fault code 2321 DTCs is documented in this official Cummins ISX11.9 CM2250 diagnostic and troubleshooting manual. The 14-page PDF explains the Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect condition on the engine crankshaft speed/position sensor circuit, including the SPN, FMI and PID identifiers a technician reads with the Cummins INSITE electronic service tool.
fault code 2321 DTCs document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250, ISB6.7 CM2250, ISC8.3 and ISL9 CM2250, and ISX15 CM2250 |
| System / group | Engine crankshaft speed/position sensor circuit |
| Fault code | 2321 (PID P190) |
| SPN | SPN 190 |
| FMI | FMI 2/2 |
| Warning lamp | None |
| Pages | 14 |
| Revision | Last modified 28-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
- Intermittent crankshaft engine speed sensor synchronization
- An intermittent crankshaft speed/position sensor signal
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 190 / FMI 2/2 sets, the engine can misfire as control switches from the primary to the backup speed sensor, and engine power is reduced while it runs on the backup sensor. 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 2321 DTCs manual
Fleet technicians, mobile mechanics and workshop owners use this code 2321 DTCs reference to confirm the crankshaft speed/position 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 28-Dec-2010 and the SPN, FMI and PID values make it a reliable bench reference for ISX11.9 CM2250 diagnostics.
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