This document is a fault code 1938 DTCs troubleshooting PDF for the VGT actuator circuit on CM2150 engines. It explains the low voltage condition reported by the actuator over the J1939 datalink, then gives guided checks for batteries, OEM power harness wiring, connector pins, and fault-code clearing with INSITE™.
Official fault code 1938 DTCs document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB, ISC, and ISL with CM2150; file group lists ISB6.7 CM2150 (2007-09) |
| System/Group | DTCs; VGT Actuator Circuit |
| Publication no. | Not shown in extract |
| Year/Revision | Last Modified: 20-Jul-2010; year unknown |
| Pages | 12 |
| File size | 0.4 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- FAULT CODE 1938
- 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 equipment battery system.
- Guided Step 2 – Check the OEM power harness.
- Guided Step 3 – Clear the fault code.
Applicable truck models
The extract identifies this procedure for ISB, ISC, and ISL engines with the CM2150 control system, with the file listing ISB6.7 CM2150 (2007-09). The fault applies to the VGT actuator on the turbocharger bearing housing and concerns ECU Power Output Supply Voltage 1, where low battery voltage is detected by the VGT actuator. For brand reference, visit the official Cummins website.
Who needs this code 1938 DTCs manual
This manual is useful for diesel mechanics, fleet technicians, and workshop owners diagnosing an amber CHECK ENGINE light with SPN 3597 and FMI 1/18. It focuses on practical electrical checks: battery terminal condition, minimum battery voltage, ECM battery SUPPLY circuits, connector inspection, open circuits, shorts to ground, pin-to-pin shorts, accessory wiring faults, and final clearing of inactive fault codes.
The full PDF is available in the DiagTechPro manuals library, free account required to download.
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