P0798
Pressure Control Solenoid C Electrical
Transmission — line pressure
Generic OBD-II
Medium
What it means
P0798 means the transmission control module detected an electrical fault in the pressure control solenoid C circuit. This solenoid regulates hydraulic pressure inside the automatic transmission, so the fault can cause slipping or poor shifting. The engine still starts and runs; the issue is electrical (wiring, connector, or the solenoid itself).
Medium
Can I keep driving? The car still drives, but slipping or poor shifts from a pressure fault can overheat the transmission — have it repaired soon.
Common symptoms
What you'll notice
- Check-engine light on
- Slipping transmission
- Harsh, delayed, or missed shifts
- Reduced fuel economy
Common causes
Most likely first
- Damaged, shorted, or open wiring in the solenoid C circuitLikely
- Poor or corroded connector at the solenoidCommon
- Failed pressure control solenoid CCommon
- Failed transmission control module (TCM) — least commonLess often
How to diagnose & fix
Work through it in order
- Confirm the code and read freeze-frame data.
- Inspect the solenoid C wiring and connector for damage or corrosion.
- Measure the solenoid resistance and check the circuit for opens or shorts.
- Replace the solenoid if it is out of spec.
- If wiring and solenoid are good, diagnose the TCM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0798?+
You can drive gently, but slipping from a pressure fault can overheat the transmission — have it repaired soon.
Can I just clear P0798?+
It returns until the electrical fault in the solenoid C circuit is repaired.
Related codes
Often seen with P0798
Read & clear P0798 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