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Error Codes P0231 and P0603
P0231 Fuel Pump Relay Driver Circuit Failure
P0603 Internal Control Module KAM Error
I borrowed a friends Edge Programmer and it gave me these codes. I had no reason to check for a code (no lights on dash) Trucks seems to be running fine. First powerstroke though so I'm not sure. 180K miles on it gets pretty bad gas mileage. 11-12 MPG it's 4x4 185 tires. Could these codes cause my gas mileage to be bad? Is there something I need to check into more? Or should I just clear the codes. Thanks in advance for all the help.
2002 PSD 285 tires - 4X4 Everything so far is stock. I just finished the DIY Intake Mod.