GM OBD1 code 12? It means your engine's RPM signal isn’t detected during cranking. Common causes include a faulty crankshaft position sensor, defective wiring, or a malfunctioning ignition module. Haynes Manuals helps you diagnose and fix the problem step by step. Find your GM manual today at haynes.com. #HaynesManuals #HaynesShowsYouHow #GMRepair | Haynes Manuals
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