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I have always aimed under load (Such as hills) at keeping the engine in between peak torque and peak power RPM, roughly midway between the two although for a lot of oilers that is not saying a lot as they have quite a low power peak RPM. Looking at the COlerados specs that would put it about 2750RPM. It probably does not have closed loop boost control so it may well be simply going into an overboost situation given a combination of high load and high RPM (Given the boost related code)
I would first do as Glen suggests, manually select a gear that keeps it between 2500 and 3000RPM and if you have to, kill the cruise control and let the speed trail off a bit if that is what it takes to keep it out of limp home.
Last edited by The_bluester; 23-02-2020 at 04:35 PM.
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