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P0776 – What Does It Mean and How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

Definition

P0776 is an OBD-II Code that refers to Pressure Control Solenoid B Performance

Meaning

A P0776 code is a generic diagnostic trouble code that occurs when the PCM/ECM receives a signal indicating the pressure control solenoid “B” is not functioning properly, or is stuck in the “off” position. 

It is associated with vehicles fitted with automatic transmission the P0776 is a generic code for that means the level of fluid considered necessary does not coincide with the actual amount used. 

Causes

Common causes for this code include:

  • An electronic pressure control solenoid that isn’t working
  • Internal mechanical transmission faults
  • Hydraulic blockages are affecting the internal transmission fluid pathways.
  • Transmission fluid level is low
  • The transmission fluid has impurities or has become contaminated
  • Faulty PCM (rare)

Symptoms

The symptoms of a P0776 code are:

  • Illuminated Check Engine Light 
  • Harsh, unpredictable, or delayed shifts
  • Transmission overheats
  • Gear gets stuck or slips
  • The engine stalls
  • Vehicle won’t move when in gear
  • Reduced fuel economy
  • Limp mode

Diagnosis

To diagnose a P0776 DTC code, a technician would:

  1. Scan for codes in the ECM and look at the freeze frame data for failure.
  2. Visually inspect the wiring harness and connectors for damage.
  3. Check the PCM ground, power and signal wiring.
  4. Measure the resistance of the pressure control solenoid.
  5. Test the pressure control solenoid with a scan tool.
  6. Check for blockages in the transmission fluid pathways.
  7. Check the transmission fluid level and quality.
  8. Clear the codes and road test the vehicle.

Common mistakes

The following are some of the most common mistakes that a technician may make when diagnosing a P0776 code:

  • Not thoroughly inspecting all the wiring and connectors.
  • Not checking the transmission fluid level or quality.
  • Failing to check for other codes that may be present.

How serious is this?

A P0776 code is considered a serious code and should be repaired as soon as possible as it can cause the transmission to slip or shift erratically, which can lead to further transmission damage.

What repairs can fix the code?

The following are solutions that may fix this problem:

  • Repair or replace any faulty parts such as wiring, connectors, or hoses.
  • Clean or replace the transmission fluid.
  • Flush the transmission system.
  • Clear the codes and road test the vehicle.
  • Replace the PCM (rare).

Related codes

A P0776 is related to and may be accompanied by the following codes:

P0775 – Pressure Control Solenoid B Stuck On

P0777 – Pressure Control Solenoid B Intermittent

P0778 – Pressure Control Solenoid B Low

P2714 – Transmission Fluid Temperature (TFT) Sensor Circuit High Input

Conclusion

In conclusion, the P0776 code is a diagnostic trouble code that refers to a problem with the pressure control solenoid “B”. It is usually caused by a faulty electronic pressure control solenoid, low transmission fluid level, or blockages in the transmission fluid pathways. The code can cause the transmission to shift harshly, unpredictably, or delay, and can lead to further damage if not repaired. Some possible solutions include repairing or replacing any faulty parts, cleaning or replacing the transmission fluid, and clearing the codes.