What does code P2866 mean?

Q: What does code P2866 mean?

Shift Fork E Position Circuit High. P2866 indicates that the transmission control module has detected an abnormally high voltage on the electrical circuit for shift fork E, which is used in dual-clutch or automated manual transmissions to engage or disengage a gear. The computer expects the circuit voltage to stay within a specific range, and a high reading typically points to an open circuit, a short to power, or a faulty position sensor.

DTC codes / P28xx · Transmission / P2866

P2866Shift Fork E Position Circuit High

P2866 indicates that the transmission control module has detected an abnormally high voltage on the electrical circuit for shift fork E, which is used in dual-clutch or automated manual transmissions to engage or disengage a gear. The computer expects the circuit voltage to stay within a specific range, and a high reading typically points to an open circuit, a short to power, or a faulty position sensor.

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.