P2462 indicates an intermittent or erratic signal from the pressure sensor B circuit of the diesel particulate filter (DPF). The PCM detects irregular voltage or resistance readings that suggest a wiring or sensor fault.
The sensor itself may have internal damage or contamination causing unstable voltage output.
Corrosion, cracked insulation, or loose pins can create intermittent signals to the PCM.
High soot levels can affect pressure differentials and cause erratic sensor readings.
Rarely, the PCM’s sensor input driver can fail, but this is less common than sensor or wiring issues.
In most cases it will not. The PCM is rarely the source of an intermittent pressure sensor signal; sensor or wiring problems are far more common.
If excessive soot is causing abnormal pressure readings, a proper DPF regeneration or professional cleaning can help, but the sensor and wiring should still be inspected.
No. Because the fault is intermittent, the code may appear only under certain load or temperature conditions and may not trigger continuously.
It indicates that the sensor signal is unstable—fluctuating between normal and abnormal values—rather than a steady failure.