P204C Fault Code

Reductant Pressure Sensor Circuit Low

• What does that mean?
• Symptoms
• Causes
• Solutions

The P204C fault code indicates a problem with the reductant pressure sensor circuit, specifically signaling that the pressure is lower than expected. This sensor is crucial for monitoring the pressure of the reductant fluid used in diesel engines to reduce emissions. When this code is triggered, it often means that the appropriate pressure levels are not being maintained, which can lead to inefficiencies in the emission control system.

What are the symptoms of the P204C code?

Drivers may experience various symptoms associated with the P204C fault code, such as:

• Reduced engine performance, with potential power loss.
• Increased emissions, causing the vehicle to operate outside of emissions standards.
• Dashboard warning lights related to the emissions or engine control system.
• Possible failure in emissions testing due to improper reductant levels.

What causes the P204C code?

Several factors can cause the P204C code to arise, including:

• A faulty reductant pressure sensor that is unable to measure the pressure accurately.
• Damaged wiring or connectors in the sensor circuit, leading to poor electrical connections.
• Low levels of the reductant fluid (often urea) in the tank, which may result in insufficient pressure.
• Blockages or issues within the reductant pump that affect fluid flow and pressure.

How to fix P204C?

Addressing the P204C fault code typically involves the following steps:

• Inspect and replace the reductant pressure sensor if it is found to be faulty.
• Check and repair any damaged wiring or connectors associated with the sensor circuit.
• Ensure that the reductant fluid levels are adequate, refilling the tank as needed.
• Investigate and fix any issues with the reductant pump to restore proper fluid pressure.