![]() I think we've seen a fair number of examples of alerts and responses that could be described as "heavy handed" considering what the actual circumstances are that trigger them? So I'm guessing it's an alert driven by sensors associated with the exhaust heat exchanger, but the engineers built in the verbiage of the alert and the engine management (pcm) response. It's obviously not an alert driven by the engine coolant temperature sensor that reports to the instrument cluster. But it appears that both the code and the response are actually preemptive to the condition they describe? Or put another way, code exists for the circumstance of the heat exchanger malfunction, and that code triggers both the alert and the engine management response. Since we have seen this issue be associated with the Exhaust Heat Exchanger malfunctioning and it triggers a coolant temperature alert that's theoretical, rather than actual. It could be, but derating the internal combustion engine doesn't make much sense in that scenario. I am not sure that it has anything to do with the Hybrid/Electric coolant loop or temps. This service dept was super courteous, stuck to the scheduling, and seemed to be a well run shop, though. Gave me the truck back with a 6-8 month back order on the heat exchanger. ![]() Apparently the parts they had were for the nipple replacement TSB. They confirmed the diagnosis and said they would have the new part installed and be ready for pick up in two days! At Tonkin Ford in Hillsboro, OR with only a one week wait. If you’ve actually had success in addressing this, please post here under this specific heading. I’m baffled and wondering if the louvers in front of the radiator may not be operating correctly? This truck is certainly not suited for hauling/trailering if this can’t be resolved. All fluids (etc.,etc,etc) are good, and I run 92 octane fuel. Normally, I see 190-198 on these same routes. It’s intermittent, with no consistency, but the digital temp is usually in the 208-220 range if it goes off. I keep getting it while running unloaded at 60-70 mph down the freeway in 65-85 degree weather. Has anybody actually found the cause and verified fix for this issue? I’ve read through posts/forums/Google till I’m blind, and maybe I missed it, but…
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