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Discussion Starter #1 (Edited)
I have a 2010 Dodge Grand Caravan with the 4.0L SOHC engine and my check-engine and ETC lights came on the other night. When I pulled the codes, P0118 (Engine Coolant Temperature Circuit High Input) and P2181 (Engine Coolant Temperature Performance) came up.

I checked coolant level which was fine, the temp. gauge bobbles a bit but looks correct, and I measured just under 6V at the sensor connector with the engine running. I measured ~11k ohms across the sensor with the engine cold and I watched it gradually decrease to ~3.5k ohms as the engine warmed up which is directionally correct, but I don't know what the exact specs are for the sensor.

In summary, the wiring and sensor seem fine. Anyone else with this problem? Anyone know of a TSB requiring a PCM reflash for this? Any help would be appreciated.
 
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