P27DD: Pressure Control Solenoid T Control Circuit/Open

The TCM detects an open circuit in the control wiring of pressure control solenoid T. No current flows when the solenoid is commanded.

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

Open in solenoid control wire
Open solenoid coil
Pin pushed back out of connector body

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
Check the continuity of the wire between the component and the control module.
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
It can trigger limp mode.

What each character of P27DD means

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

Frequently asked questions

Can I keep driving with code P27DD?

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 P27DD?

The most common causes are: open in solenoid control wire; open solenoid coil; pin pushed back out of connector body.

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.