P27C1: Pressure Control Solenoid P Performance/Stuck Off

Pressure control solenoid P is commanded on but does not produce the expected pressure.

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

Solenoid spool stuck in closed position
Hydraulic feed restricted by debris
Carbon or debris buildup preventing free movement

What to check, in order

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

Check the fluid level and condition according to the manufacturer
Compare the reading with other engine data while varying the engine speed.
Check the transmission connector
Read the data with a transmission-compatible scanner
Measure the solenoid valve circuit
Leave opening the transmission to a specialized repair shop

Good to know

Repair difficulty: hard

What each character of P27C1 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
7: Transmission
C1: Specific fault in that system

Frequently asked questions

Can I keep driving with code P27C1?

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 P27C1?

The most common causes are: solenoid spool stuck in closed position; hydraulic feed restricted by debris; carbon or debris buildup preventing free movement.

Related codes

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.