Faulty VW Passat Hybrid Stalls with Rough Engine

Had nearly identical symptoms with my 2019 VW Arteon Hybrid. The rough engine performance and frequent stalling turned out to be more than a basic fuel pump failure. A thorough diagnostic revealed corroded wiring connections at the fuel pump control module. The issue started with occasional hesitation, then progressed to complete engine stalling, especially during idle. Auto repair revealed three main problems: damaged wiring harness, compromised gasoline delivery system, and a faulty sensor connection at the pump assembly. The repair required: Complete fuel pump assembly replacement, Rewiring of the control module connections, New fuel pressure sensors, System reprogramming This was classified as a serious repair due to the risk of complete system failure and potential damage to other components. The full repair took 3 days, requiring specialized diagnostic equipment to properly calibrate the hybrid system. After repair, fuel economy returned to normal and all stalling issues were resolved. Would strongly recommend finding a shop specializing in hybrid vehicles, as proper diagnosis requires specific expertise with both conventional and hybrid systems. The symptoms you describe strongly suggest fuel delivery issues, but getting comprehensive diagnostic testing is crucial before replacing parts.

Thanks for sharing your experience. This exactly matches what I am going through with my Passat. Really helpful to know the root cause was in the wiring and fuel system rather than just a pump failure. The fuel injector issues and stalling problems sound identical. Cannot tell you how frustrated I was with incorrect automotive diagnosis from my regular mechanic. Did the complete repair package solve all issues for good? Would be great to know how much you ended up paying for the full auto repair and if any other problems surfaced since then.

The complete repair did solve all issues permanently. Looking back, my case was much simpler than initially feared, the automotive diagnosis revealed just a damaged connection at the fuel pump control module rather than a complete pump failure. The repair shop found the root cause quickly after proper testing of the fuel delivery system. Total cost came to 95€ for fixing the loose wiring connection. No additional issues with the fuel injector or pump assembly since the repair was completed two months ago. Car performance returned to normal immediately after the fix. The rough running and stalling completely disappeared, and fuel consumption went back to factory specifications. This really highlighted how a seemingly major problem can sometimes have a straightforward solution when diagnosed correctly. The key was finding a shop with proper diagnostic equipment who took the time to check the electrical connections before assuming a complete pump failure. Would definitely recommend getting a second opinion if your mechanic suggests replacing the entire fuel system without thorough testing first.

After that useful advice, I finally found a specialized hybrid repair shop. The mechanic did a complete diagnostic scan and discovered damaged wiring connections at the fuel pump module, just like you described. The whole fuel delivery system was thoroughly tested before any repairs began. The actual fix was relatively simple, they repaired the corroded wiring harness and replaced a faulty sensor. Total repair cost was 180€ and took about 4 hours. Such a relief it wasnt a complete fuel pump failure requiring replacement of the entire assembly. My Passat now runs perfectly with no more engine stalling or rough idle issues. Fuel consumption is back to normal too. Looking back, I wasted time with my regular mechanic who lacked the right diagnostic tools for hybrid systems. Really glad I got that second opinion from a specialist who properly identified the root cause in the fuel system wiring.