P0777: Pressure Control Solenoid ‘B’ Stuck On DTC Trouble Code

A pressure control solenoid is activated when the ECU sends an electrical charge/pulse through a coil of wire that’s wrapped around its internal plunger mechanism. A P0777 diagnostic trouble code means the computer has detected a mechanical problem with the solenoid, or there could be a blocked fluid passage.

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How Serious is the Code?

A P0777 usually means there is a mechanical problem inside the transmission or solenoid, which means you could experience lots of symptoms, including an overheated transmission, engine stalling, and a non-working transmission.

Symptoms

Symptoms of a P0777 include:

  • Check engine light
  • Erratic, delayed or harsh shifts
  • Transmission slipping
  • Engine stalls when coming to a stop
  • Transmission gets stuck in a gear
  • Vehicle won’t move when in gear
  • Lower MPG
  • Transmission overheats
  • Limp mode

Causes

  • Not enough transmission fluid
  • Dirty transmission fluid / filter
  • Damaged wiring/connector
  • Malfunctioning pressure control solenoid
  • Defective transmission pump
  • Blocked pressure passage
  • Valve body issue
  • TCM or ECU failure

How to Diagnose the Code?

When trying to diagnose a pressure control solenoid DTC, the first thing a mechanic should look at is the level and condition of the transmission fluid. If it appears dirty, burnt, or metal shavings are present, it’s possible the transmission could have serious internal damage. Regular maintenance is the easiest way to extend the life of your transmission, and not having your transmission fluid changed on time can result in catastrophic wear to internal components. It’s possible to flush the transmission and clear the blocked hydraulic passages. However, this may only be a temporary fix if damage has already been done to the valve body, clutches, torque convertor or seals.

If the transmission fluid is clean and there are no leaks, then the wiring harness and connectors should be carefully examined for signs of damage and corrosion. If no issues are found, then the pressure control solenoid should be tested directly following the manufacturers recommended test procedure. If the solenoid functions properly, then other components like the valve body, pressure regulator valve, or transmission pump, could be at fault.

Common Mistakes When Diagnosing

It’s not uncommon for many mechanics to blame the transmission pump for this DTC, when it could actually be a wiring problem, or a faulty pressure control solenoid.

What Repairs Will Fix P0777?

  • Changing the fluid and filter
  • Replace faulty pressure control solenoid
  • Repair or replace a faulty transmission pump
  • Repair or replace defective transmission valve body
  • Transmission flush to clean passages
  • Cleaning corrosion from connectors
  • Repairing or replacing wiring
  • Flashing or replacing PCM

Related Codes

P0775 – Pressure Control Solenoid ‘B’

P0776 – Pressure Control Solenoid ‘B’ Performance or Stuck Off

P0778 – Pressure Control Solenoid ‘B’ Electrical

P0779 – Pressure Control Solenoid ‘B’ Intermittent

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Full Transmission DTC Codes Table

Trouble CodeDescription
P0218Transmission Over Temperature Condition
P0700Transmission Control System (MIL Request)
P0701Transmission Control System Range/Performance
P0702Transmission Control System Electrical
P0703Torque Converter/Brake Switch B Circuit
P0704Clutch Switch In put Circuit Malfunction
P0705Transmission Range Sensor Circuit Malfunction (PRNDL Input)
P0706Transmission Range Sensor Circuit Range/Performance
P0707Transmission Range Sensor Circuit Low Input
P0708Transmission Range Sensor Circuit High Input
P0709Transmission Range Sensor Circuit intermittent
P0710Transmission Fluid Temperature Sensor Circuit
P0711Transmission Fluid Temperature Sensor Circuit Range/Performance
P0712Transmission Fluid Temperature Sensor Circuit Low Input
P0713Transmission Fluid Temperature Sensor Circuit High Input
P0714Transmission Fluid Temperature Sensor Circuit Intermittent P0715
P0715Input/Turbine Speed Sensor Circuit
P0716Input/Turbine Speed Sensor Circuit Range/Performance 
P0717Input/Turbine Speed Sensor Circuit No Signal
P0718Input/Turbine Speed Sensor Circuit Intermittent
P0719Torque Converter/Brake Switch B Circuit Low
P0720Output Speed Sensor Circuit
P0721Output Speed Sensor Circuit Range/Performance
P0722Output Speed Sensor Circuit No Signal
P0723Output Speed Sensor Circuit Intermittent
P0724 Torque Converter/Brake Switch B Circuit High
P0725Engine Speed Input Circuit
P0726Engine Speed Input Circuit Range/Performance
P0727Engine Speed Input Circuit No Signal
P0728Engine Speed Input Circuit Intermittent
P0729Gear 6 Incorrect Ratio
P0730Incorrect Gear Ratio
P0731Gear 1 Incorrect Ratio
P0732Gear 2 Incorrect Ratio
P0733Gear 3 Incorrect Ratio
P0734Gear 4 Incorrect Ratio
P0735Gear 5 Incorrect Ratio
P0736Reverse Incorrect Ratio
P0738TCM Engine Speed Output Circuit
P0739TCM Engine Speed Output Circuit Low
P0740Torque Converter Clutch Circuit Malfunction
P0741Torque Converter Clutch Circuit
P0742Torque Converter Clutch Circuit Stuck On
P0743Torque Converter Clutch Circuit Electrical
P0744Torque Converter Clutch Circuit Intermittent
P0745Pressure Control Solenoid 'A'
P0746Pressure Control Solenoid 'A' Performance or Stuck Off
P0747Pressure Control Solenoid 'A' Stuck On
P0748Pressure Control Solenoid 'A' Electrical
P0749Pressure Control Solenoid 'A' Intermittent
P0750Shift Solenoid 'A'
P0751Shift Solenoid 'A' Performance or Stuck Off
P0752Shift Solenoid 'A' Stuck On
P0753Shift Solenoid 'A' Electrical
P0754Shift Solenoid 'A' Intermittent
P0755Shift Solenoid 'B'
P0756Shift Solenoid 'B' Performance or Stuck Off
P0757Shift Solenoid 'B' Stuck On
P0758Shift Solenoid 'B' Electrical
P0759Shift Solenoid 'B' Intermittent
P0760Shift Solenoid 'C'
P0761Shift Solenoid 'C' Performance or Stuck Off
P0762Shift Solenoid 'C' Stuck On
P0763Shift Solenoid 'C' Electrical
P0764Shift Solenoid 'C' Intermittent
P0765Shift Solenoid 'D'
P0766Shift Solenoid 'D' Performance or Stuck Off
P0767Shift Solenoid 'D' Stuck On
P0768Shift Solenoid 'D' Electrical
P0769Shift Solenoid 'D' Intermittent
P0770Shift Solenoid 'E'
P0771Shift Solenoid 'E' Performance or Stuck Off
P0772Shift Solenoid 'E' Stuck On
P0773Shift Solenoid 'E' Electrical
P0774Shift Solenoid 'E' Intermittent
P0775Pressure Control Solenoid 'B'
P0776Pressure Control Solenoid 'B' Performance or Stuck Off
P0777Pressure Control Solenoid 'B' Stuck On
P0778Pressure Control Solenoid 'B' Electrical
P0779Pressure Control Solenoid 'B' Intermittent
P0780Shift Malfunction
P07811-2 Shift
P07822-3 Shift
P07833-4 Shift
P07844-5 Shift
P0785Shift/Timing Solenoid
P0786Shift/Timing Solenoid Range/Performance
P0787Shift/Timing Solenoid Low
P0788Shift/Timing Solenoid High
P0789Shift/Timing Solenoid Intermittent
P0790Normal/Performance Switch Circuit
P0791Intermediate Shaft Speed Sensor Circuit
P0792Intermediate Shaft Speed Sensor Circuit Range/Performance
P0793Intermediate Shaft Speed Sensor Circuit No Signal
P0794Intermediate Shaft Speed Sensor Circuit Intermittent
P0795Pressure Control Solenoid 'C'
P0796Pressure Control Solenoid 'C' Performance or Stuck off
P0797Pressure Control Solenoid 'C' Stuck On
P0798Pressure Control Solenoid 'C' Electrical
P0799Pressure Control Solenoid 'C' Intermittent
P0810Transmission Fluid Pressure Manual Valve Position Switch
P0811Maximum Adaptive and Long-Term Shift Times
P0812Transmission Fluid Overtemperature
P0813Torque Control Solenoid Malfunction
P0814Torque Converter Overstressed
P0816Transmission Fluid Pressure Manual Valve Position Switch Park/Neutral with Drive Ratio
P0817Transmission Fluid Pressure Manual Valve Position Switch Reverse with Drive Ratio
P0818Transmission Fluid Pressure Manual Valve Position Switch Drive without Drive Ratio
P0819Internal Mode Switch No Start/Wrong Range
P0820Internal Mode Switch Circuit ‘A’ Low
P0876Transmission Fluid Pressure Sensor/Switch D Circuit Range/Performance
P1821Internal Mode Switch Circuit ‘B’ Low
P1822Internal Mode Switch Circuit ‘B’ High
P1822Internal Mode Switch Circuit ‘B’ High
P1823Internal Mode Switch Circuit ‘P’ Low
P1824Internal Mode Switch Circuit ‘P’ High
P1825Internal Mode Switch Invalid Range
P1826Internal Mode Switch Circuit ‘C’ High
P1831Pressure Control Solenoid Power Circuit Low
P1832Pressure Control Solenoid Power Circuit High
P1833GM – TCC Solenoid Power Control Circuit Low Voltage
P1834GM – TCC Solenoid Power Control Circuit High Voltage

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Davis benoit

It pulls in park . It pulls in neutral an the codes were p0700an p0777. Just asking if I could do it my self before tackling the problem head on.. 2008 Buick enclave. What u think it could be an what to look for