P0900
PowertrainTransmission Dcthigh severityClutch Actuator Circuit/Open
What P0900 Means
The PCM detected an open in the clutch actuator control circuit. This affects automated clutch operation in dual-clutch or automated manual transmissions.
Symptoms
- No or erratic clutch engagement
- Harsh shifting or stalling
- Transmission warning light
Common Causes
- Open wiring to clutch actuator
- Faulty clutch actuator
- Corroded or loose connector
- PCM/TCM output driver fault
Diagnostic Steps
- Scan and record freeze frame data
- Inspect clutch actuator wiring and connector
- Measure actuator circuit resistance and continuity
- Test actuator and replace if faulty
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
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Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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