P0747 code meaning
Pressure Control Solenoid A Stuck On
Powertrain system Generic code P07xx codes Check engine light
What P0747 means
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.
P0747 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor2 to 10 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0747
- Harsh, abrupt shifts
- Transmission ties up, engine speed drops on shifts
- Limp mode or default gear
- Check engine light
Common causes of P0747
- Most likelyPressure or clutch valve or spool sticking (dirt, debris)
- PossibleValve body worn
- PossibleSoftware or false setting
- PossibleWrong or contaminated fluid
- Less likelyClutch plates stuck or burnt
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pressure control solenoid aTransmission valve bodyTransmission wiringTransmission control module
What each part of P0747 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7 | Area: transmission. |
| 47 | The exact fault in that area. |
What to do next
- Note P0747 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0747
What does P0747 mean?
P0747 means "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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0747?
Drive gently and only to a workshop. With P0747 the car can go into limp mode (reduced power) to protect itself.
Will P0747 fail an emissions test?
Yes, it can. P0747 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0747 to fix?
Difficulty: hard. A typical repair takes 2 to 10 hours of work. This is a job for a workshop.
Will P0747 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.