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The 2015 Jeep Grand Cherokee uses a 921 bulb for its reverse light. If your headlights go out, replacing them is a simple task and doesn't cost much. On average, each bulb will cost you between $10 and $20. To swap out the bulb, start by taking off the headlight cover, which is secured by a few screws. After removing the screws, the cover can be easily lifted off. Next, unscrew the bulb, similar to replacing a ceiling fan bulb, and remove it. Insert the new bulb, replace the cover, screw it back in, and don't forget to test the new bulbs.
The size of the reverse light bulb for the 2015 Jeep Grand Cherokee is designated as 921.