so today I was going on about a 30 minute drive. I always seem to monitor my EOT and ECT, and they usually average about 15 degree difference. Well today other things started happening. After about 25 min of the drive I started noticing both of the temps started stretching and soon to be about a 23 degree difference and my wrench light came on which is the electronic throttle control. I monitor the temps with my SCT livewire monitor so of course went to go check the dtc codes. Turns out it threw a P012f code saying “Engine Coolant Temperature / Engine Oil Temperature Correlation”. I eventually got to the place I was going to and turned off the truck and cleared the codes and turned the truck back on and it never came back on again. So I then leave after the truck was sitting for about 2 hours and go back home my trucks EOT was reading 193 and my ECT was 174 being a 19 degree difference. I need help on where to start looking, I was guessing and thinking it was egr cooler and oil cooler but not quite sure
Campos02
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2,146 Posts
Check your temps after a 10 hour cold soak with the engine not running. That should give enough time for everything to cool down to the same temp as the air. If the EOT and ECT aren't really darn close to each other, you've got a sending unit problem. If, however, they are the same, and you then get EOT at 15 degrees higher than your ECT (once your engine is fully up to temp and you have run at least 20 minutes at 55-60 MPH) then you have a clogged oil cooler. You can try unclogging it via a backflush, but very few have had good luck. I was one of the lucky few, but I also spent about eight hours total on it. lol
And, yes, if you're worried about the coolant levels, pressure test it. Just make sure you get up to operating temp and then SLOWLY vent the cooling system while it's running. Then, after that, watch your pressure. Mine rose quite slowly, even with a WOT run, because I was just developing the HG leak, but it did eventually get up to 16PSI. Guess I'm just saying don't necessarily expect to see it spike to 16 right from the start. May take a few. Now let's hope you don't have any movement on that gauge at all! lol
And, yes, if you're worried about the coolant levels, pressure test it. Just make sure you get up to operating temp and then SLOWLY vent the cooling system while it's running. Then, after that, watch your pressure. Mine rose quite slowly, even with a WOT run, because I was just developing the HG leak, but it did eventually get up to 16PSI. Guess I'm just saying don't necessarily expect to see it spike to 16 right from the start. May take a few. Now let's hope you don't have any movement on that gauge at all! lol
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