This Cummins fault code 1877 document is a troubleshooting PDF for the aftertreatment diesel particulate filter outlet temperature sensor circuit. It explains the circuit description, fault code logic, diagnostic conditions, guided checks, OEM harness tests, sensor replacement decision points, and INSITE™ fault-code clearing steps.
Official Cummins fault code 1877 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2150 (2007-09); extract also references ISB, ISC, and ISL with CM2150 |
| System/Group | DTCs; Aftertreatment Temperature Sensors |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 20-Jul-2010 |
| Pages | 12 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- FAULT CODE 1877
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the aftertreatment diesel particulate filter outlet temperature sensor and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4 – Clear the fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2150 (2007-09) DTC troubleshooting and references ISB, ISC, and ISL engines with CM2150 aftertreatment temperature sensors. The component covered is the aftertreatment diesel particulate filter outlet temperature sensor, also identified in the fault text as Aftertreatment Exhaust Gas Temperature 3 Circuit, with SPN 3245 and FMI 4/4. For official product and service information, visit Cummins.
Who needs this Cummins fault code 1877 manual
Workshop owners, diesel mechanics, and fleet technicians need this fault code 1877 manual when an amber CHECK ENGINE light is active and regeneration is disabled because the ECM detects low signal voltage below 0.1-VDC for more than 2 seconds. The procedure supports connector inspection, sensor circuit response checks, resistance measurements above 100k ohms, and decisions to repair the OEM Wiring Harness, replace the Aftertreatment Exhaust Gas Temperature Sensor, or request ECM replacement authorization.
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