P27CA: Pressure Control Solenoid R Stuck On

Pressure control solenoid R stays in the activated state when commanded off. Affected hydraulic circuit stays pressurised.

Most likely causes

• Solenoid spool stuck in open position
• TCM output driver stuck on
• Carbon or debris buildup preventing free movement

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the fluid level and condition according to the manufacturer
2. Use the scanner to command the movement and compare the actual position with the requested one.
3. Check the transmission connector
4. Read the data with a transmission-compatible scanner
5. Measure the solenoid valve circuit
6. Leave opening the transmission to a specialized repair shop

Good to know

• Repair difficulty: hard
• It can trigger limp mode.

What each character of P27CA means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 7: Transmission
• CA: Specific fault in that system

Frequently asked questions

Can I keep driving with code P27CA?

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 P27CA?

The most common causes are: solenoid spool stuck in open position; tCM output driver stuck on; carbon or debris buildup preventing free movement.

Related codes

• P27C2Pressure Control Solenoid P Stuck On
• P27D2Pressure Control Solenoid S Stuck On
• P27BAPressure Control Solenoid N Stuck On
• P27DAPressure Control Solenoid T Stuck On
• P2809Pressure Control Solenoid G Stuck On
• P2818Pressure Control Solenoid H Stuck On
• P2821Pressure Control Solenoid J Stuck On
• P282APressure Control Solenoid K Stuck On

Sources

• github.com: dtc database
• en.wikipedia.org: Solenoid valve
• en.wikipedia.org: Automatic transmission

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.