P27CD code meaning
Pressure Control Solenoid R Control Circuit/Open
Powertrain system Generic code P27xx codes Check engine light
What P27CD means
P27CD is set when the control circuit of solenoid R appears open, so the module cannot energize the valve. On GM's Corvette with dual-clutch transmission (23OBDG07, again in 24OBDG07) the part is synchronizer actuation valve 4. The test runs with the output switched off: without a coil in the circuit, nothing pulls the sense voltage up to battery level, and it remains between roughly 1.7 and 3.0 V; held for 150 ms, this stores the code as Type A. Ford's TR9070 overview uses P27CD for open load of SPV4. Since valve 4 moves rods 3 and 4 in the B-to-A direction, those shifts become impossible. Causes are mainly a pushed-out terminal, a cut lead or a burnt winding.
P27CD at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor1 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P27CD
- MIL on
- Shifts on rods 3 and 4 in B-to-A direction not possible
- Limp mode
Common causes of P27CD
- Most likelyTerminal pushed out of the connector housing
- PossibleBurnt-out winding of solenoid R
- PossibleCut or broken control lead
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid rWiring harness
What each part of P27CD means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 7 | Area: transmission. |
| CD | The exact fault in that area. |
What to do next
- Note P27CD 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 P27CD
What does P27CD mean?
P27CD means "Pressure Control Solenoid R Control Circuit/Open". P27CD is set when the control circuit of solenoid R appears open, so the module cannot energize the valve. It is a generic code, so it means the same on every make.
Is it safe to drive with P27CD?
Drive gently and only to a workshop. With P27CD the car can go into limp mode (reduced power) to protect itself.
Will P27CD fail an emissions test?
Yes, it can. P27CD 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 P27CD to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P27CD clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.