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The fuse feeding the brake lights, blown so the lamps and everything sharing the circuit stop working. The brake light circuit does far more than illuminate lamps — it tells the engine module the brake is applied, releases the shift lock, disengages cruise control and is used by stability systems.

So a blown fuse produces a set of unrelated-looking faults at once: a selector that will not leave park, cruise control that will not engage, and a stored brake switch code. A vehicle stuck in park with no brake lights is this, and it is a fuse rather than a transmission problem — which is worth knowing before anything is dismantled.

A fuse is a symptom. Water in a rear lamp cluster, a corroded bulb holder shorting, or a chafed harness at the tailgate hinge are the usual causes. Check the lamp units and the tailgate loom before fitting a replacement — and note that a trailer socket wired incorrectly is a frequent cause on vehicles that tow.