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GM OBD1 Trouble Codes Guide 2021 by ScribdTranslations is a document available to read on EtoBox.

What is GM OBD1 Trouble Codes Guide 2021 about?

This document provides a list of OBD1 codes and their descriptions for diagnosing problems in GM vehicles. It explains that to read the codes without tools, a bridge must be made between pins A and B to activate diagnostic mode and count the flashes of the check engine light, where each number of flashes corresponds to a specific diagnostic code. It then lists 99 common codes with a brief description of each sensor or circuit problem.

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