Voltage on the pressure control solenoid R control line is below the expected window. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Medium severity. Can I keep driving?Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
Most likely causes
- Control wire shorted to ground
- Internal short in solenoid coil
- Connector pins corroded - high contact resistance
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
What each character of P27CF means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 7: Transmission
- CF: Specific fault in that system
Frequently asked questions
Can I keep driving with code P27CF?
Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
What causes code P27CF?
The most common causes are: control wire shorted to ground; internal short in solenoid coil; connector pins corroded - high contact resistance.
Related codes
- P27C7Pressure Control Solenoid P Control Circuit Low
- P27D7Pressure Control Solenoid S Control Circuit Low
- P27BFPressure Control Solenoid N Control Circuit Low
- P27DFPressure Control Solenoid T Control Circuit Low
- P2814Pressure Control Solenoid G Control Circuit Low
- P281DPressure Control Solenoid H Control Circuit Low
- P2826Pressure Control Solenoid J Control Circuit Low
- P282FPressure Control Solenoid K Control Circuit Low
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.