P2721
Pressure Control Solenoid D Control Circuit High
Automatic transmission
Generic OBD-II
Medium
What it means
P2721 means the transmission controller detected high voltage (usually an open circuit) in the control circuit for pressure control solenoid D. This solenoid regulates hydraulic pressure for shifting, so a fault typically causes harsh or incorrect shifts and can force the transmission into a protective limp mode. It is an electrical circuit fault and does not affect starting the engine.
Medium
Can I keep driving? Drivable, but shifts may be harsh or the transmission may drop into limp mode until the circuit is repaired.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh, delayed, or incorrect shifts
- Transmission stuck in one gear (limp mode)
- Slipping or flaring during gear changes
Common causes
Most likely first
- Open circuit or high resistance in the solenoid D control wiringLikely
- Failed pressure control solenoid DCommon
- Corroded or loose connector at the transmission or TCMCommon
- Damaged internal transmission harnessLess often
- Faulty TCM/PCM driver (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check for companion pressure-control-solenoid codes.
- Check transmission fluid level and condition.
- Inspect the solenoid connector and internal harness for opens or corrosion.
- Measure the solenoid resistance and confirm supply and ground.
- Replace the solenoid if it fails electrically; otherwise repair the wiring. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2721?+
Short trips are usually okay, but the transmission may shift harshly or lock into limp mode to protect itself. Have it repaired before extended driving.
Can I just clear P2721?+
It will return until the solenoid or its circuit is repaired. Clearing does not restore proper line-pressure control.
Related codes
Often seen with P2721
Read & clear P2721 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