P2040 - OBD II Trouble Code

Our automotive experts have put together the following information about the P2040 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P2040 code.

What Does P2040 Code Mean?

OBD-II Code P2040 is defined as a Reductant Injection Air Pressure Sensor "A" Circuit High

Code P2040 is set when an issue is detected with the Reductant Injection Air Pressure Sensor. This sensor is part of the Reductant (DEF) System.

Common Problems That Trigger the P2040 Code

• Powertrain Control Module (PCM) failure
• Reductant air pressure sensor
• Wiring issue