P2453 indicates that the powertrain control module (PCM) has detected the diesel particulate filter (DPF) pressure sensor signal is outside its expected operating range or is not performing as designed. The code is set when the sensor voltage, frequency, or circuit behavior does not match the manufacturer’s specifications under normal engine operation. This can affect DPF regeneration strategies and overall engine performance.
The sensor itself can drift, fail electrically, or become contaminated, producing an out‑of‑range signal to the PCM.
Corroded, broken, or pinched wires, as well as loose or damaged connectors, can disrupt the sensor’s signal or reference voltages.
Leaks in the intake or exhaust piping that the sensor monitors can cause pressure readings that do not reflect actual filter conditions.
An excessively plugged filter creates abnormal pressure drops that the sensor may report as out‑of‑range performance.
A malfunctioning engine computer can misinterpret sensor data, but this is seldom the root cause and should be investigated only after all other possibilities are ruled out.
You can usually drive short distances, but the vehicle may be in a reduced‑power mode and the DPF may not regenerate properly. It’s advisable to diagnose and repair the issue promptly to avoid further damage.
While a faulty PCM is theoretically capable of setting this code, it is rarely the cause. Most cases are resolved by addressing the sensor, wiring, or exhaust system. Replacing the PCM without confirming other issues is usually unnecessary and costly.
Clearing the code only erases the stored fault; the underlying issue remains. The check‑engine light will likely return if the malfunction persists.
Not necessarily. The DPF may be fine; the fault often stems from the pressure sensor or its circuit. Proper pressure testing should be performed before deciding on filter replacement.