carfobbattery

Ram 2500/3500 (HD) key fob battery

Every model year listed for the Ram 2500/3500 (HD) has a proven battery. The most common answer is CR2032. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.

  1. 2019-2021Smart key

    CR2032

    FCC ID GQ4-76T

    Two sites agree: uhs-hardware.com and odoo16demo.transponderisland.com (checked Nov 1, 2026)

    Find CR2032 on Amazon
  2. 2022-2024Smart key

    CR2032

    FCC ID GQ4-76T

    Two sites agree: locksmithkeyless.com and odoo16demo.transponderisland.com (checked Nov 1, 2026)

    Find CR2032 on Amazon

Changing the battery

Smart key (push-button start)

  1. Most push-button fobs hide a metal backup key. Press or slide its catch and draw the key out first.
  2. The gap left by the metal key usually has a pry point. A slow twist with a thin flat tool (tape on the tip saves the plastic) opens the two halves.
  3. Before you take the old cell out, look at its face. Put the new cell in with the same side showing, and avoid touching both faces at once.
  4. Reassemble, refit the emergency key, and check that the car sees the fob when you press start.

A CR2032 is 20 mm across and 3.2 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.

If a child might have swallowed a coin cell, treat it as an emergency and get to a hospital right away.

Other Ram models