P0963
Pressure Control Solenoid A Control Circuit High
Transmission
Generic OBD-II
Medium
What it means
P0963 means the transmission control module sees higher-than-expected voltage in the control circuit for pressure control solenoid A — the solenoid that regulates hydraulic line pressure. It usually points to an open or high-resistance wire, a failed solenoid, or a bad connection, and often forces the transmission into a limp mode with harsh or incorrect shifts.
Medium
Can I keep driving? Usually driveable, but the transmission may drop into a limp/failsafe mode with harsh or wrong shifts — get it fixed soon to avoid slippage damage.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh, delayed, or erratic shifts
- Slipping between gears
- Transmission stuck in a limp/failsafe gear
Common causes
Most likely first
- Open or high-resistance wiring in the solenoid circuitLikely
- Failed pressure control (line-pressure) solenoid ACommon
- Loose or corroded connector at the solenoid or transmission harnessCommon
- Faulty transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and inspect the solenoid A wiring and connector for opens, chafing, or corrosion.
- Measure the solenoid resistance against spec; replace pressure control solenoid A if it is out of range.
- Clean and re-seat the transmission connector, checking for spread or backed-out pins.
- If wiring and solenoid test good, have the TCM diagnosed as the last step.
FAQ
Quick answers
Is it safe to drive with P0963?+
Short-term yes, but the transmission may be in a protective limp mode with poor shift quality. Prolonged slipping or harsh shifts can wear the clutches, so repair it promptly.
Can I just clear P0963?+
It will come back until the circuit fault is fixed, since this is an electrical control-circuit code, not a one-time glitch.
Related codes
Often seen with P0963
Read & clear P0963 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