  While the factorization assumption works well for many two-body nonleptonic
$B$ meson decay modes, the recent measurement of $\bar B\to D^{(*)0}M^0$ with
$M=\pi$, $\rho$ and $\omega$ shows large deviation from this assumption. We
analyze the $B\to D^{(*)}M$ decays in the perturbative QCD approach based on
$k_T$ factorization theorem, in which both factorizable and nonfactorizable
contributions can be calculated in the same framework. Our predictions for the
Bauer-Stech-Wirbel parameters, $|a_2/a_1|= 0.43\pm 0.04$ and $Arg(a_2/a_1)\sim
-42^\circ$ and $|a_2/a_1|= 0.47\pm 0.05$ and $Arg(a_2/a_1)\sim -41^\circ$, are
consistent with the observed $B\to D\pi$ and $B\to D^*\pi$ branching ratios,
respectively. It is found that the large magnitude $|a_2|$ and the large
relative phase between $a_2$ and $a_1$ come from color-suppressed
nonfactorizable amplitudes. Our predictions for the ${\bar B}^0\to
D^{(*)0}\rho^0$, $D^{(*)0}\omega$ branching ratios can be confronted with
future experimental data.
