Technical Description of OBD-II Trouble Code
The Shift Solenoid E is stuck in the “on” position.
What does that mean?
This is a generic diagnostic trouble code (DTC) for transmission issues and is typically found in OBD-II vehicles with automatic transmissions.
This can apply to various vehicles including those from Chrysler, Ford, Dodge, Hyundai, Kia, Ram, Lexus, Toyota, Mazda, Honda, VW, etc. While the general steps for repair may vary depending on the year, make, model, and powertrain configuration, the code is applicable to all.
Most automatic transmissions have multiple shift solenoids, depending on the number of gears. The trouble codes associated with the “E” solenoid are P0770, P0771, P0772, P0773, and P0774. These codes indicate specific malfunctions that trigger the PCM to set the code and illuminate the Check Engine Light. If your vehicle has an Overdrive or other transmission warning lamp, it may also be illuminated.
The purpose of the Shift Solenoid Circuit is for the PCM to monitor the shift solenoids, manage fluid movement between hydraulic circuits, and change the transmission gear ratio at the appropriate time. This process optimizes engine performance at the lowest RPM possible.
Automatic transmissions rely on bands and clutches to change gears, which requires proper fluid pressure. The transmission solenoids open or close valves in the valve body to allow transmission fluid to flow to the clutches and bands, ensuring smooth shifting as the engine accelerates.
When the Powertrain Control Module (PCM) detects a malfunction in the Shift Solenoid “E” Shift Circuit, various codes can be triggered depending on the specific vehicle, transmission, and number of gears. In this case, the P0772 OBD-II trouble code indicates a detected stuck on transmission Shift Solenoid “E”.
Example of shift solenoids:
What is the severity of this DTC?
The severity of this code typically starts as moderate but can rapidly progress to a more severe level if not addressed promptly.
What are some of the symptoms of the code?
Symptoms of a P0772 trouble code may include:
What are some of the common causes of the code?
Causes for this P0772 transmission code may include:
What are some P0772 troubleshooting steps?
Prior to beginning the troubleshooting process for any malfunction, it is recommended to research the Technical Service Bulletins (TSB’s) for the specific vehicle by year, model, and transmission. This can save time by providing guidance in the right direction. It is also important to check the vehicle records to verify the last time the filter and fluid were changed, if possible.
Fluid & Wiring Inspections
The first step is to ensure the fluid level is correct and inspect the condition of the fluid for contamination. Then, perform a thorough visual inspection of the associated wiring for any obvious defects such as scraping, rubbing, bare wires, or burn spots.
Next, check the connectors and connections for security, corrosion, and damaged pins. This includes all wiring and connectors to the transmission solenoids, transmission pump, and the PCM. Additionally, inspect the transmission linkage for security and binding issues based on the configuration.
Advanced Steps
The advanced steps are highly vehicle-specific and require the appropriate advanced equipment for accurate diagnosis. These procedures involve using a digital multimeter and referencing the specific technical data for the vehicle. Voltage requirements will vary based on the specific year and model. It is important to follow the specific troubleshooting chart for your vehicle.
Continuity Checks
Continuity checks should always be performed with the power removed from the circuit. The normal readings for wiring and connections should be 0 ohms of resistance unless otherwise specified by the technical data. Resistance or no continuity indicates faulty wiring that is open or shorted and must be repaired or replaced.
What are some common repairs for this code?
We always recommend seeking professional mechanical service to address this issue. However, if that is not possible, we offer the option to permanently delete this specific DTC while keeping all other codes active. If you are interested in this option, please upload your ECU file to our portal.
