P28CD code meaning
Clutch A Pressure Sensor Circuit/Open
Powertrain system Generic code P28xx codes Check engine light
What P28CD means
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.
P28CD at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P28CD
- Clutch A shut off, half of the gears unavailable
- Transmission warning lamp and stored code
Common causes of P28CD
- Most likelyOpen signal, 5-volt supply or ground wire of the clutch A pressure sensor
- PossibleSensor connector not fully latched or pin pushed out
- Less likelyInternal open in the pressure sensor
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Clutch pressure sensor aWiring harnessTCM
What each part of P28CD means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 8 | Area: transmission. |
| CD | The exact fault in that area. |
What to do next
- Note P28CD and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P28CD
What does P28CD mean?
P28CD means "Clutch A Pressure Sensor Circuit/Open". P28CD concerns the pressure sensor that tells the transmission controller how much oil pressure acts on clutch A. It is a generic code, so it means the same on every make.
Is it safe to drive with P28CD?
Drive gently and only to a workshop. With P28CD the car can go into limp mode (reduced power) to protect itself.
Will P28CD fail an emissions test?
Yes, it can. P28CD is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P28CD to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P28CD clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.