P28CDClutch A Pressure Sensor Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P28CD concerns the pressure sensor that tells the transmission controller how much oil pressure acts on clutch A. In pump-actuated wet DCTs there is no proportional valve to set pressure; instead Getrag places a pressure sensor downstream of the clutch pumps and closes the control loop over motor speed. P28CD is the general circuit fault, chiefly an interrupted signal, supply or ground line, so the controller receives no usable reading at all. Without feedback it cannot dose clutch torque and will normally take clutch A out of service. P28CE and P28CF describe a signal stuck at the low or high end, P28D0 a value that is in range but wrong. No manufacturer publicly documents P28CD.
- What you may notice
- Clutch A shut off, half of the gears unavailable
- Transmission warning lamp and stored code
- Likely causes
- LikelyOpen signal, 5-volt supply or ground wire of the clutch A pressure sensor
- PossibleSensor connector not fully latched or pin pushed out
- RareInternal open in the pressure sensor
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.