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15v is not too high for AGM batteries. The vehicle comes stock with an AGM battery and a charging system designed for AGM batteries. 15v or higher would be too much for a standard wet cell battery, but AGM batteries are designed for this. The vehicles charging system also monitors battery state of charge and adjusts voltage accordingly. Your fault codes are not likely related to the battery. A circuit high fault is usually an open circuit. You need a wiring diagram and a digital multimeter to check the circuit in question.
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