The electric vehicles were built by Alexander Dennis at its manufacturing base in Larbert at a cost of £19.7m.
A spokesman for Alexander Dennis said: “A structural issue has been identified on some BYD AD Enviro200EV electric buses built in 2021.
“The affected vehicles have been removed from service as a precaution. Alexander Dennis is fully supporting the customer and, along with BYD as the relevant component manufacturer, has developed a rectification which is being applied to all affected vehicles to resolve the issue.”
First Bus said the vehicles would make the Glasgow fleet emission free, saving “over 3,000 tonnes of CO2e per year as they replace older diesel buses”.
Funding was supported by Transport Scotland through its Scottish zero emission bus (ScotZEB) funding.
Rapid charging points were also installed at the First Bus Caledonia and Scotstoun depots.
Alexander Dennis has been approached for comment.
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