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    I replaced the starting battery in my 2014 Mazda BT-50 and now I have the powertrain light come on when driving

    Mazda Mazda Advice Mazda BT-50 Mazda BT-50 Advice Mazda BT-50 2014

    Just replaced the starting battery in my 2014 Mazda BT-50 and now I have the powertrain light come on when driving. Never had a problem before changing battery. What's the issue here?

    Answered by CarsGuide
    15 February 2023
    David Morley

    It's quite probable that the check-engine light was triggered by the worn out condition of the battery you replaced, not the brand new one being fitted. Such cars hate low voltages, and that's precisely what a worn battery produces. That said, changing the battery can sometimes cause a modern, computerised car to throw a fault code, and when that happens, the check-engine light will illuminate.

    You can try to re-set the vehicle's computer by disconnecting the battery and leaving it for an hour. Then reconnect the battery and see if the light has disappeared. If it hasn't, it may be that the computer simply needs to relearn a few parameters after having been disconnected from the power when the original battery change was made. A decent drive might return things to normal.

    But don't forget the basics: Check the condition and cleanliness of the battery leads, terminals and make sure that all the connections are tight. If there's still no joy, have the vehicle electronically scanned and let the computer tell you precisely what's wrong.

    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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