P0900 and related codes: automated clutch and hydraulic unit
In a gearbox where a computer works the clutch, the clutch actuator, its position sensor, the hydraulic pressure unit, its pump relay or its oil temperature sensor has a fault, or the clutch is slipping, too hot or out of its adaptation range.
SeverityHighCarrying on can cause expensive damage, so deal with it now.
Can you keep driving?Only as far as the workshopWhat does P0900 mean?
Automated manual gearboxes, sometimes called robotized or single-clutch automatics, are manual gearboxes whose clutch and gear changes are worked by actuators instead of a pedal and a lever. The clutch actuator is often hydraulic, fed by a small electric pump and an accumulator, and a position sensor tells the computer how far the clutch is open. These codes cover that clutch side: an actuator circuit fault, a position sensor that reads wrong, pressure that cannot be built or held, a clutch that slips or overheats, or an adaptation that has reached its limit because the clutch is worn.
What causes P0900?
- A worn clutch, which the computer can no longer compensate for
- A failing hydraulic pump or accumulator, or a leak in the hydraulic unit
- A clutch position sensor out of adjustment or failed
- Low or old hydraulic fluid in the actuator system
- A damaged wire or connector at the clutch actuator
What to check first for P0900
- Check the hydraulic fluid level where the system has a reservoir
- Listen for the pump running too often, or for a long time after the car is switched on
- Have the clutch wear and adaptation values read with a scan tool
- Have a clutch adaptation or bleed done with the right tool after any repair
Can you drive with P0900?
Drive only to a workshop. The car may refuse to pull away, drop into neutral or creep with the clutch slipping; avoid hills and heavy traffic, and have it towed if it will not engage a gear or the clutch smells burnt.
In states with an OBD-II emissions inspection, a car with the check engine light on fails the test until the fault is fixed.
Codes on this page
33
- P0805Clutch Position Sensor Circuit
- P0806Clutch Position Sensor Circuit Range/Performance
- P0807Clutch Position Sensor Circuit Low
- P0808Clutch Position Sensor Circuit High
- P0809Clutch Position Sensor Circuit Intermittent
- P0810Clutch Position Control Error
- P0811Excessive Clutch Slippage
- P0900Clutch Actuator Circuit/Open
- P0901Clutch Actuator Circuit Range/Performance
- P0902Clutch Actuator Circuit Low
- P0903Clutch Actuator Circuit High
- P0932Hydraulic Pressure Sensor Circuit
- P0933Hydraulic Pressure Sensor Range/Performance
- P0934Hydraulic Pressure Sensor Circuit Low
- P0935Hydraulic Pressure Sensor Circuit High
- P0936Hydraulic Pressure Sensor Circuit Intermittent
- P0937Hydraulic Oil Temperature Sensor Circuit
- P0938Hydraulic Oil Temperature Sensor Range/Performance
- P0939Hydraulic Oil Temperature Sensor Circuit Low
- P0940Hydraulic Oil Temperature Sensor Circuit High
- P0941Hydraulic Oil Temperature Sensor Circuit Intermittent
- P0942Hydraulic Pressure Unit
- P0943Hydraulic Pressure Unit Cycling Period Too Short
- P0944Hydraulic Pressure Unit Loss of Pressure
- P0945Hydraulic Pump Relay Circuit/Open
- P0946Hydraulic Pump Relay Circuit Range/Performance
- P0947Hydraulic Pump Relay Circuit Low
- P0948Hydraulic Pump Relay Circuit High
- P0949Auto Shift Manual Adaptive Learning Not Complete
- P2712Hydraulic Power Unit Leakage
- P2785Clutch Actuator Temperature Too High
- P2787Clutch Temperature Too High
- P2789Clutch Adaptive Learning at Limit
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
