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    My 2021 Isuzu MU-X automatic keeps changing gears at strange times

    Isuzu Isuzu Advice Isuzu MU-X Isuzu MU-X Advice Isuzu MU-X 2021

    Our 2021 Isuzu MU-X automatic keeps changing gears at unusual times; for instance, when towing, turning corners, when a truck or another van passes in the opposite direction, or when you hit a bump in the road. When going uphill, it changes down okay but then, when pulling it tries to go into next gear up, then changes back again, losing power and having to work harder to get up the hill. Then, when on flat ground after pulling or going downhill it does not want to go back up into the next gear. We've tried manually changing gear but it does not respond sometimes to such requests yet the dashboard shows it is in the next gear. The rev counter says otherwise. I have asked dealers at the last two services to check, and they say all is okay and are not prepared to go further.

    Answered by CarsGuide
    17 January 2024
    David Morley

    It sounds very much like the transmission is confused electronically or has a problem with its valve body which is supposed – in conjunction with the computer – to make decisions about what gear the transmission should be in. Perhaps it's as simple as a dodgy electrical connection somewhere and the impact of potholes or buffeting from passing trucks is causing a short-circuit somewhere.

    The first piece of advice, however, is to not drive the vehicle any farther. You not only risk damaging the transmission, but it's also dangerous to drive a vehicle that might suddenly select the wrong gear at random. The second piece of advice would be to take the vehicle to a dealership and have its computer scanned to see if any fault codes have been recorded. If your local dealer doesn't want to know, take it straight to head office and contact Isuzu's customer service division.

    The good news is that your vehicle is still under the factory warranty, so make it Isuzu's problem, not yours. Just make sure that the behaviour has been logged as a problem, at which point it's classed as a pre-existing condition and Isuzu is still obliged to fix it even if the warranty runs out.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.
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