Engine - Overheating Produces DTC P0480

Engine Overheats, DTC P0480 Is Set

Got a 05 RL in your shop for an overheating engine'? Find out if your service client had any recent problems with a dead battery. If the answer is yes, chances are the No.34 (50A) fuse in the battery terminal fuse box is blown.





This fuse is a bolt-in type, and it makes a convenient place to jump start the battery. But, if you connect the positive jumper cable to the bolt, you can blow this fuse. If it blows, the radiator fans stop working and DTC P0480 (RFC system malfunction) sets. Since, by design, this DTC doesn't turn on the MIL, you really won't notice there's a problem until it's too late and the engine overheats.

So here's the bottom line: Before you consider yanking out and replacing cooling-related components for an engine overheating problem, first check for a blown No.34 filse; it may well be the guilty party. Warranty analysis has found a number of returned cooling-related parts to be NTF because the blown filse was the real cause.