P2861
Shift Fork B Actuator Circuit Low
The control circuit for shift fork B actuator reports a actuator circuit low condition. Fork engagement cannot be commanded reliably.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- Control wire shorted to groundCommon
- Internal short in actuator coilPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Shift Fork Actuator B
- Wiring Harness
- TCM
P2861 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.