Fault code lookup

PowertrainP0778

Caution

Severity: Caution - get it checked when you can

Pressure Control Solenoid B Electrical

39 brands affected · Generic SAE J2012 description.

Key terms: SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions

1What it means in plain English

This range normally covers the transmission control system, but some manufacturers use P07-P09 codes for unrelated functions (fuel pump control, air-mix motors, lighting or windows). Check the description before assuming it is a transmission fault.

2Common causes

  1. Low or dirty transmission fluid
  2. Faulty shift solenoid
  3. Faulty speed sensor
  4. Wiring or connector fault
  5. Internal transmission wear

3Can I drive?

Caution · drive with care

If the transmission slips, jerks, will not shift, or a transmission temperature warning is on, stop driving and let it cool: continuing can cause expensive damage. If the code names a different system (for example the fuel pump), treat it on its own terms; a fuel-pump control failure can stall the car, so have it checked before driving further. Otherwise drive gently to a workshop.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 39

BrandCodeDescriptionSystem
Ashok Leyland CVP0778Pressure Control Solenoid B Electrical SAEPowertrain
BAIC MotorP0778Linear feedback current Stick BrandPowertrain
Mercedes-BenzP0778Pressure Control Solenoid B Electrical SAEPowertrain
BMWP0778Open circuit BrandPowertrain
BYDP0778Pressure Control Solenoid B Electrical BrandPowertrain
CheryP0778Pressure Control Solenoid B Electrical BrandPowertrain
ChryslerP0778Solenoid supply voltage BrandPowertrain
DaewooP0778Pressure Control Solenoid B Electrical BrandPowertrain
DaihatsuP0778SL2 solenoid system BrandPowertrain
DFFSP0778PC solenoid B failure BrandPowertrain
DFFXP0778Pressure Control Solenoid B Electrical BrandPowertrain
DFXKP0778Pressure Control Solenoid B Electrical BrandPowertrain
EOBDP0778Druckregelventil B elektrisch BrandPowertrain
FordP0778Pressure Control Solenoid B Electrical SAEPowertrain
GeelyP0778Pressure Control Solenoid B Electrical BrandPowertrain
GMP0778Pressure Control Solenoid B Electrical BrandPowertrain
Great WallP0778Pressure Control Solenoid B Electrical BrandPowertrain
HafeiP0778Pressure Control Solenoid B Electrical BrandPowertrain
HoldenP0778Pressure Control Solenoid Valve 2 Control Circuit BrandPowertrain
HondaP0778Pressure Control Solenoid B Electrical SAEPowertrain
HyundaiP0778Pressure Control Solenoid B Electrical SAEPowertrain
IsuzuP0778Pressure Control Solenoid B Electrical SAEPowertrain
Land RoverP0778Pressure Control Solenoid B Electrical SAEPowertrain
MaseratiP0778Pressure Control Solenoid B Electrical SAEPowertrain
MazdaP0778Pressure Control Solenoid B Electrical SAEPowertrain
MitsubishiP0778Secondary pressure SOL. circuit BrandPowertrain
NissanP0778Pressure Control Solenoid B Electrical SAEPowertrain
OpelP0778Pressure Control Solenoid B Electrical BrandPowertrain
PeroduaP0778SL2 solenoid system BrandPowertrain
PeugeotP0778Pressure Control Solenoid B Electrical SAEPowertrain
PorscheP0778Regelmagnetventil BrandPowertrain
ProtonP0778Secondary pressure SOL. circuit BrandPowertrain
SaabP0778Pressure Control Solenoid B Electrical BrandPowertrain
MG (SAIC)P0778Linear feedback current Stuck BrandPowertrain
SprinterP0778Pressure Control Solenoid B Electrical SAEPowertrain
SubaruP0778AT 2-4 Brake Pressure Solenoid Valve Circuit Malfunction BrandPowertrain
SuzukiP0778Pressure Control Solenoid 'B' Electrical BrandPowertrain
TataP0778Pressure Adjuster On Rail BrandPowertrain
ToyotaP0778PC solenoid B failure BrandPowertrain

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Extended variant codes 6

These 7-character codes are manufacturer-specific variants of P0778 and may be reported by some scan tools.

BrandCodeDescriptionSystem
Mercedes-BenzP077800solenoid error clutch even electrical BrandPowertrain
SsangYongP077800Transmission malfunction: transmission pressure BrandPowertrain
Mercedes-BenzP077811Ventil B08 Kurzschluss nach Masse - circuit short to ground BrandPowertrain
Mercedes-BenzP077812Ventil B08 Kurzschluss nach Plus - circuit short to battery BrandPowertrain
Mercedes-BenzP077818No description available Powertrain
Mercedes-BenzP077819Clutch valve has an electrical fault. Circuit current above threshold. - circuit current above threshold BrandPowertrain

6Related codes

  • P0770 Shift Solenoid E
  • P0771 Shift Solenoid E Performance or Stuck Off
  • P0772 Shift Solenoid E Stuck On
  • P0773 Shift Solenoid E Electrical
  • P0774 Shift Solenoid E Intermittent
  • P0775 Pressure Control Solenoid B
  • P0776 Pressure Control Solenoid B Performance/Stuck Off
  • P0777 Pressure Control Solenoid B Stuck On
  • P0779 Pressure Control Solenoid B Intermittent
  • P077A Output Speed Sensor Circuit - Loss of Direction Signal
  • P077B Output Speed Sensor Circuit - Direction Error
  • P077C Output Shaft Speed Sensor Circuit Low

Browse Pxxx codes or P077xx codes.

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