What does code P2839 mean?

Q: What does code P2839 mean?

Shift Fork B Position Circuit High. P2839 indicates that the transmission control module (TCM) has detected an abnormally high voltage on the signal circuit for shift fork B, which is used in dual-clutch or automated manual transmissions to engage or disengage a gear. The TCM expects the circuit voltage to stay within a specific range, and a high reading typically means the circuit is open, shorted to power, or the position sensor inside the transmission is faulty.

DTC codes / P28xx · Transmission / P2839

P2839Shift Fork B Position Circuit High

P2839 indicates that the transmission control module (TCM) has detected an abnormally high voltage on the signal circuit for shift fork B, which is used in dual-clutch or automated manual transmissions to engage or disengage a gear. The TCM expects the circuit voltage to stay within a specific range, and a high reading typically means the circuit is open, shorted to power, or the position sensor inside the transmission is faulty.

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.