What does code P2558 mean?

Q: What does code P2558 mean?

Engine Coolant Level Sensor/Switch Circuit Low. P2558 indicates that the engine control module (ECM) has detected a low-voltage condition on the engine coolant level sensor or switch circuit, meaning the signal wire is reading below the expected threshold. This typically occurs when the coolant level is low, the sensor is faulty, or there is a wiring issue causing the circuit to short to ground or lose its reference voltage.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P2558

P2558Engine Coolant Level Sensor/Switch Circuit Low

P2558 indicates that the engine control module (ECM) has detected a low-voltage condition on the engine coolant level sensor or switch circuit, meaning the signal wire is reading below the expected threshold. This typically occurs when the coolant level is low, the sensor is faulty, or there is a wiring issue causing the circuit to short to ground or lose its reference voltage.

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.