P2037 - Reductant Injection Air Pressure Sensor Circuit
The P2037 code indicates a problem in the electrical circuit of the reductant injection air pressure sensor, which is part of the Selective Catalytic Reduction (SCR) system in diesel vehicles. This sensor monitors the air pressure used to inject diesel exhaust fluid (DEF) into the exhaust stream. A fault in this circuit can lead to improper DEF injection, affecting emissions control and potentially triggering the check engine light.
01. Most Common Causes
- Faulty reductant injection air pressure sensor
- Open or shorted wiring in the sensor circuit
- Corroded or damaged electrical connector
- Blown fuse or relay related to the SCR system
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Increased emissions or failed emissions test
- Possible DEF system warning messages on dashboard
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for related codes.
Step 2: Visually inspect the sensor and its wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and ground circuits with a multimeter.
Step 4: If necessary, replace the sensor and clear the code to see if it returns.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive short distances, but the vehicle may enter limp mode or fail emissions tests. Prolonged driving could damage the SCR system.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the sensor price and shop rates.