P0118 Code / Limp Mode / Service Electronic Throttle Control -> Fixed

[Gladiator_92]

EcoDiesel with 9880 miles. I have gotten the P0118 code (Engine Coolant Temp sensor circuit high) 2 or 3 times in the last 5000 miles, randomly. Rad fan goes to 100% with check engine light. I clear the code and I'm fine for another few months. Recently, the code came back and would continue to return after clearing it. I noticed on my banks gauge that the ECT was all over the place. -40, to 150 to 205 to 170, etc.. Then came "Service electronic throttle control" and limp mode capped out at 40mph... called dealer and they were a week out for an opening in service. With that, I bough the Mopar ECT sensor for $49 on RockAuto swapped it out.

For the next few warm up cycles I noticed the temp would still fluctuate but only within 10-15 degrees of the oil temp. My though is either ECM is screwed or some air pockets in the coolant lines since I swapped the sensor. All good now it seems...

Figured I would share.

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[Gladiator_92]

***Edit*** this was the real problem: https://www.jeepgladiatorforum.com/...18-service-electronic-throttle-control.50668/

 

[ivanfrank]

Thanks for posting this and the resolution. We just picked up our gladiator from the dealer new and on the drive home got the ETC error and limp mode too.. gives me some piece of mind there's something I can check if the dealer can't figure it out.

 

[Gladiator_92]

Thanks for posting this and the resolution. We just picked up our gladiator from the dealer new and on the drive home got the ETC error and limp mode too.. gives me some piece of mind there's something I can check if the dealer can't figure it out.

No problem! But I would check it yourself first since my dealer could figure it out when i dropped mine off. They just run an OBD check and then look for codes. They dont check fuses or connections it seems....

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