VW Virtus Starter Motor Failing: Quick Diagnostic Guide

Had the same issue with my 2015 VW Jetta TSI. The symptoms matched exactly, slow cranking and multiple start attempts needed, particularly after sitting overnight. Initial diagnosis pointed to the charging system, but testing revealed a failing battery that wasnt holding proper charge. Even though the alternator showed normal voltage while running, the battery had developed internal resistance issues. The main problem trace led through the electrical fault detection system, starting with checking the fuse box connections and circuit breaker status. The starter motor itself tested fine, but wasnt getting adequate power from the degraded battery. This required a complete battery replacement plus cleaning of all terminal connections and ground points. The fix proved permanent, no starting issues since then. Would recommend having the entire charging system tested before replacing parts, as a weak battery can mimic various electrical problems. For reference, this was a serious repair that required professional diagnostic equipment to properly identify the root cause. Most shops should be able to test the charging system and battery health to determine if you have a similar situation. Essential to address this promptly as continuing to run with a failing battery can potentially damage the starter motor and other electrical components over time.

Thanks for sharing your experience. My Virtus had pretty much identical symptoms last winter. After reading your post, I am more convinced it was also a battery issue rather than the starter motor I initially suspected. Did you experience any voltage drop issues after the repair? Also wondering how much the complete fix ended up costing you, including the diagnostics? I noticed my ignition switch feels a bit sluggish too, so might need to get that checked while they are at it.

Got my Virtus back from the mechanic last week and can confirm the Terminal 30 continuous plus issue has been fully resolved. The main problem was indeed a heavily discharged battery that was causing the voltage drop across multiple systems. The complete diagnostic and repair came to 290€, which included testing the charging system, replacing the battery, and cleaning all connections. My ignition switch actually started working normally once the proper voltage was restored, it was just another symptom of the failing battery. Since the fix, starting has been consistently strong with no voltage drop issues whatsoever. The electrical fault detection showed everything working within spec after the repair. Definitely worth getting the complete system checked rather than just replacing parts out of nowhere. The fuse box connections were also inspected as part of the diagnostic process, which helped confirm the battery was the root cause rather than a broader electrical fault. The circuit breaker tests all came back normal, confirming the charging system itself was functioning properly.

Thanks for the helpful advice. I took my Virtus to the shop yesterday. The mechanic ran a full diagnostic and found a failing battery, just as suggested. The voltage drop test confirmed the battery was only operating at 40% capacity. The total repair came to 320€ including a new battery, terminal cleaning, and system testing. Quite relieved it wasnt the starter motor or a more serious electrical fault. The car now starts immediately every time with strong cranking. The charging system and circuit breaker tests all came back normal. Even the sluggish ignition switch I mentioned cleared up completely once the new battery was installed. Really glad I got a proper diagnosis instead of just guessing at parts replacement. Will definitely keep a closer eye on battery maintenance going forward to avoid similar issues. Thanks again for helping me understand the symptoms and likely causes before visiting the shop.