P0901
Clutch A Actuator Control Circuit Range/Performance
Transmission / clutch actuator
Generic OBD-II
Medium
What it means
P0901 means the clutch 'A' actuator control circuit is not performing as expected on a vehicle with an automated-manual or clutch-by-wire transmission. The actuator engages and releases the clutch electronically; when its circuit reads out of range the transmission may shift roughly, slip, or fall back to a protective limp mode.
Medium
Can I keep driving? Engine starts, but on an automated-manual or dual-clutch transmission the car may shift harshly, hesitate, or drop into limp mode and refuse to move — repair before it strands you.
Common symptoms
What you'll notice
- Check-engine or transmission warning light on
- Difficulty or failure to shift gears
- Harsh or jerky shifting
- Clutch slipping or failing to fully engage
- Transmission enters limp mode / limited functionality
Common causes
Most likely first
- Faulty clutch actuator or its position sensorLikely
- Wiring or connector fault in the actuator control circuitCommon
- Mechanical or hydraulic problem in the clutch systemCommon
- Low system voltage, or a faulty clutch control moduleLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm battery/system voltage is within spec.
- Inspect the actuator connector and wiring for damage, corrosion, or loose pins.
- Test the actuator and its position sensor against specification.
- Check the clutch hydraulics/mechanicals; replace the actuator or module as diagnosed, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0901?+
Not reliably. The car may refuse to move or enter limp mode without warning, so repair it before depending on the vehicle.
Can I just clear P0901?+
It clears, but returns as soon as the actuator fault reappears. Fix the actuator or its circuit first.
Related codes
Often seen with P0901
Read & clear P0901 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX