The Cummins fault code 3138 troubleshooting guide is the official Cummins diagnostic procedure for Engine Exhaust Gas Recirculation Outlet Pressure – Data Erratic, Intermittent or Incorrect on the ISX11.9 CM2250 engine platform. This 12-page PDF documents the circuit description, the conditions that set and clear the fault, and the guided steps a technician follows to isolate and repair it.
Official document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250/ISX15 CM2250 |
| System / Group | Engine Exhaust Gas Recirculation Orifice Pressure Circuit |
| Fault code | 3138 (SPN 5019, FMI 2) |
| Warning lamp | Amber |
| Pages | 12 |
| File size | 0.2 MB |
| Format | |
| Language | English |
| Last revised | 11-Jun-2010 |
Cummins fault code 3138 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 guided troubleshooting steps
Fault meaning and symptoms
The document defines fault code 3138 as Engine Exhaust Gas Recirculation Outlet Pressure – Data Erratic, Intermittent or Incorrect. The electronic control module (ECM) provides a 5 volt supply to the EGR orifice pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The condition is monitored on SPN 5019, FMI 2, and is annunciated with an amber CHECK ENGINE / malfunction indicator lamp. Documented causes in the Shop Talk section include a damaged egr orifice pressure sensor, high resistance in the wiring harness on the signal or return wire, plugged or restricted egr differential pressure sensor flow ports. Each fault is worked with the INSITE electronic service tool, cross-referencing associated procedures 011-066, 019-032, 019-043, 019-461, 019-361.
Applicable truck models
This procedure covers Cummins ISX11.9 CM2250/ISX15 CM2250 engines built for the 2010-12 on-highway emissions platform, so it suits Class 8 trucks and vocational chassis running these engines. Confirm the exact application and current calibration against the official Cummins website before ordering parts.
Who needs this Cummins fault code 3138 manual
Diesel technicians and workshop owners who read 3138 on the INSITE service tool use this manual to follow the factory-approved diagnostic tree instead of replacing parts by guesswork. It is equally useful for fleet maintenance staff verifying a repair before returning a truck to service.
The full PDF is available in the DiagTechPro manuals library, a free account is required to download.
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