The Cummins ISM code 1962 service document is a 2-page PDF fault-code sheet that covers the VGT Actuator Driver Over Temperature fault (code 1962) on Cummins ISM CM871 engines. It sets out the SPN, FMI and warning-lamp data, a plain-language description of the VGT actuator, and the step-by-step checks a technician follows to confirm, repair and clear the fault.
Official document details
| Brand | Cummins |
| Model coverage | ISM CM871 (2007-09) / DTCs; ISX CM871 (2007-09) / DTCs |
| System / group | ISM CM871 (2007-09) / DTCs |
| Fault code | 1962 (PID S027, SPN 641, FMI 0/15) |
| Warning lamp | Amber |
| Source | TruckFaultCodes reference, Copyright © 2017 |
| Pages | 2 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Description
- Shop Talk
- Component Location
- Troubleshooting Steps
Applicable truck models
This fault-code sheet applies to Cummins ISM CM871 (2007-09) engines and, where noted in the document, the related ISX CM871 platform used in on-highway trucks fitted with the VGT actuator. Verify that the ECM calibration matches the engine before starting diagnosis. Current engine specifications and service policy are published on the Cummins official website.
Cummins ISM code 1962 troubleshooting steps
The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device and receives information via the J1939 datalink from the primary engine electronic control module (ECM). The VGT actuator performs its own diagnostics and reports failures back to the primary engine ECM using the J1939 datalink. The troubleshooting routine walks through key-on diagnostic-tool checks, inspection of the VGT actuator, and verifying that the fault goes inactive after the repair. The sheet reports fault code 1962 with SPN 641, FMI 0/15 and an amber lamp so the technician can confirm the right diagnostic tree.
Who needs this Cummins ISM code 1962 manual
Heavy-duty truck technicians and workshop owners diagnosing the VGT actuator on Cummins ISM CM871 engines need this reference. It documents the fault code 1962 conditions, likely causes and the checks required to close the repair correctly the first time.
The full PDF is available in the DiagTechPro manuals library — a free account is required to download.
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