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The Charging Circuit is "regulated" by the PCM (powertrain control module)If you are sure the Battery & Alternator is good (typically the Battery can cause the same problem), then the PCM will need to be tested, via Scan Tool to see if there is a issue or program problem.apprx 1 hour labor
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what is the typical cost for scan or replacement
Scan & Test apprx 1 hour labor + $ 85.00 - 135.00 depending on Shop (Deraler would be best bet)
ECM (Part # XXXXX) = $769.29 Labor R & R & Programming apprx 2 hours