P0746
Pressure Control Solenoid A Performance/Stuck Off
Transmission — line pressure control
Generic OBD-II
Medium
What it means
P0746 means the transmission's "A" pressure control (EPC) solenoid isn't regulating line pressure the way the control module expects — it reads as stuck off or under-performing. Line pressure sets how firmly the clutches and bands apply, so you may notice soft, slipping, or harsh shifts. It won't stop the engine from starting, but sustained slipping can wear the transmission.
Medium
Can I keep driving? Usually driveable, but soft or slipping shifts from low line pressure can wear the transmission over time — have it checked soon.
Common symptoms
What you'll notice
- Soft, delayed, or slipping shifts
- Harsh or erratic shifting under load
- Transmission may drop into limp mode (fixed gear)
- Check-engine light on
- Transmission running hotter than normal in heavy use
Common causes
Most likely first
- Stuck or failed pressure control (EPC) solenoid ALikely
- Low, dirty, or contaminated transmission fluidCommon
- Damaged wiring or corroded connector in the solenoid circuitCommon
- Valve body wear or debris holding the solenoid offLess often
- Failed transmission control module (rare)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note any other transmission codes stored with it.
- Check transmission fluid level and condition; top up or service if it is low, dirty, or smells burnt.
- Inspect the solenoid wiring and connector for damage, corrosion, or looseness.
- Measure the pressure control solenoid's resistance and command it with a scan tool; replace if out of spec.
- If the solenoid is good, inspect the valve body for wear or debris. Clear the code and road-test.
FAQ
Quick answers
Is it safe to drive with P0746?+
Short trips are usually fine, but low line pressure lets clutches slip, which overheats and wears the transmission — get it fixed before it worsens.
Can I just clear P0746?+
You can, but it returns once the solenoid or pressure fault reappears. Check the fluid and solenoid rather than only clearing it.
Related codes
Often seen with P0746
Read & clear P0746 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX