C1241: owner reports and bulletins
Got C1241 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
24 complaints filed with NHTSA mention C1241, 18 of them since 2015, across 13 different models. The component owners most often filed it under: service brakes.
Most-reported models
| Vehicle | Complaints | Model years reported |
|---|---|---|
| TOYOTA HIGHLANDER HYBRID | 5 | 2006, 2007, 2008 |
| TOYOTA SEQUOIA | 4 | 2002, 2003 |
| TOYOTA HIGHLANDER | 4 | 2008, 2009, 2011, 2018 |
Manufacturer service bulletins that name C1241
1 technical service bulletins and manufacturer communications filed with NHTSA mention C1241, from 1 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- MCI D4000 (2012, 2011), bulletin 10119143: This Service Bulletin informs affected customers that MCI was notified by Cummins Inc. that it has issued campaign C1241 that addresses a calibration issue, which results in the engine brakes being energized with 24 volt…
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.