The Exhaust Back Pressure Sensor (EBP) is a key component in diesel-powered commercial and heavy-duty vehicles equipped with emissions control systems such as Diesel Particulate Filters (DPFs) and Exhaust Gas Recirculation (EGR).
It measures the pressure within the exhaust system and communicates this data to the Engine Control Module (ECM), allowing the ECM to regulate engine operation, manage regeneration cycles, and maintain emissions compliance.
How It Works:
- The sensor detects exhaust gas pressure ahead of the DPF or within the EGR system.
- The ECM receives a voltage signal that corresponds to the exhaust pressure level.
- When back pressure rises due to soot accumulation, restricted exhaust flow, or other conditions, the ECM can trigger
DPF regeneration or adjust EGR operation. - Accurate feedback from the EBP sensor ensures proper aftertreatment performance, fuel efficiency, and engine protection.
Product Features & Benefits from Walker Products:
- Exact OE Fit: Direct replacement ensures accurate pressure readings and easy installation
- OE Replacement Quality: Matches factory calibration and performance characteristics
- Durable Construction: Built with high-temperature resistant materials for diesel environments
- Restores Emission System Efficiency: Enables precise DPF and EGR operation to prevent downtime
Symptoms of a Failing Exhaust Back Pressure Sensor:
- Reduced engine power or limp mode activation
- Sluggish acceleration or throttle lag
- Frequent or incomplete DPF regenerations
- Excessive exhaust smoke
- Check Engine Light (MIL) illuminated
Common Check Engine Light (CEL) / OBD-II Codes
In accordance with the EPA’s OBD-II standards (adopted in 1996 and later expanded to heavy-duty applications), the following Diagnostic Trouble Codes (DTCs) are commonly associated with Exhaust Back Pressure Sensors.
Use this list as a general reference only. Always consult a qualified technician and follow vehicle manufacturer and EPA guidelines for diagnostics, sensor replacement, and ECU/PCM relearn procedures.
- P0470 – Exhaust Pressure Sensor Circuit
- P0471 – Exhaust Pressure Sensor Circuit Range/Performance
- P0472 – Exhaust Pressure Sensor Circuit Low Input
- P0473 – Exhaust Pressure Sensor Circuit High Input
- P0474 – Exhaust Pressure Sensor Circuit Intermittent
- P0401 – Exhaust Gas Recirculation Flow Insufficient Detected
- P0402 – Exhaust Gas Recirculation Flow Excessive Detected
- P2452 – Diesel Particulate Filter Pressure Sensor A Circuit
- P2453 – Diesel Particulate Filter Pressure Sensor A Circuit Range/Performance
- P2454 – Diesel Particulate Filter Pressure Sensor A Circuit Low
- P2455 – Diesel Particulate Filter Pressure Sensor A Circuit High