My Jeep had been sitting in the garage for maybe a week. So I decided to start it up one day, and was greeted with a new chime, and the dreaded Check Engine Light.
I ran my diagnostics through the Bully Dog, and the result was surprising – it returned codes for P0113 – Intake Air Temperature Sensor Circuit High, and P0480 – Fan 1 Control Circuit.
I forced the fan on via the Bully Dog, and nada. As a friend of mine recently replaced his fan assembly, I figured I was also looking at a $120 bill and 10 minutes of work. Well I was wrong. He has the 3.8l. The new fan (OEM replacement) is a whopping $500 and very hard to find in stock.
With my wedding approaching (and the Jeep playing a key role in it) I was desperate to find out what was happening.
- Fuse and relay check. I purchased some new fuses, and replaced it. I ensured all relays and other stuff was firmly seated.
2. I inspected all wiring for abrasions and issues.
3. Last, I went on eBay and found a listing for a new fan for $300.
Before getting the new fan, a good friend came over with a much better understanding of vehicle electronics, and helped me further diagnose.
We soon found the problem! There are 3 wires that comprise the fan harness. Black is ground, red is hot, and green carries a signal between 9v-12v and that basically allows the fan to operate on a scale based on engine temps. It isn’t a straight on/off fan.
That little green wire had some sort of a short in the connectors. We disassembled the connectors, reseated everything, and put everything back together. I cleared the codes, and it has been great ever since.
So, before you panic and replace a $500 fan, check your wiring!
PS. To the eBay seller in Miami that graciously let me cancel my order, thank you!!!