The purpose of the present paper is to study the influence of wall echo on pressure fluctuations
${p}^{\prime } $
, and on statistical correlations containing
${p}^{\prime } $
, namely, redistribution
${\phi }_{ij} $
, pressure diffusion
${ d}_{ij}^{(p)} $
and velocity pressure-gradient
${\Pi }_{ij} $
. We extend the usual analysis of turbulent correlations containing pressure fluctuations in wall-bounded direct numerical simulations (Kim, J. Fluid Mech., vol. 205, 1989, pp. 421–451), separating
${p}^{\prime } $
not only into rapid
${ p}_{(r)}^{\prime } $
and slow
${ p}_{(s)}^{\prime } $
parts (Chou, Q. Appl. Maths, vol. 3, 1945, pp. 38–54), but also further into volume (
${ p}_{(r; \mathfrak{V})}^{\prime } $
and
${ p}_{(s; \mathfrak{V})}^{\prime } $
) and surface (wall echo,
${ p}_{(r; w)}^{\prime } $
and
${ p}_{(s; w)}^{\prime } $
) terms. An algorithm, based on a Green’s function approach, is developed to compute the above splittings for various correlations containing pressure fluctuations (redistribution, pressure diffusion, velocity pressure-gradient), in fully developed turbulent plane channel flow. This exact analysis confirms previous results based on a method-of-images approximation (Manceau, Wang & Laurence, J. Fluid Mech., vol. 438, 2001, pp. 307–338) showing that, at the wall,
${ p}_{(\mathfrak{V})}^{\prime } $
and
${ p}_{(w)}^{\prime } $
are usually of the same sign and approximately equal. The above results are then used to study the contribution of each mechanism to the pressure correlations in low-Reynolds-number plane channel flow, and to discuss standard second-moment-closure modelling practices.