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Questions tagged [obd-ii]

OBD-II is an automotive term referring to the diagnostic system of a car. The OBD-II specification includes standardized hardware and message protocols. With an OBD-II connector, it's possible to read the diagnostic data from the car, e.g., vehicle speed, RPM, mileage, airflow.

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323 questions
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OBD2 How can I check that ignition is turned off

I've connected to OBDKey and obtained data. I want immediately close my program when the vehicle is powered down(ignition turned off) How can I check that ignition is turned off?
vic
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Is it possible to read manufacturer specific codes with ELM327

I plan on creating a SW which interacts with the CAN bus (for Cars) over OBDII protocols. The SW will be for PC mainly, and perhaps Android. However, it is no use if I cannot adapt it to read more codes than what is legislated and "public". Is it…
obd_dude
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java.io.IOException: bt socket closed, read return: -1

As i am working on OBD Reader Demo .Through my app i am trying to connect obd reader device and my app is installed in Nexus 7.OBD Reader device is connecting to other apps which is available on google play but if i am connecting with my app it is…
Poonam Kukreti
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Android OBD-II How to clear distance travelled (PID0131)?

I working on an app that I need to calculate distance travelled from point A to point B (by car). I asked Elm Electronics (chipset manufacturer) and they said there is no standard OBD-II PID to return mileage from odometer, although car…
Hesam
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Addressing ECUs directly using ELM 327 dongle and ISO 9141

I have a VW Golf 4, which is quite old and talks KWP 2000 (ISO 9141) on its CAN bus. I use a dongle powered by ELM 327, connected to the OBD-2 port of the car. I am trying to send messages individually to each ECU. I tried to change the header of…
csima
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How can I read/write data to and from an OBD-II adapter with Windows Phone 8?

I am currently working on a Windows Phone 8 application, which will (hopefully) have the capabilities to connect to a vehicle via bluetooth using a bluetooth OBD-II adapter. I'm reasonably new to programming for WP8, although I'm attempting to not…
MattVon
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How can I make continuous communication with OBD II ELM327 adapter?

Currently I am working on an app where I have established a connection with OBD II ELM 327 adapter and I can read data from OBD II. e.g. I have used OBD command "01 0C" to get rpm of vehicle. I want to retrieve real time data e.g. speed or rpm from…
KavitaDev
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ELM327 returns nothing when sending several Commands

I'm developing a WPF application, which interacts with my ELM327. It's connected to my PC via bluetooth and it's able to establish it successfully. When I manually send one command at a time (e.g. "010C\r") it properly returns me the RPM of my car…
user13575187
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Python: How To Convert An Object To An Integer

I'm creating a program in Python 3.5.3 on my Raspberry Pi 3 B+ to interface with my car's OBDII port. The connection is established over Bluetooth correctly, the data reads correctly when the Python-OBD library is used as intended, but unfortunately…
Charles Phillips
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Which GATT Profile and Services are used by OBD BLE Adapters like LELink, Automatic, Carista?

I am exploring building apps (Android & iOS) for Car OBD2 Adapters that support BLE (Bluetooth Low Energy). In order for the app to be able to work with such adapters from different vendors, I presume there would be a standard set of GATT profile…
Aashish Singla
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How to connect to OBDII via Android Bluetooth

Currently I've been using this reference http://blog.lemberg.co.uk/how-guide-obdii-reader-app-development but I am still confused on what the next steps are for my Android app to be able to connect to the OBDII. I found code online for a simple…
dgo1970
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OBD2Kit Swift example can't typecast, keep getting nil

Since there was no example code for using OBD2Kit and Swift I forked it into https://github.com/YannisDC/OBD2Kit and used it as a pod. I translated some OBJ-C example code but can't seem to downcast the FLWiFiScanTool into the ELM327 type. Why do I…
YannisDC
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Can we use the OBD-II port to control a car?

I know that the OBD-II port can be used to monitor the different parameters of the car for diagnostics. But is it possible to drive the car using the OBD-II port, without hacking or reprogramming the computer system of the car? I've heard that the…
vpp
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Communicating with a Bluetooth OBDII dongle (I think it's an ELM327)

I have a Bluetooth OBDII dongle for my car (the brand is Veepeak), and I'm trying to write a Windows app that can communicate with it. So far it seems that I'm able to connect to the device from my laptop, send commands, and receive some sort of…
Connor Szczepaniak
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USB bluetooth dongle with PuTTY

I have a USB Bluetooth dongle that I am trying to use in order to extract information from an ELM327 OBD-II interface. I am trying to communicate with the ELM327 through PuTTY. According to the ELM327 documentation, I need to use baud rate 38,400 if…
Ko Ga
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