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What is a 238 code for chevy silverado

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I have replaced my map sensor and still have a PO 238 code on my 2002 chevy Silverado

Vehicle: 2002 Chevrolet silverado 5.6 durma max diesel

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P0238 Turbo charger boost sensor circuit

This code condition is for the boost sensor  . this is not for the MAP sensor but it acts like a MAP sensor especially when it fails.it stumbles as you acclerate Part # 1997255

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