P2497 indicates the PCM has detected an electrical or rationality fault in the position-sensor circuit for the EGR cooler bypass valve on engine bank 2. The sensor reports whether the bypass valve is open or closed; a signal outside the expected range, an open circuit, or a short triggers the code and illuminates the MIL.
The sensor or its internal resistive track can wear, break, or drift out of calibration, sending an implausible voltage to the PCM.
Opens, shorts to ground or power, corroded pins, or chafed harnesses between the sensor and PCM disrupt the reference voltage, signal, or ground.
Carbon buildup or mechanical binding can prevent the valve from reaching the commanded position, causing a mismatch with the sensor feedback.
If the actuator cannot move the valve, the actual position will not match the commanded position and the PCM may log a circuit or performance fault.
Rarely, an internal PCM issue misinterprets a good sensor signal; it should only be considered after the sensor, wiring, and valve are ruled out.
Usually yes for short trips, but emissions compliance is compromised and the Check Engine Light will remain on; have it diagnosed soon.
No. PCM failure is uncommon for this code; most fixes involve the sensor, wiring, or bypass valve. Replace the PCM only after circuit and component tests rule everything else out.
Bank 2 is the engine bank opposite cylinder 1 on V-type engines; consult the manufacturer’s cylinder numbering if you are unsure.