Chevrolet Uplander charging system failure after alternator replacement and battery recharge on Chevrolet Uplander

Some Chevrolet Uplander owners report experiencing ongoing charging system failures even after replacing the alternator and recharging the battery. These issues may stem from faulty battery terminals, which can disrupt the charging process. Additionally, a malfunctioning Electronic Control Module (ECM) could further complicate the situation, as it is vital for the charging system's operation. Even after an alternator replacement, underlying problems with the alternator itself may persist, contributing to the failure. In some cases, owners find that replacing the Powertrain Control Module (PCM) is necessary to resolve the issue, especially if warning messages continue. To accurately diagnose the cause of the charging system failure, it is recommended to use a diagnostic scan tool to read any trouble codes related to the battery, alternator, or electrical wiring.