Cummins fault code 2771 is the Cummins ISX11.9 CM2250 troubleshooting document for Aftertreatment Outlet NOx Sensor – Abnormal Update Rate (SPN 3226, FMI 9). This 20-page factory guide explains the circuit, the conditions that set the code, and the guided repair steps used with the INSITE electronic service tool. The aftertreatment outlet NOx (nitrogen oxides) sensor is a smart device that communicates with the engine electronic control module (ECM) via the J1939 data link.
Official document details
| Brand | Cummins |
| Model coverage | ISX11.9 CM2250/ISB6.7 CM2250/ISC8.3 and ISL9 CM2250/ISX15 CM2250 |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 2771 |
| SPN / FMI | 3226 / 9 |
| Warning lamp | Amber |
| Bulletin number | 2883445 |
| Revision | Last modified 21-Dec-2010 |
| Pages | 20 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Cummins fault code 2771 table of contents
- Overview and circuit description
- 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
Applicable truck models
This troubleshooting procedure applies to Cummins ISX11.9 CM2250/ISB6.7 CM2250/ISC8.3 and ISL9 CM2250/ISX15 CM2250 engines. The Aftertreatment Outlet NOx Sensor location can vary, depending on engine application. It is usually located in the exhaust system at the outlet of. The document states the code is set when this fault code is triggered when the internal ecm loses j1939 communications with the aftertreatment outlet nox sensor. When the code is active, the amber warning lamp is illuminated when this diagnostic runs and fails. Full specifications and procedure references are published by Cummins on the Cummins official website.
Who needs this Cummins fault code 2771 manual
Diesel technicians and workshop owners diagnosing Abnormal Update Rate on ISX11.9 CM2250 engines need this reference. Possible causes documented in the Shop Talk section include the aftertreatment outlet nox sensor is not receiving power, circuit in the oem harness. this can be caused, wire, blown nox sensor fuse, or low voltage supplied, open return circuit on the aftertreatment outlet nox sensor. The guide walks through each guided step and the INSITE electronic service tool tests required to validate the repair and clear the code.
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