P0776 is a generic OBD2 code that may appear on Nissan Pathfinders equipped with an automatic transmission. This code indicates that the pressure control solenoid “B” inside your Pathfinder’s transmission has a malfunction or is stuck in the off position.
P0776 Definition: Pressure Control Solenoid “B” – Performance/Stuck
Here is the definition of P0776, divided into its two parts:
Pressure control solenoid “B”
Your Pathfinder’s automatic transmission shifts gears by changing the pressure of the transmission fluid. The transmission solenoids are responsible for facilitating this pressure change
Performance or jam
The P0776 code indicates that the pressure control solenoid is not doing its job like it is supposed to or it may be stuck. The code is most likely caused by a bad “b” pressure control solenoid, but there are MANY potential causes.
P0776 Symptoms: Nissan Pathfinder
With this code, there will be some serious streaming performance issues. These are the most common symptoms associated with P0776 in the Nissan Pathfinder:
Nissan Pathfinder: P0776 Causes + Diagnosis
Diagnosing P0776 can be a challenge at home since the pressure control solenoids are located inside the transmission. But there are some things you can check before taking it for diagnosis.
Here are the most common causes of P0776, and a solid order to check them:
Check the transmission fluid
Start by checking your Pathfinder’s transmission fluid. A low transmission fluid level can cause a drop in line pressure and cause the pressure control solenoids to malfunction.
The transmission fluid should be full and clean. If the fluid is black or shows signs of being burned, changing the fluid may be enough to eliminate P0776.
A clogged transmission filter can cause the pressure inside the transmission to drop as well.
Automatic transmission fluid has a very hard job. It has to cool, lubricate, and transfer energy. It can go a long time without being changed, but if it overheats, that may be enough to cause P0776 on your Pathfinder.
Check if the wiring harness is damaged
Check your Pathfinder’s wiring harness for damage. Make sure the wiring harness has not been damaged by road debris. If so, repair it, delete the code, and see if it appears again.
Check other codes
Check if there are other codes. In the case of transmission-related codes, they usually appear in a cascade. If you have a good scanner, try to locate them in the order they were stored in the PCM memory.
Other codes can also give you valuable information about the cause of your transmission problems.
These are some of the other causes of P0776:
- A mechanical failure within the transmission
- Clogged passage inside the transmission
- pressure control solenoid
- Bad TCM/PCM
Faulty pressure regulator
Removing P0776 usually involves replacing the “b” pressure control solenoid, which is beyond the capabilities of most Shadetree mechanics.
Several potential problems can cause P0776 on the Nissan Pathfinder. Before taking your car to a professional, check the fluid level and clarity. If it is low or bad, you may be “lucky” and that will be enough to clear the code.
A good transmission shop should be able to quickly figure out the cause of this code. Good luck!