P0747: Pressure Control Solenoid A Stuck On

Pressure control solenoid A sets line or clutch pressure by current; most are 'normally high', so with no current – as in limp mode – maximum pressure applies. 'A' is usually the line pressure valve, on GM clutch-to-clutch transmissions (6T, 8L, 9T) the pressure valve of clutch 1. Ford does not use P0745–P0749 but P0960–P0963. P0747 means the valve is electrically fine but pressure stays applied. On GM's clutch-to-clutch units the off-going clutch 1 does not release – slip stays below 50 rpm (9-speed, 0.8 s on loaded downshifts), and Allison flags 25 rpm or less for 0.3–1 s, both after one trip. On line pressure valves it means permanently high pressure. Harsh, abrupt shifts, a tied-up transmission and a default gear follow. GM noted false settings on 2017 8-speeds: clear and retest first.

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.

Symptoms

Harsh, abrupt shifts
Transmission ties up, engine speed drops on shifts
Limp mode or default gear
Check engine light

Most likely causes

Pressure or clutch valve or spool sticking (dirt, debris)
Valve body worn
Software or false setting
Wrong or contaminated fluid
Clutch plates stuck or burnt

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
Use the scanner to command the movement and compare the actual position with the requested one.
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.
It affects emissions.

What each character of P0747 means

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

Frequently asked questions

Can I keep driving with code P0747?

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 P0747?

The most common causes are: pressure or clutch valve or spool sticking (dirt, debris); valve body worn; software or false setting.

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.