T-Roc Power Loss + Check Engine Light Points to ECU Fault

Last month I experienced similar symptoms on my 2020 VW Golf GTI. The check engine light appeared along with reduced power output, triggered by faulty third-party chip tuning. The diagnostic code revealed issues with the engine control unit programming. When checking with a professional auto scanner, multiple fault codes pointed to inconsistencies in the ECU mapping. The fix required: Complete removal of aftermarket tuning, Restoration of factory ECU settings, Full vehicle diagnostics scan, Test driving to confirm proper engine performance This was a serious issue that could have caused long-term engine damage if left unaddressed. The reduced power mode is actually a protective measure by the car computer to prevent engine damage. Based on your symptoms, I recommend having a certified technician perform a complete vehicle diagnostic scan. Third-party tuning problems often require specialized knowledge to properly diagnose and resolve, especially on newer models with complex engine management systems. The check engine light and power reduction you describe match the classic signs of ECU-related issues. Get it checked soon to avoid potential engine damage.

Thanks for sharing your experience. Had almost identical issues with my T-Roc a few months back. The dashboard light and power reduction really had me worried, but the fault code from my basic auto scanner only told part of the story. Turns out it was actually a failing throttle position sensor causing the vehicle diagnostics system to trigger limp mode. Much simpler fix than I feared. Would you mind sharing roughly what the repair ended up costing you? Also curious if youve had any other check engine lights or performance issues since getting it sorted?

Got my T-Roc back from the mechanic last week and everything runs perfectly now. The car computer shows no more fault codes and the check engine light has stayed off. The vehicle diagnostics confirmed it was indeed caused by problematic chip tuning from an unauthorized provider. The total repair cost was 180€ which covered removing the faulty programming and restoring factory settings. The scan tool showed all systems are now running correctly, and power delivery is back to normal. No performance issues or warning lights since the fix. Looking back, trying to save money with third-party tuning was a mistake. The car diagnostic process showed how these unauthorized modifications can cause serious problems with modern engine management systems. Worth spending a bit more to have things done properly by certified technicians who understand these complex systems.

After getting my T-Roc checked out, the engine issue turned out to be pretty straightforward. Took it to a certified shop where their professional scan tool picked up the exact problem, a faulty mass airflow sensor was triggering the check engine light and power reduction. Total bill came to 320€ including parts and labor. Much better than the 800€ quote I got from another place. The mechanic showed me the diagnostic codes and explained everything clearly. No pushiness or unnecessary add-ons suggested. Been driving for two weeks now with full power restored and no warning lights. Lesson learned about getting a proper car diagnostic done early instead of worrying about worst-case scenarios. The basic scanner I have is useful but professional equipment catches things mine missed. Just wanted to close this thread and let others know how it worked out. Thanks for the helpful advice everyone shared here about getting these engine issues properly diagnosed.