2018 Audi A4 electrical system problems
17 owner complaints filed with NHTSA name the electrical system on the 2018 Audi A4 — 39% of all complaints for this model year.
What owners report
“A vehicle diagnostic scan dated 04/15/2026 showed electrical communication faults involving vehicle control modules. The scan showed U014100, described as “Lost Communication With Body Control Module ‘A’,” with status listed as passive/sporadic. The scan also showed U112100, described as “Data bus…”
filed Jul 2, 2026
“A vehicle diagnostic scan dated 04/15/2026 at approximately 88,502 miles showed a stored transmission electronics fault: P084100, described as “Transmission fluid pressure sensor/switch A range/performance,” with status listed as passive/sporadic. This indicates a transmission / powertrain control…”
filed Jul 2, 2026
“The vehicle is subject to a Passenger Occupant Detection System / PODS safety recall involving the front passenger seat occupant-detection system and passenger airbag status. The concern is that the system may incorrectly detect whether a passenger is seated and may switch off or affect the front passenger airbag when…”
filed Jul 1, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This bulletin provides informatoinw hent here are scratches or a coating on the cover of the instrument cluster, or particles inside of the housing.
TSB_2073747_4 · Service Bulletin/Repair Instructions · issued Jul 9, 2026This bulletin provides information when there are noises from the area around the instrument cluster.
TSB_2059335_7 · Service Bulletin/Repair Instructions · issued Jun 23, 2026This bulletin provides informationwhen noises/vibration are detected from front of vehicle in dynamic mode.
TSB_2074729_3 · Service Bulletin/Repair Instructions · issued Jun 23, 2026
Electrical System problems in other A4 years
| Year | Reports | Share |
|---|---|---|
| 2020 A4 | 89 | 72% |
| 2017 A4 | 6 | 11% |
| 2015 A4 | 3 | 16% |
| 2014 A4 | 3 | 10% |
| 2013 A4 | 2 | 8% |
| 2012 A4 | 2 | 11% |
| 2010 A4 | 2 | 3% |
| 2009 A4 | 3 | 3% |
| 2008 A4 | 9 | 5% |
| 2007 A4 | 10 | 5% |
| 2006 A4 | 21 | 7% |
| 2005 A4 | 24 | 11% |
Other reported problem areas on the 2018 Audi A4
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.