When the meter is reading in the low voltage range described below as "normal" would a diagnostic tester see this as a regulator failure?
Voltmeter Fluctuation Condition:
Some customers may comment that the voltmeter is fluctuating between 12 and 14 volts on their full size pickup or utility vehicle. Starting with the 2005 model year, light duty full size pickups and utilities are equipped with a new Regulated Voltage Control (RVC) system. This system reduces the targeted output of the generator to 12.6-13.1 volts when in "Fuel Economy Mode" to improve fuel economy. The generator may exit "Fuel Economy Mode" if additional voltage is required. This will cause the voltmeter to fluctuate between 12 and 14 volts as opposed to non-regulated systems that usually maintain a more consistent reading of 14 volts. This fluctuation with the RVC system is normal system operation and NO repairs should be attempted.
How long has your 2015 GMC Sierra 1500 had this problem?
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Hello, I would not rely on a diagnostic tester that decides for you the condition of a voltage regulator based on a "range" within the diagnostic tester itself. Use test equipment that can measure output of the charging system and interpret the results based on the shop manual of the appropriate vehicle.
