Table 1 shows one common equipment related problems of the 2020 Volkswagen Passat.
| Problem Category | Number of Problems |
|---|---|
| Equipment problems |
2020 Volkswagen Passat se 2. 0l VIN: [xxx] complaint summary: I am reporting a persistent and unresolved fault involving the secondary air injection system (dtc p0491 – insufficient airflow) that has resulted in repeated, conflicting diagnoses across multiple repair facilities. This raises concerns about a potential systemic defect affecting this vehicle model. Detailed description: the issue began prior to March 2025 while the vehicle was still under warranty. The vehicle displayed a check engine light associated with diagnostic trouble code p0491 (secondary air injection system insufficient airflow). On April 3, 2025, a repair facility diagnosed the issue as a failed secondary air injection pump and replaced the component. However, the check engine light returned within 24 hours with the exact same fault code, indicating that the repair did not resolve the issue. A second independent diagnostic evaluation was performed later in April 2025. This inspection confirmed that: the secondary air injection pump was functioning correctly airflow through the system was present electrical controls and pcm commands were operating properly the fault was attributed instead to a mechanically stuck secondary air injection combination valve despite this revised diagnosis, the issue has remained unresolved. As of 2026, a dealership evaluation has now attributed the same fault condition to a potential failure within the cylinder head assembly, indicating a significantly more serious underlying condition. Safety concern: this issue involves the emissions and engine air management system and has resulted persistent check engine light repeated failure of emissions-related components conflicting and escalating repair diagnoses across multiple qualified service providers I am requesting that the national highway traffic safety administration review this issue for potential investigation into a systemic defect. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).
VIN: 1vwca7a32lc006863 dealership: vanguard Volkswagen 6900 burnet rd austin, TX 78757 I bought 2020 Passat back in Aug 2020 with carnet included. It was showing that carnet will be installed later when available at no cost. So in 2021 they installed carnet and everything was working fine up until 2024. The light turned off and no connection to the car. I called carnet and they told me that most likely an issue with hw module and suggested to take to the dealer to get reset/replaced. Went to the dealer few days ago. Left them a car for 3 days for diag. No fault codes. So dealer sent a ticket to the Volkswagen to see how to proceed. I got a call from dealership today that Volkswagen responded to them that 2020 Passat is no longer eligible for the carnet. Excuse me? at the time of sale carnet was included. It was working fine no issues. And now Volkswagen taking car feature away that it came with and I paid for. .
Our vehicle will not speed up after accelerating but you can hear the engine making noise like it’s trying to speed up. We have taken our vehicle 3-4 times back to the dealership and they have told us they found nothing.
Park assist not availble. Loss of engine power on left or right turn.