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. P0775 is the general code for valve B. No manufacturer document available to us uses it; the trade journal MOTOR names it as a performance code of line pressure valve B on Ford's 5R55, set together with ratio codes after a broken overdrive servo. Sub-codes for performance, stuck on, electrical and intermittent follow (P0776–P0779).
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
- Harsh or slipping shifts
- Limp mode
- Check engine light
Most likely causes
- Valve body or pressure valve B worn or dirty
- Line pressure wrong (load signal, main regulator)
- Fluid condition
- Circuit or coil
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 P0775 means
- P: Powertrain: engine and transmission
- 0: Generic code: same on every make
- 7: Transmission
- 75: Specific fault in that system
Frequently asked questions
Can I keep driving with code P0775?
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 P0775?
The most common causes are: valve body or pressure valve B worn or dirty; line pressure wrong (load signal, main regulator); fluid condition.
Related codes
- P0776Pressure Control Solenoid B Performance/Stuck Off
- P0777Pressure Control Solenoid B Stuck On
- P0778Pressure Control Solenoid B Electrical
- P0779Pressure Control Solenoid B Intermittent
- P0745Pressure Control Solenoid A
- P0965Pressure Control Solenoid B Control Circuit Range/Performance
Sources
- motor.com: Transmission DTCs June 2012
- gsi.ext.gm.com: 19OBDG03B Diagnostics
- law.cornell.edu: 13 CCR 1968.2
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.