Powertrain, generic · Transmission

P0900 Clutch A Actuator Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Watches the drive circuit of the actuator that opens and closes clutch A in an automated or dual-clutch transmission. The code sets when the module detects an open circuit, so it cannot energise the actuator. Ford documents it for the DPS6 PowerShift gearbox in the Fiesta and Focus, where each dry clutch is moved by a three-phase electric motor with hall sensors; P0900 is the open-circuit check of the clutch A motor, alongside P0902 (short to ground) and P0903 (short to power). Ford program 20B23 for some 2016-2017 Focus cars lists P0900 with a lit check engine light and erratic shifts caused by failed clutch actuator motors. P090A is the same fault on clutch B.

Likely causes

Failed clutch A actuator motor (open winding or internal fault)
Loose connector or broken wire between TCM and actuator
Faulty motor driver inside the TCM

Symptoms

  • Check engine light on
  • Erratic or missed shifts, vibration on take-off
  • Transmission in limp mode, possibly no drive

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€150–900
Time1–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

clutch a actuatorwiring harnesstcm

Related codes

P0901P0902P0903P090AP0805P0806

References: newtonnet.co.uk, static.nhtsa.gov, gearsmagazine.com, law.cornell.edu.