What does code P2477 mean?

DTC codes / P24xx · Auxiliary emission controls / P2477

P2477Exhaust Gas Temperature Sensor Circuit Intermittent or Erratic Bank 2 Sensor 4

P2477 means the powertrain control module (PCM) has detected an intermittent or erratic signal from the exhaust gas temperature (EGT) sensor located after the bank 2 catalytic converter, known as sensor 4. The PCM expects a smooth, plausible voltage or resistance change as exhaust temperature rises and falls, but instead sees the signal jump, drop out, or fail rationality checks often enough to set the code.

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.