P2037 - Reductant Injection Air Pressure Sensor Circuit Malfunction
The P2037 code indicates a problem with the reductant injection air pressure sensor circuit, typically found in diesel vehicles with Selective Catalytic Reduction (SCR) systems. This sensor monitors the air pressure used to inject diesel exhaust fluid (DEF) into the exhaust stream. A fault in the circuit can cause improper DEF dosing, leading to increased emissions and potential damage to the SCR system.
1. Most Common Causes
- Faulty reductant injection air pressure sensor
- Open or shorted wiring in the sensor circuit
- Corroded or damaged connector
- Blown fuse or relay issue
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or limp mode
- Increased diesel exhaust fluid consumption
- Failed emissions test
3. 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 wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and ground circuits with a multimeter.
Step 4: If wiring is intact, replace the reductant injection air pressure sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can lead to reduced performance and potential damage to the SCR system. Short trips may be okay, but repair should be prompt.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.