This code indicates a malfunction in the electrical circuit responsible for monitoring the air pressure within the diesel exhaust fluid injection system. The engine control module has detected voltage or signal values from the reductant injection air pressure sensor that fall outside the expected range. This can prevent proper fluid dosing and affect emissions compliance.
The sensor itself often fails internally due to heat or vibration exposure near the exhaust system.
Wires near the SCR system are exposed to high heat and road debris, leading to opens, shorts, or high resistance.
Moisture and chemical exposure can cause terminal corrosion at the sensor plug, disrupting the signal circuit.
Debris or crystallization can block the air line feeding the injector, causing abnormal pressure readings that trigger circuit codes.
The module controlling the pump and injector may malfunction, affecting sensor signal interpretation or power supply.
Internal controller failure is rare and should only be considered after all external components and wiring are verified.
Usually no, but the vehicle may enter a reduced power mode after a certain number of ignition cycles to comply with emissions regulations.
No, replacing the PCM is rarely the solution; most cases are resolved by repairing wiring or replacing the pressure sensor.
Short-term driving is possible, but prolonged operation may lead to reduced performance and eventual no-start conditions due to emissions system lockdown.
Yes, improper DEF dosing can cause the engine management system to alter fuel maps, potentially reducing efficiency.