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One of the most common reasons why a 2011 Jeep Grand Cherokee's push-button start may not function is due to a drained key fob battery. The push-to-start system relies on the key fob being both charged and in close proximity to the vehicle. To troubleshoot, ensure the key fob is inside the car with you. If it is and the push-to-start still doesn't work, then check the key fob battery and replace it with a new CR2032 battery if needed. If replacing the battery doesn't solve the issue, then inspect the car battery to ensure the terminals are properly connected.
If your 2011 Jeep Grand Cherokee's push-button ignition isn't functioning, it's advisable to inspect the battery.