Powertrain, generic · Transmission

P0776 Pressure Control Solenoid B Performance/Stuck Off

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

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

Symptoms

  • Slipping or missing gears
  • CVT: hesitation, lack of power
  • Limp mode
  • Check engine light

Repair estimate

DifficultyHardWorkshop job
Parts and labour€400–5,000
Time2–14 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

pressure control solenoidtransmission valve bodytransmission clutchestransmission control module

Related codes

P0775P0777P0778P0746P0796P0965

References: gsi.ext.gm.com, gsi.ext.gm.com, gsi.ext.gm.com, mitsubishitechinfo.com.