What does code P1198 mean?

Q: What does code P1198 mean?

Radiator Temperature Sensor Voltage Too High. P1198 on GM vehicles means the engine control module (ECM) has detected a voltage signal from the radiator temperature sensor that is higher than the expected range, typically above 4.5 volts. This high voltage indicates an open circuit, a disconnected sensor, or a sensor that has failed in a way that prevents it from pulling the signal voltage down to a normal level.

DTC codes / GM codes / P1198

P1198 · GMRadiator Temperature Sensor Voltage Too High

P1198 on GM vehicles means the engine control module (ECM) has detected a voltage signal from the radiator temperature sensor that is higher than the expected range, typically above 4.5 volts. This high voltage indicates an open circuit, a disconnected sensor, or a sensor that has failed in a way that prevents it from pulling the signal voltage down to a normal level.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

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