To ensure reliability, purchase GM part # 12635043 Engine Control Module (W/ 2Nd Mpu)E37 Service, No, Start. 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 Chevrolet Express, Silverado models. It fits GMC Savana, Sierra.
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