This intake air heater DTCs document is a troubleshooting manual for Fault Code 2556 on CM2250 engine applications. It explains the intake air heater 1 circuit fault, diagnostic conditions, INSITE™ checks, relay inspection, OEM harness testing, ECM calibration review, and fault clearing steps.
Official intake air heater DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2250; associated coverage also lists ISC8.3 and ISL9 CM2250, ISX11.9 CM2250, QSL9 CM2250, QSB6.7 CM2250, ISB4.5, ISB6.7, ISD4.5, and ISD6.7 CM2150 SN, ISL8.9 CM2150 SN, ISF2.8 CM2220, and ISF3.8 CM2220 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs; Engine Intake Air Heater 1 Circuit – Voltage Below Normal or Shorted to Low Source |
| Publication no. | 4022254 for ISB6.7 CM2250 in the Associated Procedures table |
| Year/Revision | Last Modified: 11-Jun-2010; troubleshooting section Last Modified: 20-Jul-2010 |
| Pages | 13 |
| File size | 0.3 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 2556
- 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 intake air heater relay and circuit.
- Guided Step 3 – Check the ECM and OEM harness.
- Guided Step 4 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins ISB6.7 CM2250 fault diagnostics and the intake air heater 1 circuit. The associated procedures table also references related Cummins engine families and bulletins, including ISC8.3 and ISL9 CM2250 with bulletin 4022257, ISX11.9 CM2250 with bulletin 2883445, QSL9 CM2250 with bulletin 4022256, and QSB6.7 CM2250 with bulletin 4022255. The extract does not name specific truck makes or vehicle models, because the relay location varies by vehicle and engine configuration. See the official Cummins website.
Who needs this intake air heater DTCs manual
Workshop technicians, diesel mechanics, and fleet repair shops use this air heater DTCs guide when an amber CHECK ENGINE lamp appears with SPN 729 FMI 4 or Fault Code 2556. It is useful for checking relay supply wiring, dirty or damaged pins, pin-to-ground shorts, pin-to-pin shorts, ECM connector condition, and ECM calibration status before replacing parts.
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