Cummins fault 338 is a 8-page diagnostic document for Cummins ISB6.7 CM2350 (2013-17) DTCs that addresses IDLE SHUTDOWN VEHICLE ACCESSORIES. It identifies the reported condition, the diagnostic context, and the checks visible in this document. Use the procedure with the correct engine application and an appropriate diagnostic tool.
Cummins fault 338 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350 (2013-17) DTCs |
| System or group | ISB6.7 CM2350 (2013-17) DTCs |
| Fault identifier | Fault Code 338 |
| Pages | 8 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Circuit description and component location
- Reason and effect of the fault
- Conditions for running and setting diagnostics
- Action taken when the code is active
- Conditions for clearing the fault code
- Troubleshooting and repair validation steps
Applicable truck models
The extract identifies Cummins ISB6.7 CM2350 (2013-17) DTCs and describes ECM communication and diagnostic checks for the stated fault. Component locations and vehicle electronic control arrangements can vary by OEM options, so use the applicable OEM information when the procedure directs it. For manufacturer product information, visit Cummins.
Diagnostic context and procedure
The document describes the condition as IDLE SHUTDOWN VEHICLE ACCESSORIES. Its stated reason is Idle Shutdown Vehicle Accessories Relay Driver Circuit – Voltage Above Normal, or Shorted to High Source. Open circuit or short to voltage detected at the idle shutdown vehicle accessory/ignition bus relay circuit.. The reported effect is Vehicle accessories or ignition bus loads controlled by the idle shutdown relay will not power up.. The procedure instructs the technician to confirm whether the code is active, compare the relevant configuration or signals where specified, and follow the listed decision points rather than assuming a single failed part.
Who needs this Cummins fault 338 manual
This Cummins fault 338 manual is useful when a technician needs the document’s fault conditions, diagnostic sequence, and clearing criteria. The closing checks include using the diagnostic tool and verifying that the fault becomes inactive after the specified repair or configuration work.
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