Powertrain
Definition only
Lights the check engine lamp
P2861: Shift Fork B Actuator Circuit Low
Standardized SAE J2012 code · P28xx codes
What does P2861 mean?
The control circuit for shift fork B actuator reports a actuator circuit low condition. Fork engagement cannot be commanded reliably.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
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
- High Control wire shorted to ground
- Medium Internal short in actuator coil
- Low Connector pins corroded - high contact resistance
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2861 on the same make and model first.
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