Ok I looked up the code and replaced the sensor on the head and sensor on the radiator. My temp gauge on the dash works and when i drain the coolant to see if the radiator sensor works I get the low coolant light telling me that that sensor works. But I still get code 118. I also looked at my engine temp via ATAP and saw that the computer is reading the engine temp as -38. Becuase of this I believe this is the reason my car is only getting 13 to 15 degrees of timming at wot. Ive also checked the fuses in the engine bay and found nothing wrong with them. I recently had custom tunning aby Ed Write but sent it back to get it reflashed back to stock because I changed my heads and cam combo and was gonna get Thunder to do LS1 edit for me. Thanks for any help in advance