Zombie

Sadly, we are cheated a "Brawn of the Dead" pun-reference.

Don't you know?! The dead -- the dead walk the streets of Kalis! And their victims... their victims become like them -- the living dead!Battletrap in City of Fear!, Part 1

Although Transformers are often rebuilt or otherwise brought back from apparent death, there are also many examples of them being partially reanimated as zombies, either self-aware or under the control of another.

Quick list of Transformers zombies/the undead

Generation One

• Flame's army of zombies, which included the undead Impactor
• Optimus Prime
• Starscream
• Playback
• The bodies remote-controlled by Blackjack
• Black Zarak and possibly the rest of the Nine Great Demon Generals

Note: Metrotitan is not a reanimated Metroplex as is commonly believed.

Beast Era

• Galvatron
• Optimus Primal's original body
• Tarantulas
• The bodies inhabited by Megatron

Unicron Trilogy

• Dark Scorponok
• Starscream
• Dark Crumplezone

Fiction

Marvel Comics continuity

We take Pete's car, we drive over to mum's, we go in, take care of Phillip, then we grab mum, we go over to Liz's place, hole up, have a cup of tea and wait for this whole thing to blow over.

So, bereft of its brain module, a Transformer body is just so much circuitry, operable by a powerful computer signal!Ultra Magnus in City of Fear!, Part 2

(Note: Events in italics occurred in UK-only material.)

Ultra Magnus and the Sparkler Minibots, traveling via dimensional portal to the new home of Emirate Xaaron's resistance movement in Kalis, arrived to find the place vacant and ransacked by beings unknown. After capturing the Decepticon Battletrap in Tyrest and bringing him back into Kalis, their captive shook with fear. The dead walk in Kalis!, he warned, as the fists of the unliving punched up through the ground beneath them. City of Fear!, Part 1

Though Ultra Magnus refused to return Battletrap's gun to him, the Decepticon helped Magnus and the Sparklers beat back the undead hordes. Their attempts, however, seemed futile -- no matter how hard their attackers were damaged, they still functioned! Finally, Battletrap and the Sparklers reverted to vehicle mode, where they could use their weapons to destroy the zombies more effectively. But alas, Magnus was stunned to realize that the beings they put down were formerly Autobots. Realizing that the zombies were being animated by remote using a radio signal, they travelled ten kliks outside Kalis to the Baird Beaming Transmitter. The signal was indeed shut down, and Magnus discovered that the signal was coming from deep within Cybertron... City of Fear!, Part 2

Two seconds!

From Teletraan I: The Transformers Wiki, a Wikia wiki.