What Does P0900 Mean?
The TCM or PCM has detected an open circuit condition in the clutch actuator circuit. This circuit controls the automated clutch in vehicles with automated manual transmissions (AMT) or dual-clutch transmissions (DCT). An open circuit means the actuator motor or solenoid is not receiving the electrical signal needed to engage or disengage the clutch, making normal clutch operation impossible.
Safety Warning
Without a functioning clutch actuator, the vehicle may be unable to shift gears, engage the clutch for starting, or disengage for stopping. The vehicle may be undriveable or may stall unexpectedly in traffic.
Common Causes
30%
Broken wire or disconnected connector in the clutch actuator circuit
30%
Failed clutch actuator motor or solenoid with open internal winding
20%
Corroded or damaged connector pins at the clutch actuator or TCM
10%
Blown fuse in the clutch actuator power supply circuit
10%
Faulty TCM unable to output the clutch actuator control signal
Diagnostic Steps
1
Check fuses related to the clutch actuator circuit and replace any that are blown; investigate the cause of the blown fuse before proceeding.
2
Locate the clutch actuator connector and inspect for damage, corrosion, water intrusion, or disconnection.
3
Measure the clutch actuator motor or solenoid resistance with an ohmmeter; compare to the manufacturer specification. An infinite reading confirms an open winding.
4
Using a wiring diagram, check continuity of each wire between the TCM connector and the clutch actuator connector; repair any open circuits found.
5
If the actuator and wiring test good, verify the TCM is outputting the control signal by backprobing the TCM connector while commanding clutch operation via scan tool.
Estimated Repair Cost
$400 - $2,000
Parts + labor, varies by vehicle and location
The TCM or PCM has detected an open circuit condition in the clutch actuator circuit. This circuit controls the automated clutch in vehicles with automated manual transmissions (AMT) or dual-clutch transmissions (DCT). An open circuit means the actuator motor or solenoid is not receiving the electri...
The most common cause of P0900 (Clutch Actuator Circuit / Open) is: Broken wire or disconnected connector in the clutch actuator circuit
Typical repair costs for P0900 range from $400 to $2,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without a functioning clutch actuator, the vehicle may be unable to shift gears, engage the clutch for starting, or disengage for stopping. The vehicle may be undriveable or may stall unexpectedly in traffic.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0900 to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
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