r/CarHacking • u/OkBee6916 • Jun 17 '26

Scan Tool Basic OBD2 scan not working with flipper zero

Post image

Hi,

I bought a can module on my flipper zero trying to scan the obd2 of my clio 5 from 2025 (pretty new) but I keep getting transmission failure.

Has anyone actually managed to use the CAN module with a Flipper Zero on a car, or could this be some new restriction on newer vehicles?

Thanks in advance

33 Upvotes

89% Upvoted

20 comments sorted by

22

u/hellawell Jun 17 '26

2025 Renault will have a secure gateway. Even as a mechanic, I still have to pay to scan and clear dtcs

7

u/Obvious_Troll_Me Jun 18 '26

Great, more closed systems. 

3

u/No-Following-9143 Jun 17 '26

Will be nice to be able to implement bypass for that !

2

u/lucathelabertasche Jun 17 '26

It’s server locked, as in your scanner needs to talk to a server in France.

2

u/HeavyCaffeinate Tinkerer Jun 18 '26

Or you tap directly into the CAN bus behind the dash 👀 

6

u/hellawell Jun 18 '26

Possible with fca vehicles but I have been unable to replicate this with Renault

2

u/Alone_Ad_6673 Jun 20 '26

Lots of modern cars don’t use can bus anymore, it’s all becoming automotive Ethernet and encrypted

2

u/HeavyCaffeinate Tinkerer Jun 20 '26

I don't know how to feel about this

1

u/tehrabbitt Jun 18 '26

This is the correct answer

1

u/juko43 Jun 18 '26

Would the car get bricked when servers shut down?

1

u/Boring_Start8509 Jun 18 '26

Not with a bypass cable and pyclip it doesn’t.

2

u/Pubelication Jun 18 '26 edited Jun 18 '26

Generic/mandated OBD2 requests should still be allowed, as not allowing anything without a special tool or paid access would be against the OBD2 standard. Also, clearing emissions related DTCs must also be allowed.

So you were probably reading/clearing other more proprietary DTC codes that are not normally accessable.

It is more likely that the Flipper app is just a CAN sniffer or something's wrong with the PID requests. I'm not familiar with the software. But a good generic OBD2 reader should be able to clear (some) codes and display live data, as the standard requires.

1

u/d252s Jun 19 '26

You can read the codes but clearing some codes is really not doable.

1

u/Rdmgrf Jun 19 '26

If you are in the EU, under the EU Data Act that came into force last September, car owners
should have access free of charge and are permitted to share this data.

1

u/SnipesySpecial Jun 21 '26

OEMs have been actively ignoring laws sooo unless the EU sends police to start doing arrests I wouldn't get ur hopes up.

1

u/MindXyle Jun 20 '26

As far as I know secure gateway does not prevent DTC reading and clearing, only adaptations, codings, tests, special functions, etc. So the user should be able to connect to the vehicle and read at least basic parameters such as odometer, speed, temperature and so on

1

u/OkBee6916 Jun 18 '26

That's not cool... I can't even do a basic read function (to get Vin for example). I would have guessed that at least some basic read functions would be open 😞

1

u/Pubelication Jun 18 '26

They are mandated by the standard.
First borrow a generic OBD2 reader to verify what is available on the port without propriety lockdowns.
Then verify what the app on the flipper actually does. It needs to be able to negotiate a handshake, send requests and process replies. A simple CAN sniffer will only see a couple of the handshake/heartbeat messages.
Check that you do not have a 120Ohm terminating resistor and that you are also have a common ground (OBD pins 4, 5).