Pressure control solenoids are current-controlled proportional valves, and what B and C mean depends on the design: on GM's clutch-to-clutch automatics they are the pressure valves of clutches 2 and 3, on GM's CVT B is primary pulley pressure and C line pressure, on Jatco CVTs B is the secondary pressure valve, on Saab's AF40 B and C are clutch valves SLC1/SLC2. P0776 means the valve is electrically fine but pressure stays too low. GM's 8-speed flags gear slip of 400 rpm for 1.5 s three times, the 9-speed clutch 2 slip over 200 rpm for 3 s, the CVT primary pressure below 200 kPa for 3 s – all after one trip. Mitsubishi's Jatco CVT flags secondary pressure 1.2 MPa off target; Nissan's bulletin calls for a mechanical CVT repair, a GM 6T70 bulletin a broken wave spring. Slipping, missing gears or lack of drive and limp mode follow.
Medium severity. Can I keep driving?Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
Symptoms
- Slipping or missing gears
- CVT: hesitation, lack of power
- Limp mode
- Check engine light
Most likely causes
- Clutch, return spring or piston seal of the assigned clutch faulty
- Valve body or pressure valve dirty or worn
- CVT belt or pulley damaged (CVT)
- Fluid level low, fluid worn, filter clogged
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: hard
- It can trigger limp mode.
- It affects emissions.
What each character of P0776 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 7: Transmission
- 76: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0776?
Drive as little as possible and gently. If the transmission slips or stays in one gear, go slowly to a repair shop or call for a tow truck.
What causes code P0776?
The most common causes are: clutch, return spring or piston seal of the assigned clutch faulty; valve body or pressure valve dirty or worn; cVT belt or pulley damaged (CVT).
Related codes
- P0775Pressure Control Solenoid B
- P0777Pressure Control Solenoid B Stuck On
- P0778Pressure Control Solenoid B Electrical
- P0746Pressure Control Solenoid A Performance/Stuck Off
- P0796Pressure Control Solenoid C Performance/Stuck Off
- P0965Pressure Control Solenoid B Control Circuit Range/Performance
Sources
- gsi.ext.gm.com: 19OBDG03B Diagnostics
- gsi.ext.gm.com: 20OBDG03A Diagnostics
- gsi.ext.gm.com: 25OBDG03A
- mitsubishitechinfo.com: N5040201C0009500USA
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.