P2710 Error Code in Volkswagen Golf GTE 2016: Fix for Shift Solenoid Intermittent Issue

Good evening, I’ve owned my 2016 Volkswagen Golf GTE for two years and it has been running perfectly until recently. Suddenly, I started receiving the P2710 diagnostic code, which indicates an intermittent fault in the shift solenoid (F) of the transmission. To clarify: The car originally had a known issue with gearboxes — specifically, a grillé filter inside the mechatronic system that would loosen and fall into the solenoid, preventing proper switching between the thermic and electric engine. While this was initially managed with the default mode allowing both engines to operate, I decided to park the vehicle until repairs were completed. I recently replaced several components: a new shift solenoid, transmission fluid, filter, and gaskets. The installation went smoothly, and all mechanical steps appeared successful. The next step was to use diagnostic software (offline version with latest update) to initiate the electric engine’s water pump to reach the correct coolant level. This step succeeded. However, when attempting to start the thermic engine, it failed to ignite — the engine attempts to crank but does not start. After clearing the error code, I rechecked and found that the system now displays P2710 (Shift Solenoid F Intermittent). The car runs perfectly in electric mode and gear shifts are smooth, but switching to thermic mode is impossible. I want to know: Could this be a faulty solenoid despite the code being P2710 rather than the previous P288400? Is there any possibility that the Powertrain Control Module (PCM) detects an offline diagnostic tool and refuses to allow engine startup? Is there an anti-theft mechanism in the mechatronic system that could be triggered during this process? I’ve used a standalone diagnostic tool (VCDS), and I’m concerned about whether improper oil drain procedures — such as not disengaging valve N93 (responsible for regulating low/high oil pressure) — might have damaged or disrupted the solenoid function. My friend who performed the fluid change did not disconnect this valve, and I suspect this may have caused a loss of communication between the mechatronic system and the transmission. I’m currently waiting until Sunday to complete diagnostics, so any insights on how to proceed would be greatly appreciated. Thanks for your help!