U1504: owner reports and bulletins
Got U1504 on your scanner? Tell the mechanic your year, make, model and any symptoms and you'll get the likely cause and what to check first. Ask about this code.
What owners report to NHTSA
6 complaints filed with NHTSA mention U1504, 6 of them since 2015, across 2 different models. The component owners most often filed it under: electrical system.
Most-reported models
| Vehicle | Complaints | Model years reported |
|---|---|---|
| CHRYSLER 200 | 4 | 2015, 2016 |
Manufacturer service bulletins that name U1504
18 technical service bulletins and manufacturer communications filed with NHTSA mention U1504, from 4 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- JEEP RENEGADE (2017), bulletin 10178702: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illu…
- JEEP CHEROKEE (2017), bulletin 10180275: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illu…
- FIAT 500X (2017), bulletin 10121806: Flash: Powertrain Diagnostic and System Improvements This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest software. Customers may experience a Malfunction Indicator Lamp (MIL) illumina…
- CHRYSLER 200 (2015), bulletin 10140043: Flash: Powertrain Diagnostic and System Improvements This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. A small number of customers may experience a Malfunction I…
- DODGE DART (2012, 2014, 2015), bulletin 10140043: Flash: Powertrain Diagnostic and System Improvements This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. A small number of customers may experience a Malfunction I…
Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.