P2041 – Reductant Injection Air Pressure Sensor A Circuit Intermittent

The ODBII code P2041 indicates an intermittent issue with the air pressure sensor circuit for the reductant injection system, which is responsible for measuring the pressure of the reductant (urea) used in diesel engines for emissions control.

The severity of ODBII code P2041 is typically considered moderate to severe.

Common Causes For: P2040 Reductant Injection Air Pressure Sensor “A” Circuit High

• Faulty reductant injection air pressure sensor
• Wiring issues (shorts, opens, or corrosion)
• Poor electrical connections
• Faulty engine control module (ECM)
• Blocked or restricted exhaust system
• Vacuum leaks in the reductant system
• Faulty reductant pump
• Contaminated reductant fluid

Common misdiagnosis for P2041 Reductant Injection Air Pressure Sensor “A” Circuit Intermittent

• Faulty reductant injection air pressure sensor
• Wiring issues or short circuits in the sensor circuit
• Faulty engine control module (ECM)
• Issues with the reductant system, such as clogged lines or injectors
• Vacuum leaks in the intake system
• Problems with the exhaust aftertreatment system
• Incorrectly installed or damaged exhaust gas recirculation (EGR) system
• Faulty fuel pressure regulator
• Issues with the diesel exhaust fluid (DEF) quality or level
• Problems with the turbocharger or boost pressure sensor

Common Troubleshooting Steps

The OBD-II code P2041 refers to an issue with the reductant injection air pressure sensor “A” circuit, indicating that there is an intermittent problem with the sensor or its circuit. This code is often associated with diesel engines that use selective catalytic reduction (SCR) systems to reduce emissions. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues present.
• Inspect the Wiring and Connectors: Visually inspect the wiring and connectors associated with the reductant injection air pressure sensor. Look for:
• Damaged, frayed, or corroded wires.
• Loose or corroded connectors.
• Signs of wear or exposure to heat or chemicals.
• Test the Sensor: Use a multimeter to test the resistance and voltage output of the reductant injection air pressure sensor. Compare the readings to the manufacturer’s specifications.
• If the sensor is out of spec, it may need to be replaced.
• Check for Vacuum Leaks: Inspect the intake and exhaust systems for any vacuum leaks that could affect the sensor’s readings. Use a smoke machine or other methods to identify leaks.
• Inspect the Reductant System: Check the entire reductant injection system, including the pump, injector, and lines, for any blockages or malfunctions that could affect pressure readings.
• Test the Power and Ground: Ensure that the sensor is receiving the correct voltage and has a good ground connection. Use a multimeter to check for proper voltage at the sensor connector.
• Check for Software Updates: Sometimes, manufacturers release software updates that can resolve intermittent issues. Check if there are any updates available for the vehicle’s engine control module (ECM).
• Clear Codes and Test Drive: After performing any repairs or adjustments, clear the trouble codes and take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the P2041 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues.
• Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle and its emissions system. By following these troubleshooting steps, you can systematically identify and resolve the issue related to the P2041 code.