Hi from Vancouver, Canada!

I stopped to get groceries today and when I tried to start the truck it started then died. It continued to do so multiple times. It did this a few weeks ago and I swapped some relays around under the hood thinking it may be a sticking relay and it fired up. Now it's happened again. only error codes are P0688 and p0533.

Can anyone help me with this? It's stuck at the grocery store as I type this. Luckily it's a block away. I just want to fix it there rather than pay for a block tow.

I know my way around a wrench I just hope it's not the computer taking a crap!

Thank you guys!

 

Thanks everyone but I figured it out on my own...

 

What ended up being the problem??

 

X2- can't post stuff like this with out saying what the problem was and what the resolution was