My truck was having overheating problems and ended up being the clutch fan, replaced it and then truck started throwing the p1281 code which is engine cool to long. I switched out the aftermarket 180 tstat I had installed this summer with a factory 195 and when cruising down the highway the check engine light will flash and when I check the codes I still get the p1281! The truck is running right below 210 were it should be and I e tried unhooking the battery to reset it. But still no luck. The truck kinda sputters on the highway then the CEL flashes, which I think it's the. Computer trying to fix the temp problem but that is he only code I get. Any ideas? It's in an 01 Dakota sport 4x4 with the 5.9 about a month ago I also had the water pump replaced and did the spark plugs yesterday along with the clutch fan and new 195 tstat

 

P1281 is usually a bad thermostat so that's where I'd have started too. The flashing CEL is a bit odd however. Usually when it flashes it refers to a misfire - you say it sputters.

What are you using to read the codes? Have you tried the key trick?

 

That's what I used to pull the code, I waited till I got home and did the key trick. We're should I start in looking for a misfire?

 

The temperature sensor that the gauge uses is the same one that the PCM uses so it's unlikely it's failed. Still, double check that the connector is clean and tight.

How are the plugs, cap, rotor? A "sputter" is usually a fuel problem. How's the fuel rail pressure? How many miles on the truck?

It's really odd you aren't throwing a code for a cylinder misfire though.

 

I killed all the lights in the garage and looked at the running motor, I am Getting spark/contact threw the coil wire to the closest metal point which was my valve cover. Heading to get a new set of wires right now.

 

Yup, that'd account for a misfire.

 

And a misfire code. Nice catch!

 

Well got it fixed new plug wires and she runs like a champ! Thanks for the help guys!

 

note to self, do this for my truck. old plug wires + multiple misfires on mine (but I really think it's timing related from the race config)