P2816
Pressure Control Solenoid H
Transmission
Generic OBD-II
Medium
What it means
P2816 flags a fault with transmission pressure control solenoid H, which regulates hydraulic pressure for shifts and clutch apply. When it misbehaves you may notice harsh or slipping shifts, or the transmission may drop into a limp mode. Common causes are low or dirty fluid, a stuck solenoid or valve, or a wiring fault.
Medium
Can I keep driving? Usually yes but with caution — expect harsh or slipping shifts and possibly limp mode; prolonged slipping can damage the transmission, so get it checked soon.
Common symptoms
What you'll notice
- Check-engine light on
- Harsh, delayed, or slipping shifts
- Transmission stuck in one gear or in limp mode
- Reduced fuel economy from poor shift quality
Common causes
Most likely first
- Faulty pressure control solenoid HLikely
- Low or dirty transmission fluid restricting solenoid operationCommon
- Debris or varnish blocking the valve body passageCommon
- Open, shorted, or high-resistance solenoid wiring/connectorLess often
- Faulty transmission control module (less common)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and check transmission fluid level and condition first.
- Inspect the solenoid connector and harness for damage, corrosion, or loose pins.
- Measure solenoid resistance and command it with a scan tool to confirm response.
- Service or replace the valve body / pressure control solenoid if it is stuck or out of spec.
- Clear the code and road-test through all gears to confirm normal pressure and shifts.
FAQ
Quick answers
Is it safe to drive with P2816?+
Short trips may be fine, but harsh or slipping shifts can worsen and slipping damages clutches over time. Keep driving to a minimum until it is diagnosed.
Can I just clear P2816?+
It will return if the solenoid, fluid, or valve-body problem remains. Fix the underlying pressure-control fault first.
Related codes
Often seen with P2816
Read & clear P2816 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