P2637: owner reports and bulletins
Got P2637 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 P2637, 2 of them since 2015, across 3 different models. The component owners most often filed it under: power train:automatic transmission.
Most-reported models
| Vehicle | Complaints | Model years reported |
|---|---|---|
| PONTIAC SOLSTICE | 4 | 2006, 2007 |
Manufacturer service bulletins that name P2637
5 technical service bulletins and manufacturer communications filed with NHTSA mention P2637, from 2 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:
- CUMMINS X15, bulletin 10187156: This Technical Service Bulletin describes the verification and resolution of Allison Transmission Fault P2637 caused by engine control module calibration.
- CUMMINS L9, bulletin 10212542: This Technical Service Bulletin describes the verification and resolution of an issue with Allison Transmission Fault P2637 being caused by the Engine Control Module (ECM) Calibration. Cummins is releasing ECM calibratio…
- CUMMINS CUMMINS, bulletin 10111662: This Technical Service Bulletin describes the verification and resolution to the Allison transmission control module setting diagnostic trouble code P2637 (J1939 SPN 513 FMI 7) caused by an Engine Control Module (ECM) ca…
- BLUE BIRD VISION (2018), bulletin 10116464: The intent of service memorandum SM1702 is to make Blue Bird dealers aware that Cummins has released a calibration update improvement to reduce occurrence of Allison transmission fault code P2637 ?Torque Management Feedb…
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.