C1391: owner reports and bulletins
Got C1391 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
379 complaints filed with NHTSA mention C1391, 367 of them since 2015, across 20 different models. The component owners most often filed it under: service brakes.
Most-reported models
| Vehicle | Complaints | Model years reported |
|---|---|---|
| TOYOTA PRIUS | 215 | 2010, 2011, 2012, 2013, 2014 |
| TOYOTA PRIUS V | 44 | 2012, 2013, 2014, 2015 |
| TOYOTA HIGHLANDER | 28 | 2006, 2008, 2009, 2010, 2012 |
| LEXUS CT | 22 | 2011, 2012, 2013, 2014, 2015 |
| TOYOTA HIGHLANDER HYBRID | 20 | 2006, 2007, 2008, 2010, 2012 |
| TOYOTA CAMRY HYBRID | 14 | 2007, 2008, 2014 |
| TOYOTA PRIUS PLUG-IN HYBRID | 7 | 2010, 2012, 2013, 2014 |
| TOYOTA PRIUS C | 7 | 2012, 2013, 2014 |
| TOYOTA CAMRY | 6 | 2007, 2009 |
| LEXUS RX HYBRID | 3 | 2006, 2013 |
Manufacturer service bulletins that name C1391
28 technical service bulletins and manufacturer communications filed with NHTSA mention C1391, from 2 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- LEXUS RX HYBRID (2016, 2017, 2018, 2019), bulletin 10234304: TSB: Some 2016 ? 2019 model year RX 450h vehicles may exhibit a condition where the brake, ABS, and/or TRAC warning lights are on and/or a Check VSC message displays. One or more of the following specific Diagnostic Trou…
- TOYOTA PRIUS V (2016, 2017, 2018), bulletin 10234318: TSB: Some 2016 ? 2018 model year Prius V vehicles may exhibit a condition where the brake, ABS, and/or TRAC warning lights are on and/or a Check VSC message displays. One or more of the following Diagnostic Trouble Codes…
- LEXUS LS460 (2013, 2014, 2015, 2016), bulletin 10234302: TSB: Some 2013 ? 2017 model year LS 460 vehicles may exhibit a condition where the brake, ABS, and/or TRAC warning lights are on and/or a Check VSC message displays. One or more of the following specific Diagnostic Troub…
- LEXUS CT HYBRID (2014, 2015, 2016, 2017), bulletin 10252263: TSB: Some 2014 ? 2017 model year CT 200h vehicles may exhibit a condition in which the brake, ABS, and/or TRAC warning lights are on and/or a Check VSC message displays. One or more of the following specific Diagnostic T…
- TOYOTA PRIUS C (2015, 2016, 2017), bulletin 10252260: TSB:Some 2015 ? 2017 model year Prius C vehicles may exhibit a condition where the brake, ABS, and/or TRAC warning lights are on and/or a Check VSC message displays. One or more of the following Diagnostic Trouble Codes …
- TOYOTA HIGHLANDER HYBRID (2014, 2015, 2016, 2017), bulletin 11011632: This Customer Support Program provides coverage as it applies to Brake Booster and Brake Booster Pump Assemblies on Certain 2014-2016 Model Year Highlander HV and certain 2017 Model Year Prius V Vehicles. The specific co…
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.