P27C0 code meaning
Pressure Control Solenoid N Control Circuit High
Powertrain system Generic code P27xx codes Check engine light
What P27C0 means
P27C0 reports too high a voltage on the control line of solenoid N, usually a short to battery or to a neighbouring output. On the Corvette with GM's dual-clutch gearbox (table 23OBDG07, 2023), synchronizer actuation valve 2 is flagged when the sense voltage stays above roughly 0.7 to 1.1 V, depending on supply voltage, while the low-side switch is on, or when actual current misses the target by over 70 % for 60 ms or by over 400 mA for 300 ms. A separate test at shutdown energizes the outputs one by one to find two lines shorted together, stores the result and sets P27C0 at the next start. All are Type A; 24OBDG07 keeps the code. Ford's TR9070 list names it shorted load on SPV2.
P27C0 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 P27C0
- MIL on
- Shift rod cannot be actuated; gears missing
- Code returns at every start after a shutdown test
Common causes of P27C0
- Most likelyControl wire shorted to a supply voltage
- PossibleTwo solenoid lines shorted together in the harness or connector
- PossiblePartially shorted solenoid coil drawing wrong current
- Less likelyDamaged output stage in the TCM
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid nWiring harness
What each part of P27C0 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. |
| C0 | The exact fault in that area. |
What to do next
- Note P27C0 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 P27C0
What does P27C0 mean?
P27C0 means "Pressure Control Solenoid N Control Circuit High". P27C0 reports too high a voltage on the control line of solenoid N, usually a short to battery or to a neighbouring output. It is a generic code, so it means the same on every make.
Is it safe to drive with P27C0?
Drive gently and only to a workshop. With P27C0 the car can go into limp mode (reduced power) to protect itself.
Will P27C0 fail an emissions test?
Yes, it can. P27C0 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 P27C0 to fix?
Difficulty: medium. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P27C0 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.