Whats going on with my GX!?

[ten29fd]

Hi all, I was hoping you guys could help me with a question. I took my rig out to Phillips loop in calico today. Before going up a steep incline I placed my car in 4lo with my center diffs on lock. While starting to climb I thought I heard a pop and the car suddenly stopped going forward. I immediately step on the brakes once I heard the noise. While the transmission was in drive, I noticed the car would roll backwards as if it was in neutral. I rolled back down the hill in reverse and when I shifted to drive it would just rev. I turned off my car and turned it on again. I noticed there was a check engine light along with three other icons that were lit up. After restarting the car I was able to put it in drive and the Car would go forward properly like before. I was able to continue and finish up the trail with no issues and the car felt fine other than the lights on the dash being on. I almost felt like the car’s transmission popped into neutral even though it showed it was in drive. Any ideas on what happened? I recently got all driveline fluids and the transmission oil service as well. Once we finished off roading I took the center diffs off lock and put the car back into 4hi. Car feels normal other than the cel and 3 other lights. *UPDATE* I turned on my car this morning and the CEL lights as well as the others on the dash have gone away. Car feels normal while driving it around. I went ahead an bought a scan tool. When I plug it in, the codes (P0500, C1223 and C1241) show up even though I dont have a check engine or any other lights on my dash. Any input and help is appreciated.