What does code P2491 mean?

Q: What does code P2491 mean?

EGR Cooler Bypass Control Circuit High Bank 2. P2491 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the bank 2 exhaust gas recirculation (EGR) cooler bypass valve. The circuit is expected to operate within a specific voltage range, and a high reading typically means the PCM sees an open circuit, a short to voltage, or a failed bypass valve actuator on that bank.

DTC codes / P24xx · Auxiliary emission controls / P2491

P2491EGR Cooler Bypass Control Circuit High Bank 2

P2491 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the bank 2 exhaust gas recirculation (EGR) cooler bypass valve. The circuit is expected to operate within a specific voltage range, and a high reading typically means the PCM sees an open circuit, a short to voltage, or a failed bypass valve actuator on that bank.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.