Levorg's Multiple Electrical Failures Frustrate Owners

Had almost identical issues with my 2016 Subaru WRX. Started with unusual warning lights and the infotainment going crazy. As someone with moderate car repair experience, I first tried using a scan tool to clear the codes, but they kept coming back. After several attempts at DIY diagnosis, I took it to a workshop. The technician found that the main control module had a damaged cable connection to the vehicle BUS system. This explained why multiple systems were acting up simultaneously, they simply couldn't communicate properly. The repair involved replacing the damaged wiring and reconnecting the control module properly. Total cost was 155€, and it completely resolved all the electrical gremlins. No more unusual warning lights or system failures since then. Before suggesting specific fixes for your Levorg, could you share: Have you checked if all electrical connections are properly seated? Are the issues more frequent when driving over bumpy roads? What specific error codes is your check engine light showing? Did these problems start suddenly or develop gradually? This information would help determine if your issue is similar to what I experienced with my WRX.

Thanks for the detailed response. My Levorg currently shows 175273 KM and the last service was done just 2 months ago. I noticed the issues started gradually after that service. I checked the connections as suggested, they seem properly seated. The OBD-II scan tool shows multiple intermittent codes, mainly P0605 and U0100, pointing to control module issues. The warning light patterns seem unusual, not related to road conditions. I connected with the service center and they confirmed no wiring work was done during the last maintenance. The system failure symptoms have gotten worse over the past 2 weeks. Think I will need to get it checked professionally since the error codes keep returning even after clearing them.

Based on your error codes and symptoms, this definitely sounds like an ECM/PCM issue that could be related to the recent service. The P0605 specifically points to a control module ROM error, while U0100 indicates lost communication with the ECM, matching the unusual system failures youre experiencing. Had almost the exact situation with my WRX after a service last year. The malfunction indicator kept coming on out of nowhere, and the scan tool showed similar communication error codes. Turned out some connector pins got slightly bent during routine maintenance work near the ECM. Since your issues started post-service, request they specifically check: ECM connector pin alignment and integrity, Ground connection points for the control modules, Power supply voltage to the ECM The warning light behavior and multiple system failures match what I experienced before the bent pins were discovered. This kind of issue often gets worse over time as the connection deteriorates further. The progressive nature of your symptoms strongly suggests a physical connection problem rather than module failure. A professional diagnostic session should be able to pinpoint the exact cause, likely for much less than a full module replacement would cost.

Since the issue started after my last service and is getting progressively worse, I definitely need to have this checked professionally. The P0605 and U0100 codes point to serious control module communication problems that could be related to damaged connections during the recent maintenance. I will schedule an appointment and have them specifically investigate the ECM connector pins, ground points, and power supply connections. The OBD-II scan tool keeps showing these error codes even after clearing them, which really suggests an underlying hardware issue rather than just a temporary system failure. Good to hear your similar warning signal problems were resolved by fixing bent connector pins. Hopefully my Levorg has a similarly straightforward fix and wont need a complete module replacement. Will update once the workshop diagnoses the exact cause of these electrical gremlins. Thanks for sharing your experience, it helps narrow down where to look for the root cause.