lilindy500 Posted April 17, 2008 Report Share Posted April 17, 2008 I bought my truck 2 weeks ago. The PCM has white marker on it and it says APS 4470 in someones writing. Anyone know if that is someone's tune? Or was it maybe from a salvage yard and that is a lot number or something. Quote Link to comment Share on other sites More sharing options...
brobradh77 Posted April 17, 2008 Report Share Posted April 17, 2008 I dont know of any tuners who "sign" the PCM...probably a part # as you mentioned. Quote Link to comment Share on other sites More sharing options...
lilindy500 Posted April 17, 2008 Author Report Share Posted April 17, 2008 Ya, my thought is it was probably a PCM from a salvage yard or something, its messy writing, I don't think it would be something GM would have put on there. Anyway, now is the time to get a new tune since I don't know whats in there currently! yay! Quote Link to comment Share on other sites More sharing options...
misterp Posted April 17, 2008 Report Share Posted April 17, 2008 I dont know of any tuners who "sign" the PCM...probably a part # as you mentioned. Not only did my PCM have a PCM4Less sticker on it, but it looked like a notepad; my last name was on it no less than three times. Mr. P. Quote Link to comment Share on other sites More sharing options...
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