carfobbattery

Hummer H3T key fob battery

Every model year listed for the Hummer H3T 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. 2009Remote (separate)

    CR2032

    FCC ID L2C0007T

    Owner's manual: carmanualsonline.info and uhs-hardware.com (checked Nov 1, 2026)

    Manual text: “Insert the new battery. Replace with a CR2032 or equivalent battery.”

    Find CR2032 on Amazon
  2. 2010Remote (separate)

    CR2032

    FCC ID L2C0007T

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

    Find CR2032 on Amazon

Changing the battery

Separate remote fob

  1. The remote is a small standalone unit. You will not need to touch the ignition key at all.
  2. Find the slot along the edge and turn a coin in it. Go slowly so the clips do not snap.
  3. Swap the cell or cells, keeping the same side up as the old ones.
  4. Snap the case shut and watch for the lights to flash when you press lock at the car.

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 Hummer models