Check the listing for details. Programmed 2001-2002 Silverado 2500 PCM 12201281 | Engine Computer ECM. Condition: Remanufactured. Listed at 140.00 USD. Is your Silverado 2500 running rough, shifting erratically, or showing a persistent check engine light?. The computer is the ‘brain,’ and when it malfunctions, it can send out confusing signals. A common issue with this specific2001-2002 Silverado 2500 PCM is internal driver failure, which might report a bad fuel injector or ignition coil when the component itself is fine.