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Communication error - ELM-327
Posted: Wed Feb 16, 2022 2:58 pm
by MartinHU
Hi,
I need help.
Today I bought ELM-327 and I installed VAG DPF.
I selected the device in app, and selected my motor code. (CRLB)
After it I got error massege.
How can I solve the problem?
Device and massage atteched.
Regards,
Martin
Re: Communication error - ELM-327
Posted: Wed Feb 16, 2022 5:41 pm
by admin
The reason is the adapter quality.
I quote here the related FAQ available in this forum (
viewtopic.php?f=9&t=319 ):
Why my adapter works well with tons of OBD apps but doesn't work with VAG DPF?
Other apps use the OBD2 protocol that uses only 2 bytes of data to communicate; VAG DPF uses the full length 7-bytes message communication allowed by the CANBUS ISO protocol, the same used by the official VW diagnostic tester. Almost all cheap china clone OBD adapter are based on a cracked old ELM firmware, modified to work decently just with ODB2 protocol using 2 bytes and a reduced set of instructions. This is the reason why they work with all other apps.
VAG DPF requires a good adapter that fulfill the ELM327 firmware specs. Unfortunately, all vendors declare the compliance with all worldwide existing standards for their cheap products, lying shamelessly.
In the same page of the FAQ you can find also some suggested adapter with proved good quality.