This code indicates that the engine computer has detected an abnormal voltage or signal from the pressure sensor that monitors the diesel particulate filter (DPF). The sensor measures the pressure difference across the DPF to determine if it is becoming clogged with soot. A circuit malfunction means the electrical wiring or the sensor itself is failing, preventing accurate soot load readings.
The sensor itself can fail internally, sending an incorrect or out-of-range voltage signal to the powertrain control module.
Corroded, chafed, or disconnected wiring and connectors in the sensor circuit can cause high resistance or an open/short circuit.
The metal tubes connecting the exhaust to the pressure sensor can become clogged with soot or moisture, causing inaccurate pressure readings.
An exhaust leak upstream or at the sensor pressure ports can alter the exhaust backpressure, leading to an implausible signal.
Internal PCM failures are extremely rare for this code and should only be considered after all wiring, sensor, and mechanical exhaust issues are eliminated.
It depends on the severity. If the vehicle has not entered limp mode, it can often be driven temporarily, but you should avoid long trips. Continued driving may prevent the DPF from regenerating, leading to severe exhaust blockage.
Not necessarily. P2452 is an electrical circuit code for the pressure sensor, meaning the computer cannot read the pressure at all. While a severely clogged filter is possible, the root cause is much more likely to be a bad sensor, damaged wiring, or blocked sensor tubes.
No, replacing the PCM is almost never the correct fix for this code. Mechanics or forums may suggest it, but the failure is almost exclusively the pressure sensor, the wiring, or clogged sensor tubes. The PCM should only be replaced as an absolute last resort.
You can carefully clean the sensor ports and the metal tubes connecting it to the exhaust, as soot accumulation here often causes issues. However, if the internal electronics of the sensor have failed, cleaning will not resolve the circuit code.