P0721: owner reports and bulletins
Got P0721 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
23 complaints filed with NHTSA mention P0721, 22 of them since 2015, across 4 different models. The component owners most often filed it under: power train.
Most-reported models
| Vehicle | Complaints | Model years reported |
|---|---|---|
| FORD F-150 | 20 | 2011, 2012, 2013, 2014, 2015 |
Manufacturer service bulletins that name P0721
4 technical service bulletins and manufacturer communications filed with NHTSA mention P0721, from 3 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- RAM 1500 (2019), bulletin 10173360: Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Some customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon furthe…
- FORD F-150 (2018), bulletin 10137122: Some 2018 Expedition/F-150/Mustang/Navigator vehicles equipped with a 10R80 automatic transmission and built on or before 30-Nov-2017 may exhibit an illuminated malfunction indicator lamp (MIL) with diagnostic trouble co…
- CHEVROLET MALIBU (2017), bulletin 10113422: This Preliminary Information communication provides information to the technician about vehicles that have a Service Engine Soon Malfunction Indicator Lamp on. Technician may find Diagnostic Trouble Codes P0721, P0722, P…
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.