TSB: Buick No Start

Buick vehicles from 2021 to 2023 may experience engine stalling, loss of power, or erratic fuel gauge readings due to a faulty K111 FPDCM. If standard diagnostics do not identify the issue, replacing the module is advised to restore vehicle performance.
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May 26, 2026
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Buick No Start

This bulletin applies to 2021-2023 Buick Enclave, Encore GX, Envision, Lacrosse and Regal vehicles. The vehicle may exhibit a crank-no-start, rough idle, stall, loss of power and/or inoperative or erratic fuel gauge. DTC P129F and/or P023F may be set in the ECM. This condition may be caused by an internal short in the K111 fuel pump driver control module (FPDCM). If normal diagnostics do not reveal the issue, replace the K111 FPDCM.

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