Cummins fault code 1898 is the Cummins VGT Actuator Controller – Out of Calibration document for the ISX11.9 CM2250 (2010-12) engine platform, a 14-page PDF that reproduces the official fault code write-up read with Cummins INSITE. The variable geometry turbocharger (VGT) is moved by a smart electric actuator on the turbocharger bearing housing that talks to the ECM over the J1939 data link and runs its own calibration span check five minutes after start-up.
Official document details
| Brand | Cummins |
| Model coverage | Cummins ISX11.9, ISX15, ISB6.7, ISC8.3 and ISL9 CM2250 (and QSB6.7 / QSL9) |
| System / group | ISX11.9 CM2250 (2010-12) / DTCs |
| Fault code | 1898 — PID S027, SPN 641, FMI 13/13 |
| Warning lamp | Amber |
| Publication reference | Cummins troubleshooting bulletin 2883445 (VGT actuator circuit); cooling system procedure 008-018 |
| Pages | 14 |
| File size | 0.2 MB |
| Format | |
| Language | English |
What Cummins fault code 1898 means
It sets when the internal position reference is not detected during the ECM commanded span check, so the actual VGT position is unknown, often from mechanical binding. VGT actuation is disabled and intake manifold pressure drops with the VGT held in the open position. The document walks a technician through the summary and the guided troubleshooting steps needed to confirm and clear the code.
Document 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 and guided troubleshooting steps
Applicable truck models
This troubleshooting document covers Cummins ISX11.9, ISX15, ISB6.7, ISC8.3 and ISL9 CM2250 (and QSB6.7 / QSL9) engines in Class 6 to 8 trucks. It is filed under the ISX11.9 CM2250 (2010-12) / DTCs group and also applies to ISX12 CM2250 installations, so confirm the engine dataplate before ordering parts. Cross-reference the calibration revision with Cummins official engine support before clearing the code.
Who needs this Cummins fault code 1898 manual
Heavy-duty diesel technicians, fleet maintenance teams and workshop owners diagnosing a VGT actuator calibration failure use this reference to read SPN 641 / FMI 13/13 correctly and to follow the guided steps in INSITE. The possible causes it lists include:
- gear misalignment between the actuator and turbocharger housing
- foreign material preventing the sliding nozzle from moving
- a mechanical binding condition in the VGT
The full 14-page PDF for VGT actuator fault code 1898 is available in the DiagTechPro manuals library; a free account is required to download.
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