P0974
Shift Solenoid A Control Circuit High
Transmission
Generic OBD-II
Medium
What it means
P0974 means the transmission control module has seen high voltage (a likely short to power or open) on the control circuit for shift solenoid 'A'. That solenoid helps engage the correct gear, so the fault often shows up as harsh or missed shifts, and the transmission may enter a protective limp mode. The engine itself starts and runs normally.
Medium
Can I keep driving? Usually drivable, but expect harsh or missed shifts and possible limp mode; repair soon to avoid added transmission wear.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh or erratic shifting
- Transmission slipping or holding a gear too long
- Transmission stuck in limp mode
Common causes
Most likely first
- Short to voltage in the shift solenoid 'A' control wiringLikely
- Failed shift solenoid 'A'Common
- Corroded or damaged connector at the transmissionCommon
- Chafed or pinched wiring in the solenoid circuitLess often
- Faulty transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Scan for related transmission codes and review freeze-frame data.
- Inspect the solenoid connector and harness for a short to power, corrosion, or damage; repair as needed.
- Measure shift solenoid 'A' resistance against spec and replace it if out of range.
- Check transmission fluid level and condition before condemning parts.
- If wiring and solenoid check out, have the TCM evaluated. Clear the code and road-test.
FAQ
Quick answers
Is it safe to drive with P0974?+
You can usually drive gently for short distances, but harsh shifts or limp mode strain the transmission. Fix it soon.
Can I just clear P0974?+
It will come back until the circuit fault or solenoid is repaired, because the TCM monitors this control circuit continuously.
Related codes
Often seen with P0974
Read & clear P0974 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