A module for SAE J1850 VPW communication with General Motors vehicles
Project description
pyVPW
A Python module for SAE J1850-VPW communication with 1999-2003 General Motors PCMs using ELM327 scan tools.
Features
- define and request diagnostic data packets (DPID)
- read and decode PIDs
- send and receive and VPW messages
- read and write data blocks (VIN, Serial Number, OSID, etc.)
- unlock PCM
- change VIN
vin_writer.py usage
python vin_writer.py [portname] [vin]
Supported OSIDs
- 12212156 (p01)
- 9384022 (p04)
- probably more, see
pcm.py
References
- PCM Hammer - Tools for reading, writing, and data logging from GM PCMs. Lots of great info here.
- pcmhacking.net - PCM Hacking forum
- SAE J1850 - Describes message protocol
- SAE J1979 - legislated diagnostic test modes ($01-0A)
- SAE J2190 - non-legislated modes (Extended PIDs, DPIDs, reading/writing memory, etc.)
- SAE J2178/1 - detailed header format and physical address assignments
- GM SeedKey Algorithm Paper - Reverse engineered PCM unlock algorithm
- ELM327 Datasheet
Release history Release notifications | RSS feed
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