What does code P079B mean?

Q: What does code P079B mean?

Transmission Friction Element B Slip Detected. P079B indicates that the transmission control module has detected an excessive amount of slip in friction element B, which is a clutch or band inside the transmission that engages a specific gear ratio. The computer compares input and output shaft speeds and flags the code when the expected speed reduction does not match what the sensors report, meaning the friction element is not holding as it should.

DTC codes / P07xx · Transmission / P079B

P079BTransmission Friction Element B Slip Detected

P079B indicates that the transmission control module has detected an excessive amount of slip in friction element B, which is a clutch or band inside the transmission that engages a specific gear ratio. The computer compares input and output shaft speeds and flags the code when the expected speed reduction does not match what the sensors report, meaning the friction element is not holding as it should.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

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.