The P0777 error code on a Jeep Compass indicates a problem with the transmission control system, specifically pointing to a malfunction within the solenoid C. This article details troubleshooting steps taken to address P0777 and other related codes, along with a discussion of maintenance performed. We’ll cover accessing the transmission connector, testing components, and potential solutions for persistent issues.
Accessing the transmission connector, located on the driver’s side of the transmission body, is crucial for troubleshooting. There are two methods: removing the battery tray (impractical for live testing) or removing the motor cover and tire. The latter involves pushing a click mechanism and turning left.
Troubleshooting for codes P0746 and P0777 involved checking for failures. While no initial faults were found, regular maintenance, including a CVT oil and filter change, was performed. New primary and secondary sensors (Sonnar brand) and a stepped motor were also installed.
While helpful, the ATP-235 kit’s gasket resulted in a leak despite applying the recommended 70 in/lb torque. This requires further investigation. Following maintenance, both codes persisted. A TCM module reset using JScan was performed, followed by a test drive, but the P0777 code remained, and new errors emerged.
Further troubleshooting on the new errors included checking wiring and component resistance. Solenoids and the step motor showed expected resistance values. However, testing voltage on the line and secondary solenoids when active, using JScan, resulted in an error.
According to the manual, these errors could indicate wiring, solenoid, or TCM issues. With wiring problems ruled out, the next step is replacing the solenoids with remanufactured units (new ones being reportedly unavailable) and addressing the gasket leak.
Information on actuating solenoids using JScan, CVTz50, or other OBD apps is sought, along with sources for brand new solenoids. Resolving the P0777 code in a Jeep Compass often requires a systematic approach to eliminate potential causes. This process involves testing individual components and performing necessary maintenance to ensure proper transmission function.
