High Speed Fan Clutch Circuit Too High (Chrysler)
What does P1489 mean?
The P1489 code means the vehicle's onboard diagnostic system has detected: High Speed Fan Clutch Circuit Too High (Chrysler). This is a moderate severity code.
Common Symptoms
- Radiator fan runs at high speed constantly
- Check Engine Light illuminated
- Excessive fan noise especially at idle
- Slight reduction in fuel economy
- Engine may run cooler than normal
Probable Causes (Ranked by Likelihood)
- Short to power in the fan clutch solenoid circuit Very High
- Failed electronic fan clutch stuck engaged High
- Wiring shorted to battery voltage Moderate
- Faulty fan clutch relay stuck closed Moderate
- PCM output circuit shorted Low
Step-by-Step Diagnostic Procedure
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Check the fan clutch relay for sticking. Remove it and see if the fan stops running at high speed.
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Inspect the wiring to the fan clutch solenoid for shorts to battery voltage or chafing against metal.
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Measure voltage at the fan clutch connector with the engine cold and AC off. It should be near zero when not commanded.
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Test the fan clutch solenoid coil for shorts using a multimeter.
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Use a scan tool to verify the PCM is not commanding the fan high speed inappropriately.
Frequently Asked Questions
Why does the fan run at full speed all the time?
The circuit is sending continuous voltage to the fan clutch solenoid, keeping it engaged. This can be from a relay stuck closed, a wiring short, or a failed clutch assembly.
Is it harmful to drive with the fan always on?
The engine will run slightly cooler and fuel economy may decrease slightly. The main annoyance is excessive noise. The fan should be repaired to restore proper temperature management.
Can I unplug the fan clutch as a temporary fix?
You can, but the fan will then operate as a basic thermal clutch only. Monitor your temperature gauge carefully, especially in hot weather or while towing.