Isuzu is recalling 21,000 trucks because the transmission bracket mounting studs could break, affecting the transmission’s ability to shift correctly.

The truck recall includes 2015-2017 NPR HD, NPR XD, NQR and NRR trucks equipped with 4HK1 diesel engines.

Debris in the stamping equipment may have created burrs on the frame crossmember that the automatic transmission is mounted to. As a result, these burrs can eventually cause the transmission mounting studs to break.

If the stud bolts break, the transmission could drop towards the driveshaft and the driver may not be able to shift properly.

“If the studs break, the transmission may not be properly supported, preventing it from shifting correctly and increasing the risk of a crash,” said the National Highway Traffic Safety Administration.

No crashes or injuries related to this issue have been reported.

To fix the problem, mechanics will install a metal shim “to prevent stress on the mounting studs,” the NHTSA said.

The recall is expected to start in April.

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