How to read GM trouble codes on OBD1 with a paper clip or wire.
How To Read GM Truck RPO Vehicle Option Codes
Reading GM RPO Glovebox Codes and Build Sheet
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Last Updated: October 15, 2026
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Summary
Auxiliary battery new ECM 2019 GMC Sierra This is a HD Um we here to program the ECM The The automotive scan tool are our eyes into the vehicle computer systems. It is literally impossible to diagnose today's vehicles ... Warning this is a long video. Showing what steps I've taken in an attempt to diagnose a P219B Fuel Imbalance fault All right class so uh today we're going to be talking about um g m Showing you how to get you're OBD1 into diagnostic mode to read stored Here is how to read the RPO vehicle option