P0778 OBD II Trouble Code Pressure Control Solenoid B Electrical

How to easily diagnose, repair, and symptoms and causes of a P0778 code that indicates a detected electrical problem within the B pressure control solenoid.

Symptoms of P0778 OBD II Trouble Code

  • Vehicle enters limp mode
  • Transmission slips when shifting
  • Transmission overheating
  • Transmission catches in gear
  • Decreased fuel economy
  • Possibly misfire-like symptoms
  • Check Engine Light illuminated

Common Causes of P0778 OBD II Trouble Code

  • Defective Pressure Control Solenoid
  • Dirty or contaminated fluid
  • Dirty or clogged transmission filter
  • Defective Transmission Pump
  • Defective Transmission Valve Body
  • Restricted hydraulic passages
  • Corroded or damaged connector
  • Faulty or damaged wiring
  • Faulty PCM

Severity of P0778 OBD II Trouble Code

The severity of this code normally starts as moderate, but it can progress to a more severe level rapidly when not corrected in a timely manner.