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Fan Control Circuit – Shorted High
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 2377 PID: S33 SPN: 647 FMI: 3/3 LAMP: Amber SRT: |
Fan Control Circuit – shorted high. Open circuit or high voltage detected at the fan control circuit. |
The fan may stay on continuously or not run at all. |
 Fan Control Circuit
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Circuit Description
The electronic control module (ECM) provides a signal to the fan control solenoid to turn the engine fan on and off. There are two types of fans supported by this signal, variable speed, and ON/OFF. The INSITE™ electronic service tool can be used to determine which fan type is currently set up for use. The fan control circuit varies by OEM. Certain OEM’s may use a solenoid return that is wired to the ECM or may use a return that goes to engine block or chassis ground.
Component Location
The fan clutch solenoid location varies by OEM. Refer to the appropriate OEM service literature to determine the location.
Shop Talk
The ECM monitors the voltage level on this circuit. When the ECM commands the fan signal low, it expects the voltage level to be approximately 0 volts. If it detects a higher voltage, this fault is recorded. This usually indicates an open circuit or short circuit to a voltage source in the harness.
Once the fault code becomes active, the fan must be cycled to clear the code. This can be done by cycling the manual fan switch, if equipped, or by operating the engine and satisfying the fan engagement requirements.
If Fault Code 2377 is still active after completing the following troubleshooting steps, consult the OEM service literature for procedures to check the fan clutch device for an open circuit or short circuit to ground.
Refer to Troubleshooting Fault Code t05-2377
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