  In this work, we have calculated the polar gravitational quasinormal modes
for a quantum corrected black hole model, that arises in the context of Loop
Quantum Gravity, known as Self-Dual Black Hole. In this way, we have calculated
the characteristic frequencies using the WKB approach, where we can verify a
strong dependence with the Loop Quantum Gravity parameters. At the same time we
check that the Self-Dual Black Hole is stable under polar gravitational
perturbations, we can also verify that the spectrum of the polar quasinormal
modes differs from the axial one \cite{Cruz:2015bcj}. Such a result tells us
that isospectrality is broken in the context of Self Dual Black Holes.
