This code indicates the engine control module is seeing a voltage signal from the diesel particulate filter (DPF) pressure sensor that is below the expected range. It typically points to a wiring, sensor, or exhaust-leak issue rather than a problem with the particulate filter itself.
The sensor itself can fail internally and output a low or stuck voltage signal. This is the most common cause for this code.
Corroded, chafed, or loose wiring, or a damaged connector, can drop the sensor signal voltage below the expected threshold.
A leak near the DPF pressure tap or related exhaust piping can alter pressure readings and cause an implausibly low signal.
The small pressure line between the exhaust and the sensor can become clogged with soot, kinked, or disconnected, affecting the reading.
A rare internal failure in the engine control module could misread the sensor voltage. This should only be considered after all other causes are ruled out.
No. This code is about the pressure sensor circuit, not the DPF itself. The filter may be fine even when this code is set.
Short distances may be possible, but continued driving can prevent DPF regeneration and lead to excessive soot accumulation. Have it diagnosed promptly.
Usually no. Drivers are sometimes told to replace the engine computer, but the actual fault is far more likely to be the sensor, wiring, pressure tubes, or an exhaust leak. The PCM should be the last component considered.
It may clear after a drive cycle if the fault is resolved, but using a scan tool to clear the code and confirm it does not return is the reliable approach.