P0900

Clutch A Actuator Control Circuit/Open

Q: Is it safe to drive with P0900?

No. On an automated clutch, an open actuator circuit can leave the car unable to move or stalling in traffic, so have it repaired before driving.

Q: Can I just clear P0900?

It will clear, but an open control circuit returns immediately until the actuator or wiring is repaired.

Transmission / automated clutch Generic OBD-II High

What it means

P0900 means the transmission control module detects an open circuit in the control wiring for clutch actuator A. On automated-manual and dual-clutch transmissions this actuator engages and releases the clutch, so an open circuit can stop the car from moving or cause it to stall. The engine itself still starts, but the vehicle may be undriveable until the actuator circuit is repaired.

High

Can I keep driving? The engine starts, but an open clutch actuator can prevent the car from moving or cause stalling — have it towed or repaired before driving.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Difficulty shifting or the transmission won't engage a gear
Stalling when coming to a stop or setting off
Vehicle may not move or enters a fail-safe mode

Common causes

Most likely first

Open or damaged wiring in the clutch actuator control circuitLikely
Loose or corroded connectors at the actuatorCommon
Failed clutch actuatorCommon
Failed transmission control module (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and inspect the clutch actuator connector and wiring for an open circuit, damage, or corrosion.
Measure the actuator's control circuit for continuity and correct resistance with a multimeter.
Confirm the actuator receives its command signal and ground when a shift is requested.
Replace the clutch actuator if it is open or unresponsive with wiring confirmed good. Clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0900?+

No. On an automated clutch, an open actuator circuit can leave the car unable to move or stalling in traffic, so have it repaired before driving.

Can I just clear P0900?+

It will clear, but an open control circuit returns immediately until the actuator or wiring is repaired.

Read & clear P0900 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX