Error code

OBD2 P0777

OBD2P0777
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Pressure Control Solenoid 'B' Stuck On.

Severity

moderateCan drive, but performance issues may occur and worsen over time.

Summary

P0777 indicates that the pressure control solenoid B in your transmission is stuck in the open position, affecting fluid pressure regulation and potentially causing gear shift issues.

Symptoms

  • Check Engine light illuminated
  • Harsh gear engagement
  • Slipping transmission
  • Transmission flares while driving
  • Burnt transmission fluid
  • Limp mode
  • Transmission won't engage drive

Common Causes

  • Lack of transmission fluid maintenance
  • Internal transmission control module short
  • Pressure control solenoid B failure
  • Dirt or obstruction in pressure control solenoid passage

Diagnosis

  1. Check for proper electrical connection to the solenoid
  2. Inspect wiring circuit for shorts or damage
  3. Test solenoid operation manually
  4. Clear blockages in solenoid passages if present

Fixes

  • Replace pressure control solenoid B

FAQ

What should I do if the Check Engine light comes on with P0777?

Diagnose and inspect the pressure control solenoid B for proper operation and blockages. If issues are found, replace the faulty part.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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