Cummins fault code 2398 is documented in this official Cummins ISX11.9 CM2250 diagnostic and troubleshooting manual. The 12-page PDF explains the Ambient Air Temperature – Data Erratic, Intermittent, or Incorrect condition on the ambient air temperature sensor 1 circuit, including the SPN, FMI and PID identifiers a technician reads with the Cummins INSITE electronic service tool.
Cummins fault code 2398 document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250 and ISX15 CM2250 |
| System / group | Ambient air temperature sensor 1 circuit |
| Fault code | 2398 |
| SPN | SPN 171 |
| FMI | FMI 2 |
| Warning lamp | Amber |
| Pages | 12 |
| 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
- A stuck in-range ambient air temperature sensor
- High resistance in the sensor signal or return lines
- An ECM malfunction
Applicable truck models and engines
This document applies to the ISX11.9 CM2250 and ISX15 CM2250 engine families running the CM2250 electronic control module. When SPN 171 / FMI 2 sets, the ECM estimates the ambient air temperature. Coverage and part numbers should always be verified against current service data on the Cummins official support site before ordering components.
Who needs this Cummins fault code 2398 manual
Fleet technicians, mobile mechanics and workshop owners use this fault code 2398 reference to confirm the ambient air temperature sensor 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.
The full PDF is available in the DiagTechPro manuals library; a free account is required to download it.
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