What does code P1489 mean?

Q: What does code P1489 mean?

High Speed Fan CTRL Relay Circuit Open Or Shorted. P1489 on a GM vehicle means the engine control module (ECM) has detected an open or shorted circuit in the high-speed cooling fan control relay circuit. The ECM commands the relay on or off and monitors the circuit for expected voltage, so this code sets when the feedback does not match the command.

DTC codes / GM codes / P1489

P1489 · GMHigh Speed Fan CTRL Relay Circuit Open Or Shorted

P1489 on a GM vehicle means the engine control module (ECM) has detected an open or shorted circuit in the high-speed cooling fan control relay circuit. The ECM commands the relay on or off and monitors the circuit for expected voltage, so this code sets when the feedback does not match the command.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

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