Can the 2025 Jeep Grand Cherokee L make a U-turn?

Yes. Fits a 40 ft street.

39.6ft curb to curb

Street width, feet

Street 40 feet curb to curb.

2025 Jeep Grand Cherokee L Laredo 4x2. Top view, to scale.

2025 Jeep Grand Cherokee L: turning circle by trim, 40 ft street
Trim	Circle, ft	Margin	One move
Laredo 4x2	39.6	+0.4 ft	Yes
Laredo X 4x2	39.6	+0.4 ft	Yes
Altitude 4WD	39.6	+0.4 ft	Yes
Altitude X 4WD	39.6	+0.4 ft	Yes
Laredo 4WD	39.6	+0.4 ft	Yes
Laredo X 4WD	39.6	+0.4 ft	Yes
Altitude 4x2	39.6	+0.4 ft	Yes
Altitude X 4x2	39.6	+0.4 ft	Yes
Limited 4x2	39.6	+0.4 ft	Yes
Limited 4WD	39.6	+0.4 ft	Yes
Overland 4WD	39.6	+0.4 ft	Yes
Summit 4WD	39.6	+0.4 ft	Yes
Summit Reserve 4WD	39.6	+0.4 ft	Yes

What this cannot tell you

Curb-to-curb turning circle as listed.

Mirrors and overhang need more room.