HI there
This code shouldn't affect the transmission or it's shifting. Check the fluid level and make sure it's clean.
The code points to an issue with the bank 1 oil control solenoid for the variable timing. Here are some possible causes.
P0026 SUBARU - Intake Valve Control Solenoid Circuit Range/Performance Bank 1 Read more: https://www.autocodes.com/p0026_subaru.html
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