P2037 Fault Code

Reductant Injection Air Pressure Sensor Circuit

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

The P2037 fault code indicates a problem with the Reductant Injection Air Pressure Sensor Circuit, which is crucial for the operation of the selective catalytic reduction (SCR) system. This sensor monitors the pressure of the reductant (diesel exhaust fluid) injection system, ensuring optimal performance and emission control in diesel engines. If the system detects an unusual pressure in the circuit, it triggers this fault code.

What are the symptoms of the P2037 code?

Common symptoms associated with the P2037 fault code may include:

• Illuminated check engine light on the dashboard
• Reduced engine power or acceleration
• Increased emissions and potential failure of emissions tests
• Unusual engine sounds or vibrations
• Possible diesel exhaust fluid leakage.

What causes the P2037 code?

Potential causes of a P2037 code include:

• Faulty reductant injection air pressure sensor
• Wiring issues, such as short circuits or open circuits in the sensor circuit
• Problems with the SCR system, including a clogged or malfunctioning injector
• ECU (Engine Control Unit) issues that may misinterpret the signals from the sensor.

How to fix P2037?

To resolve the P2037 fault code, follow these steps:

• Inspect the wiring and connectors related to the reductant injection air pressure sensor for any signs of damage or corrosion.
• Replace the faulty sensor if necessary.
• Check the SCR system for blockages or malfunctions, repairing or replacing components as needed.
• Clear the fault code using an OBD-II scanner and take the vehicle for a test drive to ensure the problem is resolved.