Check the listing for details. 12633238 E38 LS GEN 4 CHEVY GMC CADILLAC PCM ECM ECU ENGINE CONTROL COMPUTER. Condition: Used. Listed at 104.99 USD. BENCH TESTED PERFECT COMMUNICATION ECM/PCM For your LS/GM Gen 4 V8 Swap! This is a used, bench tested PCM with proven communication ready for your tune! Will work with all 4.8, 5.3, 6.0, 6.2 and 7.0 engines. Clean cases with minimal corrosion. Some minor marks typical of used parts. These cannot be programmed using factory GM equipment as GM no longer supports using used computers. You will receive one computer with GM service number 12633238 or 12633055. Please make sure this is the computer you need before ordering. THIS WILL REQUIRE A TUNE! NOT PLUG AND PLAY ! WE DO NOT DO ANY PROGRAMMING, FLASHING OR TUNING TO THESE !!!! These are STOCK AS A ROCK - Just pulled from vehicles, Tested and sold to you. NO CORE CHARGE! !!!!FREE PRIORITY DOMESTIC SHIPPING!!!! Faster shipping available! This part carries a 60-DAY WARRANTY! If within this 60 day period, the part fails, feel free to return it for a refund or replacement. International customers: We ship to most countries. Shipping costs are automatically figured during the checkout process. FEEL FREE TO CONTACT Pro-Rebuild Monday through Friday 9-5 CST