DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P056C
P056C indicates that the cruise control system has received a cancel signal, meaning the engine control module (ECM) or cruise control module detected an input that commanded the cruise control to disengage. The computer sets this code when it sees a cancel request from a switch, sensor, or related system without a corresponding fault in the cruise control engagement circuit.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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