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  1. Check engine light with code U034B after recall for battery replacement and software update 2021 Big Bend

    Yes, that is where the module is located. Vehicle has never been submerged in any way, but we do live in Western Washington close to the Cascades. The saying is, 'we don't tan, we rust.' 😁

  2. Check engine light with code U034B after recall for battery replacement and software update 2021 Big Bend

    Thank You for this information Robert. When I found out where the PCM is located on the 21 Big Bend, I am surprised that this isn't a large problem for many owners of this model.

  3. Check engine light with code U034B after recall for battery replacement and software update 2021 Big Bend

    After a diagnostic and battery test, battery tested good and diagnostic, tech says they think problem is gone, but drive it over the weekend and see. Well, first a warning square and bells saying service transmission but no cel. Next day, same warning with cel. Dtc's exactly the same as before...

  4. Check engine light with code U034B after recall for battery replacement and software update 2021 Big Bend

  5. Check engine light with code U034B after recall for battery replacement and software update 2021 Big Bend

    I had a suspicion that this might be a problem so made sure all of the battery connections were tight. U034B popped up again. Could it possibly be a bad ground connection in the AWD module? Thanks for your response.

  6. Check engine light with code U034B after recall for battery replacement and software update 2021 Big Bend

  7. Check engine light with code U034B after recall for battery replacement and software update 2021 Big Bend

    Ever since the recall for a new battery and software update on our 2021 Bronco Sport Big Bend, we have been getting check engine light with code U034B popping up. Took it to dealer and they could not identify any problem. This issue seems to only be happening after going over bumpy areas (i.e...




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