P1720: owner reports and bulletins
Got P1720 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 P1720, 5 of them since 2015, across 3 different models. The component owners most often filed it under: power train.
Most-reported models
| Vehicle | Complaints | Model years reported |
|---|---|---|
| JEEP CHEROKEE | 4 | 2015, 2016 |
Manufacturer service bulletins that name P1720
16 technical service bulletins and manufacturer communications filed with NHTSA mention P1720, from 2 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- JEEP CHEROKEE (2014, 2015, 2016, 2017), bulletin 10198449: Power Transfer Unit (PTU) Broken Input Spline - X89 Warranty Extension This bulletin involves replacing the PTU assembly with an updated part. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upo…
- RAM PROMASTER CITY (2015, 2016), bulletin 10138937: Flash: Transmission Shift and Driveability Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. Customers may experience a Malfunction Indicator Lamp…
- JEEP GRAND CHEROKEE (2014), bulletin 10148921: Flash: Transmission Shift And Drivability Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software followed by a drive validation. The following software …
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.