Plays an important role in bacterial chemotaxis signal transduction pathway by accelerating the dephosphorylation of phosphorylated CheY (CheY-P). Dephosphorylates also CheV2 but not CheV1 or CheV3 (PubMed:20497335). In addition, forms a distinct chemotaxis regulatory complex with ChePep independently of the core chemotaxis signaling proteins (PubMed:26061894). Interacts with ChePep; this interaction is essential for each other polar localization. Localizes to the cell poles. Belongs to the CheZ family.