How To Fix P0621 Code - Generator Lamp Control Circuit Malfunction Repair
Автор: Car Cure
Загружено: 2026-01-19
Просмотров: 5
Описание:
In this video, I walk you through the steps to diagnose that annoying battery light on your dashboard associated with the P0621 diagnostic trouble code. We look at what the Generator Lamp L Control Circuit Malfunction actually means for your vehicle, whether you drive a Chevy, GM, or Pontiac. I explain why your PCM triggers this code when it sees a problem with the alternator warning light circuit. You will learn how to use a digital multimeter to check your battery voltage properly, seeing the difference between engine off and engine running voltage. We also cover inspecting the alternator connector, checking specific fuses, and verifying the warning bulb itself. If your alternator is not charging or you are worried about a dead battery, this guide shows you exactly how to fix P0621 code by testing the wiring continuity and ruling out the easy stuff before you buy expensive parts or replace the computer.
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