What does code P28F9 mean?

Q: What does code P28F9 mean?

Exhaust Pressure Too Low Bank 1. P28F9 indicates that the powertrain control module has detected an exhaust pressure reading from the bank 1 sensor that is lower than the expected value for the current operating conditions. The computer compares the measured exhaust pressure against a modeled or expected pressure and sets this code when the actual pressure falls below the calibrated threshold.

DTC codes / P28xx · Transmission / P28F9

P28F9Exhaust Pressure Too Low Bank 1

P28F9 indicates that the powertrain control module has detected an exhaust pressure reading from the bank 1 sensor that is lower than the expected value for the current operating conditions. The computer compares the measured exhaust pressure against a modeled or expected pressure and sets this code when the actual pressure falls below the calibrated threshold.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

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