I started getting a P0237 Code and the dealer replaced the sensor and still got the code. Traced all the wiring and said it was good and finally decided that the ECM was bad and the sensor was not getting the reference voltage. So they ordered and replaced the ECM and got all sorts of codes. They called tech and they said that they have been having problems with the wiring harnesses after being unplugged and plugged back in a few times. Now they are going to replace the engine harness. Has anyone ever heard of this?! I haven't gotten over to talk to them as I was out of town but, do the ECM's come plug and play? Or do they need to be flashed? Don't know if they put the old ECM in to see if it only got the one code or not. Or even if it was the correct ECM. Can't see an engine harness wearing out after unplugging a few times! I have been without my truck since Wed so I am going through withdrawls. :rant: OFF.