FixVault

DTC P0778:00: Notes

DTC P0778:00 Pressure control solenoid B electrical malfunction
DETECTION CONDITION 
  • After engine is started, pressure control solenoid B voltage is 0 V or does not change from B+

    Diagnostic support note 

  • The check engine light illuminates if the TCM detects the above malfunction condition during the first drive cycle.
  • The automatic transaxle warning light illuminates if the TCM detects the above malfunction condition during the first drive cycle.
  • PENDING CODE is available.
  • FREEZE FRAME DATA is available.
  • The DTC is stored in the TCM memory.
FAIL-SAFE FUNCTION 
  • Inhibits feedback control
POSSIBLE CAUSE 
  • Coupler component connector or terminal malfunction
  • Short to power supply in wiring harness between pressure control solenoid B terminal B and TCM terminal AM
  • Short to GND in wiring harness between pressure control solenoid B terminal B and TCM terminal AM
  • Pressure control solenoid B malfunction
  • TCM connector or terminal malfunction
  • Open circuit in wiring harness between pressure control solenoid B terminal B and TCM terminal AM
  • TCM malfunction
G08150727Courtesy of MAZDA MOTORS CORP.