My 2018 Isuzu D-Max ute won't exceed 20km/h
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Asked by Mark
My 2018 Isuzu D-Max was going well pulling a trailer, but now won’t change gears and will only do 20km/h.
Answered by CarsGuide
4 Mar 2025It sounds very much like the vehicle has gone into limp-home mode. This is a self-preservation system whereby the engine and drastically reduces the power it’s producing, limits top speed and often locks the transmission into a low gear. Something has happened that has caused this, and a common reason is that something in the engine, fuel system, or (more likely) the transmission has started to get too hot with the strain of towing.
With luck, full operation will be restored once the vehicle has been allowed to cool down. But you may need to visit a dealership to have things reset. It’s always a good idea to do a full engine and transmission fluid and filter change after any overheating event anyway.
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