P090C: Clutch B Actuator Control Circuit Low
Quick Answer
Not safe to drive
P090C means the transmission control module found a low voltage in the control circuit of clutch actuator B. It is a generic code, and it is most often seen on dual-clutch and other semi-automatic gearboxes, where an electric actuator opens and closes each clutch. A technician forum report ties it to the Ford 6-speed DPS6 PowerShift. The code points at the actuator's circuit: the actuator, its wiring and connector, a poor ground or the control module.
- Severity
- High · Transmission
- Estimated repair cost
- From €60 to €1350+, varies by vehicle
€60 or €1350, depending on your car.
- Clean and reseat connectors, repair the main ground connection€60–€230
- Replace the transmission control module and program it€450–€1350
A scan shows whether P090C is really stored on your car, which codes sit next to it and how urgent each one is. You can do this parked, with the ignition on.
A scan needs a Bluetooth OBD2 adapter (Bluetooth LE on iPhone), about €25-60; the built-in demo runs without one. See which adapter to buy
What does P090C mean?
P090C is a transmission-related diagnostic trouble code classified as high severity.
What are the symptoms of P090C?
- Check engine light, often with a transmission warning
- Jerky or hesitant pull-away from standstill
- Shudder or harsh shifts
- Missing gears or the car refusing to select a gear
- Limp mode, with the gearbox held in one gear
- Car will not move at all in the worst cases
What causes P090C?
Clutch B actuator motor or its internal circuit faulty
: high
Damaged, corroded or loose connector or wiring at the actuator
: high
Poor main ground at the transmission control module
: medium
Faulty connector pins at the transmission control module or a faulty module
: medium
Weak 12V battery or low supply voltage to the module
: medium
Is it safe to drive with P090C?
No - address this immediately. Do not rely on the car. On a dual-clutch gearbox, a fault in one clutch actuator can mean jerky pull-away, missing gears, limp mode or a car that will not move. If it still drives, keep to a short, gentle trip to a workshop and avoid motorways and overtaking. If it will not move or will not select a gear, have it recovered.
How do you diagnose P090C?
- Read all stored codes and the freeze frame. Other P09xx clutch codes, speed sensor codes or U-codes for lost communication change the picture.
- Check the 12V battery and charging voltage first. Low supply voltage can set actuator circuit faults and costs little to rule out.
- Inspect the connector at the actuator and at the control module for corrosion, bent or pushed-back pins and moisture, then check the main ground connection at the module.
- Test the actuator circuit against the workshop wiring diagram: supply, ground and signal continuity, with the plugs disconnected.
- Use manufacturer-level software to read the actuator and clutch data and run the gearbox's own tests. A generic OBD2 reader shows the code and freeze frame but cannot read clutch position or actuator duty on most cars.
- After any actuator, clutch or module replacement, the gearbox usually needs an adaptation or relearn with manufacturer software. Ask whether it is included in the quote.
- Confirm the diagnosis before ordering parts. In one forum report of a 2016 Focus, the module and actuator motor were replaced after troubleshooting found no wiring fault, and the car came back with the same symptoms but no code.
How much does P090C cost to fix?
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Clean and reseat connectors, repair the main ground connection | €0–€30 | €60–€200 | €60–€230 | Moderate |
| Repair wiring between the actuator and the control module | €10–€60 | €80–€250 | €90–€310 | Moderate |
| Gearbox diagnosis with manufacturer software, per hour | €0–€0 | €60–€130 | €60–€130 | Professional |
| Replace a clutch actuator motor (wide range, no standard figure) | €150–€500 | €150–€400 | €300–€900 | Professional |
| Replace the transmission control module and program it | €300–€1000 | €150–€350 | €450–€1350 | Professional |
| Replace the clutch pack on a dual-clutch gearbox | €150–€350 | €350–€800 | €500–€1150 | Professional |
Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.
P090C on specific vehicles
P090C on Ford
Ford Focus (6DCT250 DPS6 dry-clutch automatic) · Ford Fiesta (6DCT250 DPS6 dry-clutch automatic)
Related diagnostic codes
Common questions about P090C
- What does P090C mean?
- P090C means clutch B actuator control circuit low: the transmission control module found a low voltage in the circuit that drives one of the gearbox's clutch actuators. It is most often reported on dual-clutch and other semi-automatic gearboxes.
- Which cars set P090C?
- It is a generic code, so any car with a gearbox that has electrically actuated clutches can set it. The best-known report is a 2016 Ford Focus with the 6-speed DPS6 dual-clutch gearbox, described in a technician forum. Confirm the meaning for your own gearbox, because the letter B is a label that differs between designs.
- Can I drive with P090C?
- Treat it as unreliable. The gearbox can shift badly, lose gears or go into limp mode, and a car that will not move is a safety risk in traffic. If it drives, keep the trip short and gentle.
- Is it the actuator or the wiring?
- Either can set it. Faulty connector pins, a poorly connected main ground and failing shifter motors are listed among the known problems of the Ford PowerShift, so connector and ground checks come before a new actuator or module.
- Will a generic OBD2 reader or phone app fix P090C?
- It can read the code and freeze frame, and clear it. It cannot read clutch position, run actuator tests or do the relearn after a repair. Those need manufacturer-level software.
- How much does it cost to fix?
- It ranges from a connector or ground repair at the low end to a control module or clutch pack at the high end. A clutch actuator has no standard figure, so the range is wide. Ask what test pointed to the part before agreeing to it.
Read our detailed guides
Sources
- diag.net diag.net/discussion/s7l15tnl67actca0yopcyqzb3b
- en.wikipedia.org en.wikipedia.org/wiki/Ford_PowerShift_transmission