P0778 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0778 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0778 code.

What Does P0778 Code Mean?

OBD-II Code P0778 is defined as a Pressure Control Solenoid "B" Electrical

The Transmission Control Module (TCM) uses Pressure Control Solenoids to control the hydraulic pressure in the transmission which is needed to apply the various clutch packs in the transmission that provide the different gear ratios needed to efficiently propel the vehicle down the roadways. When the TCM detects a pressure control solenoid is not performing as desired, it will set code P0778.

P0778 Symptoms

• Increased fuel consumption
• Transmission may not shift properly

Common Problems That Trigger the P0778 Code

• Transmission Control Module (TCM) failure
• Transmission fluid level is low
• Transmission pressure control solenoid failure
• Wiring issue