What does code P2858 mean?

Q: What does code P2858 mean?

Clutch B Pressure Engagement Performance/Too Low. P2858 indicates that the transmission control module has detected a problem with the hydraulic pressure for clutch B during engagement, specifically that the pressure is too low or the engagement performance is not meeting expectations. The computer monitors pressure sensors and compares actual pressure to commanded pressure, and when the actual pressure falls short, it sets this code.

DTC codes / P28xx · Transmission / P2858

P2858Clutch B Pressure Engagement Performance/Too Low

P2858 indicates that the transmission control module has detected a problem with the hydraulic pressure for clutch B during engagement, specifically that the pressure is too low or the engagement performance is not meeting expectations. The computer monitors pressure sensors and compares actual pressure to commanded pressure, and when the actual pressure falls short, it sets this code.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

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.