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Buick Shows False Codes

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A sporadically unlocked exhaust cam phaser that can oscillate during engine start is likely falsely setting DTCs on some Buick Cascada vehicles.

| Photo Credit: GM

Some owners of 2017-2018 Buick Cascada vehicles equipped with a 1.6L engine may comment that the MIL is on. DTCs P0366 and P0014 may be set. This condition may be caused by a sporadically unlocked exhaust cam phaser that can oscillate during engine start, falsely setting the DTCs.

Update the ECM to the latest calibration.

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