Powertrain
Definition only
Lights the check engine lamp
P285B: Shift Fork A Actuator Circuit/Open
Standardized SAE J2012 code · P28xx codes
What does P285B mean?
The control circuit for shift fork A actuator reports a actuator circuit/open 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 Open in actuator control wire
- Medium Open actuator coil
- Low Pin pushed back out of connector body
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P285B on the same make and model first.
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