  Current template-based gravitational wave searches for compact binary
coalescences (CBC) use waveform models that neglect the higher order modes
content of the gravitational radiation emitted, considering only the
quadrupolar $(\ell,|m|)=(2,2)$ modes. We study the effect of such a neglection
for the case of aligned-spin CBC searches for equal-spin (and non-spinning)
binary black holes in the context of two versions of Advanced LIGO: the
upcoming 2015 version, known as early Advanced LIGO (eaLIGO) and its
Zero-Detuned High Energy Power version, that we will refer to as Advanced LIGO
(AdvLIGO). In addition, we study the case of a non-spinning search for initial
LIGO (iLIGO). We do this via computing the effectualness of the aligned-spin
SEOBNRv1 ROM waveform family, which only considers quadrupolar modes, towards
hybrid post-Newtonian/Numerical Relativity waveforms which contain higher order
modes. We find that for all LIGO versions, losses of more than $10\%$ of events
occur for mass ratio $q\geq6$ and $M \geq 100M_\odot$ due to the neglection of
higher modes. Moreover, for iLIGO and eaLIGO, losses notably increase up to
$(39,23)\%$ respectively for the highest mass $(220M_\odot)$ and mass ratio
($q=8$) studied. For the case of early AdvLIGO, losses of $10\%$ occur for
$M>50M_\odot$ and $q\geq6$. Neglection of higher modes leads to
observation-averaged systematic parameter biases towards lower spin, total mass
and chirp mass. For completeness, we perform a preliminar, non-exhaustive
comparison of systematic biases to statistical errors. We find that, for a
given SNR, systematic biases dominate over statistical errors at much lower
total mass for eaLIGO than for AdvLIGO.
