Description
Cummins 4921728 EGR differential pressure sensor (also known as Delta-P) for EGR-equipped Cummins HD on-highway engines — principally the ISX / ISX15 / QSX15 platform, with broader use across ISM, ISL, QSM, and certain ISB / QSB applications. Reads the pressure drop across the EGR cooler / venturi and reports to the ECM so the EGR valve can meter recirculated exhaust correctly. PAI 050741 is the equivalent aftermarket replacement; sensor is a 3-pin, rectangular, 2.35″ black housing with sealing O-ring.
Signs You Need a New EGR Differential Pressure Sensor
- Active or stored fault codes for EGR Delta-P sensor / circuit (e.g., SPN 411 / 412 family)
- EGR valve commanded full open or closed, with derate or check-engine light
- Excessive EGR flow / soot loading or, conversely, no measurable EGR flow
- Loss of power, poor fuel economy, or hard cold starts on EGR-equipped Cummins
- Visible soot, oil weeping, or corrosion at the sensor body and signal lines
Specifications
| Manufacturer | Cummins (PAI Industries equivalent) |
|---|---|
| Part Number | 4921728 (PAI 050741) |
| Part Type | EGR Differential Pressure Sensor (Delta-P) |
| Connector | Rectangular, 3-pin |
| Overall Length | 2.35 in |
| Color / Finish | Black |
| Includes | Sensor, mounting O-rings |
Cross References
This sensor replaces or is equivalent to the following part numbers:
- Cummins: 4921728
- PAI Industries: 050741
- Automann: 577.90533
- Interstate McBee: M-4921728
- Also known as: 3683323, 104990-1200 (1049901200)
Applications
This EGR differential pressure sensor fits the following Cummins engines:
- Cummins ISX / ISX15 (15.0L, 2007–2017 EGR-equipped)
- Cummins QSX15 (industrial / off-highway)
- Cummins ISM (10.8L EGR variants, 2003–2010)
- Cummins ISL / ISL9 (8.9L EGR variants)
- Cummins ISB / QSB and QSM industrial applications using the same Delta-P sensor
Representative vehicles using these engines include Class 8 highway tractors (Freightliner Cascadia / Columbia, Kenworth T-series, Peterbilt 379 / 389 / 386 / 387, Volvo VNL, International ProStar / 9000) and vocational chassis (refuse, mixer, dump) running EGR-equipped ISX, ISM, or ISL engines.
Verify ESM / ECM calibration and sensor harness connector before substituting — later Cummins EGR-equipped platforms (some 4984929-spec applications) use a different sensor part number.
