

I am referring to when he has trouble turning into full-sized Titan after he
underwent intelligence and endurance testing. It happened in chapter 53 of the
series, during the Uprising Arc.

This is a quote from the [Attack on Titan
Wiki](http://shingekinokyojin.wikia.com/wiki/Eren_Yeager):

> During an experiment to test Eren's hardening abilities, a severed Titan
> form of Eren falls to the ground. Hange is unable to get a response from him
> and because Levi notices that this Titan is underdeveloped, Mikasa and Hange
> remove Eren's body from the Titan. [...]. A day later, Eren finally wakes
> up. He doesn't seem to remember anything from the experiment and is upset to
> find out that there were no signs of the hardening ability. Hange explains
> that since Eren transformed without being able to employ the hardening
> ability, they decided to run intelligence and endurance tests. [...].
> However, after one hour of testing, Eren suddenly, after writing something
> about his father, became unable to perform the tasks and eventually left his
> Titan body. After thirty minutes of rest, he transformed again. However,
> this time his Titan form was only 13 m tall, contrary to the usual 15 m, and
> couldn't perform any of the intelligence tests. For the third time, the
> Titan was only 10 m tall and was incomplete, with his human body being
> attached to it more firmly than before. Eren takes this news as a proof that
> the operation to retake Wall Maria cannot be performed at the moment.

Why did this happen and how was it resolved?


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attack-on-titan
What happened to Eren that made him unable to turn into a Titan in chapter 53 of the manga?


Nobody knows why this is happening. Even **Eren** can't remember what actually
happened and it has not been resolved till now(59). Currently they are
following **Erwin** 's plan. The question may be answered in the future.


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I'm pretty sure this is due to the fact that turning into a titan requires
energy. Serially turning into one like that was wearing him down, such that he
couldn't turn into the normal full-sized titan of normal titan intelligence.
If he burned enough energy as a titan or through regeneration, he would not be
able to turn into a titan at all for a while, as established much later in the
manga.


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The reason why Eren can't sometimes turn into a titan because he doesn't have
a objective to focus on, unlike his first transformation which he focus of not
dying and the vision of his mother, sometimes his anger trigger his
tranformation. For example, Annie's tranformation was easlier for her because
she had to be cold blooded when getting Eren. Before the last espiode Armin
told Eren to leave his humanity and became a monster to able to fight Annie. I
haven't read the manga but I do my research on Attack on Titan and I will read
the manga.


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The reason why he can't turn into a Titan at will is because he can only do so
if there is a set goal in mind. Which is also why he could not turn in to a
Titan when he was in the well, but later on when he was sitting at the table
with the rest of his squad and he dropped his spoon and then proceeded to pick
it up, he grew a Titan arm.


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Eren cannot transform, for purpose. Because it's is possibility that's
transform into titan will need sunlight and energy. I'm certain sure Eren need
sun light/energy and bite his finger at same time. In episode 23-24, Annie
avoided to go dark underground. If she went into and bite finger, she wouldn't
be able to transform. That's why Annie and others titan shifter alway on
outside in order to transform.


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I think eren didn't have enough energy and sunlight so he was not able to
transform into full titan. So thats why annie and zeke if always outside to
transform.


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The reason is the plot :D He had to be captured by Kenny's goons so the story
could happen :D

Ok, but with all seriousness, Eren needs to be strong, both mentally and
physically. After dozens of test he was probably. He didnt knew his limits
back then and before test he managed to fully transform only 3 times - all of
them very randomly.

Also i think it depends on how strong Titan Power is.

SPOILER: Carting Titan is probably the weakest, but can stay in titan form for
the longest. Colossal Titan is huge, so he is very concious about to when to
transform into one - Ww can see Nertholdt transformin io Collosal's upper body
in season 3, but then day later h is carried by Reiner. He never rly fights
back when he and Reiner are attacked by mindless titans even if they both
almost get eaten, so he probably needs a lot of energy to transform. Eren has
2 titan powers. His transformation is probably more demending than armored or
female titans.


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