To ensure reliability, purchase GM part # 16048127 Calibration Unit (Prom). 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 Astro, Blazer, G20 models. It fits GMC C2500, K1500, Suburban.
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