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
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Electrical System problems in other A4 years
| Year | Reports | Share |
|---|---|---|
| 2020 A4 | 91 | 72% |
| 2017 A4 | 6 | 11% |
| 2015 A4 | 3 | 16% |
| 2014 A4 | 3 | 9% |
| 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.