P2041 - Reductant Injection Air Pressure Sensor Circuit Intermittent
The P2041 code indicates an intermittent fault in the reductant injection air pressure sensor circuit, which is part of the Selective Catalytic Reduction (SCR) system. This sensor monitors air pressure used to inject diesel exhaust fluid (DEF) into the exhaust stream. An intermittent signal can cause the SCR system to malfunction, leading to increased emissions and potential derating of engine power.
01. Most Common Causes
- Faulty reductant injection air pressure sensor
- Wiring or connector issues (corrosion, loose connections, broken wires)
- Clogged or restricted air intake to the sensor
- Faulty reductant injection pump or control module
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or derating
- Increased diesel exhaust fluid consumption
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data to confirm P2041.
Step 2: Visually inspect the sensor and wiring harness for damage, corrosion, or loose connections.
Step 3: Test the sensor's voltage and ground circuits using a multimeter; compare to manufacturer specifications.
Step 4: Check for any service bulletins or recalls related to the SCR system.
Step 5: If wiring is intact, replace the reductant injection air pressure sensor and clear the code.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code, as it can lead to reduced engine power and increased emissions. You may experience derating, which limits vehicle speed and performance.
How much does it cost to fix?▼
The cost to fix P2041 typically ranges from $150 to $400, including parts and labor. The sensor itself costs $50-$150, and labor adds $100-$250 depending on the vehicle and shop rates.