Diagnosing a 3.6L "Pentastar" Jeep JK Radiator Fan Issue (Code: P0480)

Recently, I was driving my 2015 Jeep Wrangler JK Unlimited through a parking lot on a 95 degree day, and after leaving a stop sign, a check engine light flashed on (later I would learn it was a P0480 Cooling Fan Relay 1 Control Circuit), and shortly thereafter my Jeep overheated. What followed was a multi-day Google searching and diagnostic session, which made me realize there is a lack of information as well as a lot of mis-information about the 3.6L “Pentastar” Jeep Wrangler model years, and how the radiator fan works.

This is my summary of what I learned about the cooling fans on these Jeeps, so hopefully more people can diagnose issues themselves.

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