OBD-II code P2460 indicates that the engine control module has detected a low voltage signal from the 'B' (secondary/upstream) pressure sensor in the diesel particulate filter (DPF) system. The DPF pressure sensor measures exhaust backpressure to monitor filter loading and regeneration, and a low reading typically points to an open circuit, a failed sensor, or a fault between the sensor and the controller. This code is specific to diesel vehicles equipped with a DPF.
The differential or upstream pressure sensor itself is the most common cause; internal element failure produces a low or stuck-low voltage output.
Open circuits, broken wires, or contaminated pins in the sensor harness frequently cause low-voltage readings and are nearly as common as a bad sensor.
A leak upstream of the sensor reference port causes lower-than-expected pressure, which the ECM interprets as a low signal from sensor B.
Cracked, plugged, or disconnected hoses running to the sensor port can produce a low or erratic reading by allowing exhaust pressure to dissipate before reaching the sensor.
A plugged DPF alters backpressure relationships and can affect sensor B readings, though it more often triggers restriction-specific codes alongside P2460.
An internal controller fault or software issue is an uncommon cause and should only be considered after sensor, wiring, and exhaust are verified good.
Short-term driving is usually possible, but the vehicle may enter reduced-power mode and the DPF could become further restricted, leading to more expensive repairs. Have it diagnosed promptly.
No. While a failed sensor is the most common cause, wiring faults, sense-line problems, and exhaust leaks can all produce the same low-voltage reading. The sensor should not be replaced until those are ruled out.
Not necessarily. P2460 is a sensor circuit code, not a code that confirms DPF failure. A clogged or damaged DPF can contribute, but a proper diagnosis is required before replacing the filter.
Almost never. Replacing the PCM/ECM is an uncommon and expensive fix for this code. In the vast majority of cases the actual cause is the pressure sensor itself, its wiring, or an exhaust-related issue. The control module should only be considered after the sensor, harness, sense lines, and exhaust have all been verified.