What does code P2543 mean?

Q: What does code P2543 mean?

Low Pressure Fuel System Sensor Circuit Intermittent. P2543 indicates that the powertrain control module (PCM) has detected an intermittent fault in the electrical circuit of the low-pressure fuel system sensor, which monitors fuel pressure before the high-pressure pump on direct-injection engines. The PCM sets this code when the sensor signal momentarily drops out or becomes erratic, often due to a loose connection or chafed wire, rather than a hard failure.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P2543

P2543Low Pressure Fuel System Sensor Circuit Intermittent

P2543 indicates that the powertrain control module (PCM) has detected an intermittent fault in the electrical circuit of the low-pressure fuel system sensor, which monitors fuel pressure before the high-pressure pump on direct-injection engines. The PCM sets this code when the sensor signal momentarily drops out or becomes erratic, often due to a loose connection or chafed wire, rather than a hard failure.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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