To ensure reliability, purchase GM part # 12596679 Engine Control Module (W/ 2Nd Mpu W/O Boot)& Calibration. It is sometimes referred to as GM Engine Control Module. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Buick Rainier models. It fits Chevrolet Impala, SSR, Trailblazer. It also fits GMC Envoy. This also fits Pontiac GTO, Grand Prix.
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