What does code P2556 mean?

Q: What does code P2556 mean?

Engine Coolant Level Sensor/Switch Circuit. P2556 indicates that the engine control module (ECM) has detected an abnormal signal from the engine coolant level sensor or switch circuit, meaning the circuit voltage is outside the expected range for the current coolant level. The ECM uses this input to warn the driver of low coolant, so the code sets when the signal does not match the model's logic for a key-on or running condition.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P2556

P2556Engine Coolant Level Sensor/Switch Circuit

P2556 indicates that the engine control module (ECM) has detected an abnormal signal from the engine coolant level sensor or switch circuit, meaning the circuit voltage is outside the expected range for the current coolant level. The ECM uses this input to warn the driver of low coolant, so the code sets when the signal does not match the model's logic for a key-on or running condition.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.