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I have 42,000 miles on my '14 JGC Diesel. For the last few days, I have thrown a P0128 code, although it went away this morning.

Computer reads that it is a faulty Engine Coolant Thermometer, although I am getting thermometer read outs on the dash, and now no issues on the code either...

Any experience on this from other folk? Only issues I've had since I bought it all revolve around the Diesel Filter. I had to replace the Catalytic Converter about 6 months ago after repeated refusal to regen the system. Otherwise all happy.
 

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No responses? I'm having the same issue with that code. The Thermostat was already replaced and the temp gauge is in the middle. Is there a different temperature sensor besides the one by the thermostat (which is tied to the gauge)?
 
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