help with code 43 and 51


New Member
Aug 13, 2014
Help! Anyone have these 2 codes at the same time? I have an all stock 87 (exept maf and hypertech chip) ive swapped ecm's ive checked esc module and all grounds and wiring checks out,Cant figure it out! yes ive re-seated the chip.
Either you have two bad chips, or a bad PROM socket, or defective ECM.

Remember, if the chip comes out of its carrier, putting it back in wrong would be a 50-50 shot. If it goes in backwards, immediate destruction occurs.
So I found out what was causing those 2 codes,maf translator needed to be set at- base 0 and wot 0, totally was not what the instructions said.Either way just glad its solved