× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Re: GM charging system, codes P1637 P1638
Posted to Technical Discussion Forum on 2/24/2017

According to this note below from my supplier you my have the wrong regulator [...] application also shows 2 different alternators for this vehicle with 2 different regulators. You might call and see what the VIN number calls for (alternator)on this vehicle or... Login to read more.