Your DTC's are not valid..A 55 can not occur if you have a 44 or 45, can't get a 54 using 5.7 L code. Code 51 says PCM is getting internal CRC errors (bad code or bad PCM) and 53 says your voltage to PCM exceeded 17 volts. I really think you have incorrect software/firmware in your scanner or it's not working correctly. I would reset PCM (pull fuse or battery) for a few mins. Reconnect fuse or battery, w/key on engine off scan it again w/o starting the engine. Look to see if any codes come up. If you get a 51 your PCM code or PCM is corrupted..That's catastrophic, all other codes are invalid if you have a DTC 51. By the way NONE of the other codes should set w/o the engine running, if they set w/o starting the engine and w/o a code 51 then your scanner is misleading you or your PCM (very rare coinsurance) is bad.
I'm Bob.. 1994 Z28, A4, Stall, CAI, Cam, RR's, 342 rear, LT's , CatBack, Tuned
Last edited by bobdec; 10-31-2012 at 05:29 PM.