Cummins Exhaust Gas Pressure Sensor

The Cummins exhaust gas pressure sensor (also called Exhaust Back Pressure or EGP/EBP sensor) measures exhaust manifold pressure to help the ECM control turbocharger VGT actuators, DPF regeneration, and engine protection. Common in Cummins engines like the ISX15, 6.7L (Dodge Ram), and ISB/ISL series, it prevents overboost, monitors aftertreatment health, and triggers derates if faulty.

This guide covers location, function, common fault codes, symptoms, replacement, and tips for Cummins owners.

Key Part Numbers

– 4928594 — Most common for ISX, ISM, ISC, ISB 6.7L (2007.5–2020 Dodge Ram, heavy-duty trucks).
– 4326849 — For some ISF/QSF 2.8L/3.8L engines.
– Cross-references: 4087989, 4921746, 4903479 (often interchangeable).
Price: $50–$200 (OEM Cummins ~$150; aftermarket $50–$100).

Location of the Cummins Exhaust Gas Pressure Sensor

Location varies by engine:
– ISX/ISX15 (e.g., CM871, CM2250): Above the front section of the exhaust manifold (driver’s side), connected via a small metal tube to the manifold or turbo housing.
– 6.7L Cummins (2007.5–2024 Dodge Ram): Near the EGR cooler or exhaust manifold, with a tube running to the manifold.
– ISL/ISC 8.3L/9.0L: On the exhaust manifold or near the turbo.
Tip: Look for a small sensor with a 3-pin connector and metal tube—often soot-covered.

Function of the Exhaust Gas Pressure Sensor

The sensor: – Measures pre-turbo exhaust back pressure. – Sends voltage signal (0.5–4.5V) to ECM. – Helps control VGT vanes for boost. – Monitors DPF loading for regeneration. – Detects restrictions (clogged DPF, exhaust leaks). Normal readings: – Idle: ~5–15 inHg (or 1–5 psi). – Load: Up to 40–60 inHg (varies by engine/boost). If faulty, ECM may derate power or disable exhaust brake.

Common Fault Codes for Exhaust Gas Pressure Sensor

Fault Code	Description	Possible Causes
2374	Exhaust Gas Pressure Sensor Circuit – Voltage Above Normal	Open/short in wiring, bad sensor
2554	Exhaust Gas Pressure – Data Erratic	Soot-clogged tube, faulty sensor
2764	Exhaust Gas Pressure Sensor – Data Invalid	Wiring issues, sensor failure
SPN 1209 FMI 4	Exhaust Gas Pressure – Voltage Below Normal	Short to ground
P0471	Exhaust Pressure Sensor Range/Performance	Clogged tube, sensor out of range

Other related: SPN 1209 (exhaust pressure), 3712/3714 (derate from aftertreatment issues).

Symptoms of a Bad Cummins Exhaust Gas Pressure Sensor

– Check Engine Light (CEL) with above codes. – Reduced power/derate (especially under load). – Poor fuel economy. – Erratic exhaust brake operation. – Failed DPF regeneration (soot buildup). – High EGTs or turbo lag. Often misdiagnosed as turbo or DPF failure—always check the sensor/tube first.

Common Problems & Fixes

1. Clogged Sensor Tube — Most frequent issue (soot/carbon buildup).
– Fix: Remove tube, clean with carb cleaner or wire. Replace if corroded (~$20–$50).
2. Faulty Sensor — Internal failure or corrosion.
– Fix: Replace with OEM 4928594 (~$150).
3. Wiring Issues — Chafed harness or bad connector.
– Fix: Inspect/repair wiring, clean pins.
4. Overboost/Underboost — From incorrect readings.
– Fix: Sensor replacement + ECM recalibration.
In deleted trucks, some unplug the sensor (2013+ models allow this without codes).

Replacement Guide: Cummins Exhaust Gas Pressure Sensor

Tools needed: 22mm deep socket, torque wrench, rags. 1. Locate sensor (exhaust manifold/turbo area). 2. Disconnect electrical connector. 3. Remove sensor (counterclockwise). 4. Clean mounting hole and tube. 5. Install new sensor (hand-tight + 1/4 turn; torque ~20–25 ft-lbs). 6. Reconnect wiring. 7. Clear codes with scanner (INSITE or generic OBD). 8. Test drive—monitor pressure readings. Time: 30–60 minutes. Cost: $100–$300 (part + labor).

Frequently Asked Questions (FAQ)

1. What does the Cummins exhaust gas pressure sensor do?
Monitors exhaust back pressure for turbo control, DPF regen, and engine protection.
2. Where is the sensor located on an ISX Cummins?
Above the front exhaust manifold, connected by a tube.
3. What fault codes indicate a bad sensor?
2374, 2554, 2764, SPN 1209, P0471.
4. Can I drive with a bad exhaust pressure sensor?
Possible, but expect derate, poor performance, and potential DPF issues.
5. Is the tube clog the most common problem?
Yes—soot buildup causes 70%+ of faults.
6. Do deleted trucks need the sensor?
2013+ often run fine unplugged; earlier may need a resistor or tune.

The Cummins exhaust gas pressure sensor is a small but critical part—regular cleaning (tube) and timely replacement prevent expensive derates and DPF damage. For most 6.7L/ISX engines, part #4928594 is the go-to fix.
Need help with a specific code or engine? Drop your ESN or fault codes below!