P2495 indicates that the engine control module has detected a voltage signal from the EGR cooler bypass position sensor on bank 1 that is higher than the calibrated range. This high‑circuit condition usually points to a sensor, wiring, or connector fault rather than a control‑module failure.
The sensor itself may have an internal short or open circuit causing it to output a high voltage.
Frayed insulation, pinched wires, or corrosion can create a high‑voltage condition on the signal line.
Loose pins, oxidation, or moisture in the connector can raise the measured voltage.
A stuck or mechanically binding valve can force the position sensor into a high‑voltage state.
Rare; only considered after sensor, wiring, connector, and actuator have been verified as functional.
In the vast majority of cases the PCM is not the cause; the code is usually due to the sensor, wiring, connector, or actuator. Replace the PCM only after all other possibilities have been ruled out.
Yes. A stuck or mechanically faulty valve can force the position sensor to report a high voltage, triggering the code.
Clearing the code only resets the warning light; the underlying fault will cause the code to return unless the root cause is repaired.
The vehicle may run with reduced performance and higher emissions. Extended operation can lead to further EGR system damage, so the fault should be diagnosed and repaired promptly.