P0746Pressure Control Solenoid A Performance/Stuck Off
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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. P0746 means the valve is electrically fine but the commanded pressure does not build. GM's clutch-to-clutch units detect it as slip: 400 rpm or more for 1.5 s (T87), or clutch 1 slip over 200 rpm for 3 s three times (9-speed), after one trip; Allison when the oncoming clutch does not apply. Mitsubishi's dual-clutch flags 500 mA current deviation. Slipping or flaring on shifts, a missed gear and limp mode follow; GM's 9-speed bulletin checks clutch plates and replaces the valve body.
- What you may notice
- Slipping or engine flare on shifts
- Gear not reached, limp mode in a fixed gear
- Check engine light or transmission warning
- Likely causes
- LikelyPressure valve or spool worn or dirty
- LikelyFluid level too low, burnt fluid, clogged filter
- PossibleClutch plates or piston seals of the affected clutch worn
- PossibleLine pressure too low (pump, main regulator)
- RareLearned values missing after repair
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €400 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.