Thread: Failsafe Engine Prog message with trifecta
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Old 06-21-2025, 10:18 PM
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andrewwynn andrewwynn is offline
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If it clears it is likely alternator.

Monitor voltage live and see what happens when you come to a stop and go from power on to coasting.

If the voltage dips below 12.5 almost always alternator failure and the first sign is often trifecta and trans failsafe even before you get battery light for some reason.
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