fault code 2377 DTCs is documented in this official Cummins ISX11.9 CM2250 diagnostic and troubleshooting manual. The 15-page PDF explains the Fan Control Circuit – Voltage Above Normal or Shorted to High Source condition on the fan control circuit, including the SPN, FMI and PID identifiers a technician reads with the Cummins INSITE electronic service tool.
fault code 2377 DTCs document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 |
| System / group | Fan control circuit |
| Fault code | 2377 (PID S033) |
| SPN | SPN 647 |
| FMI | FMI 3/3 |
| Warning lamp | Amber |
| Pages | 15 |
| Revision | Last modified 29-Dec-2010 |
| Format | |
| Language | English |
Document table of contents
- Circuit description and component location
- Conditions for running the diagnostics
- Conditions for setting the fault code
- Action taken when the fault code is active
- Conditions for clearing the fault code
- Shop Talk and possible causes
- Associated procedures table
- Guided troubleshooting steps
Common causes and symptoms
- An open circuit in the fan control circuit
- High voltage on the fan control circuit
- A fan clutch solenoid whose location varies by OEM
Applicable truck models and engines
This document applies to the ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 engine families running the CM2250 electronic control module. When SPN 647 / FMI 3/3 sets, the cooling fan can stay on continuously or fail to run at all. Coverage and part numbers should always be verified against current service data on the Cummins official support site before ordering components.
Who needs this fault code 2377 DTCs manual
Fleet technicians, mobile mechanics and workshop owners use this code 2377 DTCs reference to confirm the fan clutch solenoid diagnosis before replacing parts, and to follow the same clearing steps Cummins publishes for INSITE. Reading the live data and freeze-frame with INSITE before any parts replacement helps avoid unnecessary repairs and repeat shop visits. The revision date of 29-Dec-2010 and the SPN, FMI and PID values make it a reliable bench reference for ISX11.9 CM2250 diagnostics.
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