DTC P0470 Exhaust Pressure Sensor Malfunction

DTC P0470 is a diagnostic trouble code that relates to an issue with the Exhaust Pressure Sensor. This sensor plays a crucial role in modern diesel engines, providing essential data to the vehicle’s engine control module (ECM) to ensure optimal performance and emissions control. Understanding the meaning of this code, its potential causes, symptoms, and the steps to diagnose and rectify the problem is vital for maintaining a diesel engine’s efficiency.

1. What Does P0470 Code Mean?

DTC P0470 signifies a malfunction in the Exhaust Pressure Sensor, sometimes referred to as the exhaust back pressure sensor. This sensor is responsible for monitoring the pressure in the exhaust system, especially in diesel engines with a turbocharger. The information it provides helps the ECM make adjustments to optimize engine performance and minimize emissions.

2. What Are the Causes of DTC P0470?

Several factors can contribute to the occurrence of DTC P0470:

  • Faulty Exhaust Pressure Sensor: The sensor itself may become faulty over time, leading to inaccurate pressure readings or sensor failure.
  • Wiring and Connector Issues: Damaged or corroded wiring, as well as poor electrical connections, can disrupt the signal between the sensor and the ECM.
  • Exhaust Blockages: Blockages or restrictions in the exhaust system can affect pressure readings, causing the sensor to trigger the code.
  • Software or ECM Problems: Occasionally, software issues or problems with the ECM itself can result in DTC P0470.

3. What Are the Symptoms of DTC P0470?

Recognizing the symptoms associated with DTC P0470 is essential for timely diagnosis. Common signs of this code may include:

  • Check Engine Light: The check engine light will illuminate to alert the driver or technician of a potential issue.
  • Reduced Engine Power: The ECM may enter a “limp mode” to protect the engine, resulting in reduced power and performance.
  • Decreased Fuel Efficiency: A malfunctioning exhaust pressure sensor can lead to decreased fuel efficiency.

4. How to Diagnose DTC P0470?

Diagnosing DTC P0470 involves a systematic approach to pinpoint the cause of the problem. Here are the steps to follow:

  • Use an OBD-II scanner to retrieve the trouble code and confirm the presence of DTC P0470.
  • Inspect the exhaust pressure sensor wiring and connectors for visible damage, corrosion, or loose connections.
  • Conduct a visual inspection of the exhaust system for any blockages or restrictions that could affect pressure readings.
  • Test the exhaust pressure sensor to ensure it is functioning correctly and providing accurate pressure readings.
  • Check for any software or ECM-related issues by performing a comprehensive diagnostic scan.

5. How to Fix DTC P0470 Problem?

Once you’ve identified the source of the problem causing DTC P0470, it’s crucial to address it effectively. Here are the steps to consider:

  • Replace the exhaust pressure sensor if it is found to be faulty, as this is often the primary cause of the code.
  • Repair or replace damaged or corroded wiring and connectors within the exhaust pressure sensor circuit to ensure a reliable signal.
  • Clear the trouble code using your OBD-II scanner to reset the check engine light after completing the necessary repairs.
  • If blockages or restrictions are found in the exhaust system, clear them to ensure proper pressure readings.
  • In the case of software or ECM-related issues, consult a professional mechanic or technician for further diagnosis and resolution.


DTC P0470, indicating a malfunction in the Exhaust Pressure Sensor, should be addressed promptly to maintain a diesel engine’s performance and emissions control. Understanding the code’s meaning, recognizing symptoms, identifying potential causes, systematic diagnosis, and effective solutions empower you to confidently address this issue. Ensuring the proper functioning of the Exhaust Pressure Sensor contributes to efficient engine operation and reduced emissions.