P0700 Subaru Outback
Transmission Control System Malfunction · Powertrain Code · High
What is P0700?
A general transmission fault code indicating the transmission control module has detected a problem. Check for additional transmission codes.
When the Subaru Outback triggers code P0700 (transmission control system malfunction), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Subaru Outback.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Subaru Outback.
Common Causes on Subaru Outback
- TCM has stored a CVT (Lineartronic) fault code
- CVT fluid degradation from overheating
- CVT valve body malfunction
- Internal CVT mechanical issue
- TCM wiring or connector problem
Symptoms
- Check Engine Light on
- AT TEMP light flashing
- Harsh or jerky CVT operation
- CVT slipping
- Limp mode with limited gear range
Notes for Subaru Outback
Subaru Lineartronic CVTs require genuine Subaru CVT fluid only; aftermarket fluid can cause shudder and accelerated wear.