Join Date: Feb 2010
Drives: 2004 Optima 2.4 EX, 2005 Yamaha R1 (street) 2001 GSXR 1000 (track)
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Welcome to the forum. The two codes you have are:
P0763-Shift Solenoid C circuit malfunction
P0604-TCM RAM error
Check out the website listed in my signature line for a full description on both codes, as well as diagnostic steps. P0604 looks like a bad trans control module (internal fault). The P0763 could be wiring, the shift solenoid, of faulty TCM. I'm willing to bet the P0763 is related to the TCM. Usually anytime a control module sets a code for an internal fault, it's toast. I would start here (perhaps a used unit from a salvage yard vehicle or an online source.
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