The song of Speckle-chested Piculet is similar to that of many other species of Picumnus, "a high-pitched, rapid, falling trill: tree'e'e'e'e'e'e" (Lane, in Schulenberg et al. 2007).
For a representative audio recording with sonogram, see audio
Juveniles reported "noisily begging" for food from attending adults, but begging calls not described (Parker and Parker 1982).
Additional recordings of vocalizations of Speckle-chested Piculet can be heard at xeno-canto.