, it reset the engine oil life monitor, no codes stored and the voltage flattened out.
Anybody have any thoughts?