P0971
Pressure Control Solenoid C Control Circuit High
Transmission
Generic OBD-II
Medium
What it means
P0971 means the transmission control module detected high voltage on the "C" pressure control solenoid circuit, usually from an open or short-to-power. This solenoid helps set hydraulic pressure for shifting, so the fault typically causes harsh or delayed shifts and can trigger limp mode. The engine itself starts and runs normally.
Medium
Can I keep driving? Usually drivable, but expect harsh or delayed shifts and possible limp mode; repair soon to protect the transmission.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh or delayed shifting
- Transmission slips or fails to engage a gear
- Transmission may enter limp (fail-safe) mode
Common causes
Most likely first
- Open or shorted wiring in the pressure control solenoid C circuitLikely
- Failed pressure control solenoid CCommon
- Corroded or loose connector at the solenoidCommon
- Faulty transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check transmission fluid level and condition.
- Inspect the solenoid C wiring and connector for opens, shorts, or corrosion.
- Measure control-circuit voltage; a persistently high reading points to an open or short-to-power.
- Test the solenoid resistance and replace it if out of spec.
- If wiring and solenoid check out, have the TCM diagnosed. Clear and road-test.
FAQ
Quick answers
Is it safe to drive with P0971?+
You can usually drive short distances, but slipping or limp mode adds wear, so address it soon.
Can I just clear P0971?+
It returns as soon as the circuit reads high again; clear it only to confirm a completed repair.
Related codes
Often seen with P0971
Read & clear P0971 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