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Questions tagged [can-bus]

CAN (Controller Area Network) bus (internal vehicle communications network) is a message-based protocol, designed originally for automotive applications, but can now be found in aerospace and maritime as well. This is a standard which allows different parts within a vehicle to communicate with each other without the use of a host computer.

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Are all OBD current data available on the CAN-BUS without request?

I am analyzing the CAN-BUS data from my motorcycle. I logged all the CAN-BUS traffic. One time with an ELM327 adapter connected and one time without. I am searching for the value of the Intake air ...
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Is there a library support CAN Transport protocol?

I have a redboard CAN shield. To make it works with Arduino Mega board, I install the library the device recommended. https://github.com/sparkfun/SparkFun_CAN-Bus_Arduino_Library Who can tell me if ...
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using OBDII with can-utils Ubuntu

i'm trying to figure out a way to communicate with my OBDII using can-util lib but i'm facing lots of issues my question is "is what i'm trying to do possible" if so why when i connect my OBDII the ...
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Mapping VW DTCs from a scantool to the raw data obtained

I scanned a VW Golf TDI 2015 using a scantool (at a workshop) and it gave the following 2 codes - Engine module: P0103 - Mass Air Flow (MAF) (G70): Signal too High Instrument cluster module: ...
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Getting secondry can bus data via PRIMARY can bus

I want to get the data of the middle or lower can bus that is connected to BCM (body control management) via the high baud can bus -that is connected to the Obd port. Does someone has did it? What ...
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Can I transmit messages to ECUs via OBD without access to CAN Bus

I am new to automotive electronics and have been reading about OBD and CAN bus. what i undnerstand is OBD port is kind of a standard now, so my questions are If I get control of OBD port through my ...
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Interfacing with CAN bus

I am looking to write an application in C# and use both ARM based computers and x86 based computers. My question here is when using a J1939 to DB9 cable, do I need a specialized interface for the CAN ...
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Understanding the CAN Bus

I am looking to write an application that works with the J1939 protocol which is part of CAN (Controller Area Network) for vehicle engines. I am reading on this but I am getting some conflicting ...
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Is there a way to transmit a CAN bus signal over a high current DC line?

I would like to use a high current cable with batt + and chassis ground from the vehicle to the trailer, and also use the same cable to transmit a CAN bus signal to the trailer. Is there a way to get ...
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1answer
77 views

Is FMS data more reliable and plentiful than OBD data?

Im looking into both OBD and FMS. I have read that FMS provides more data, yet obd seems to have much more PIDs available? Is this correct or am i missing something. Thank you
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298 views

What's the relationship between CAN identifier and ECU in OBD-II standard

Scenario When getting car datasets constructed by logging CAN traffic via the OBD-II port from a real vehicle for the intrusion detection, I've got the some CAN frame with 11-bit CAN identifier, for ...
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Where are the Logics and Data of the OBD System Stored?

I'm wondering if OBD Data is stored and processed on it's own board or integrated into other systems, or both. Or neither. Wikipedia just confused me further. What I got out of the wiki is that OBD ...
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33 views

Extending CAN network with additional sensors

simple question with a probably complex answer, can I extend a cars CAN network and wire in additional sensors to it? If yes can I get pressure and temperature senders for a CAN network (oil, water ...
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1answer
98 views

Weird OBD2 error on newer Honda models

We are using an OBD device (https://freematics.com/products/freematics-one-plus/) for some research work. We tested on several cars like Honda 2006, Subaru 2018, VW Golf 2013, Mercedes GLK 2017, etc. ...
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Car remote starters on push to start cars

I have a few questions about installing remote starter kits and other aftermarket alarm systems on cars that are push to start(Smart key fob no keys). If the car doesn't start unless you have the key ...
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U0100 Toyota Aygo CAN Stop Communication or DTC Diagnostics, which is right?

I spent a lot of time trying to resolve some problems with a 2006 Toyota Aygo. The most important or significant code it has is U0100: No communication with ECM/PCM A. Information for 1KR-FE engine, ...
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260 views

Calculating power consumption through OBD port

I need to calculate the power consumption of my device. The device is composed of an esp32 board with a cellular module, powered though an OBD port. I want to have to connected to the OBD port of a ...
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Truck's exhaust temperature: how to read EGT sensor by ODB / FMS / Can-bus?

I succesfully decoded can-bus data from a VW Caddy, but know nothing about OBD and trucks. For a research I need now to read a truck's exhaust temperature (EGT sensor), possibly by OBD. I would ...
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Why modern car networks are known as “unsafe”?

Engineers and tech people like Craig Smith (who made a great book about hacking cars) never stop warning about car security. Saying that modern cars ain't secure and can be hacked from the outside (...
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297 views

CAN BUS Renault

I am in the porcess of building an application which reads live telemetry data from the inbuilt car computer and sends it to Google Firebase for analysis and informational lookup on your phone and ...
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2answers
799 views

Are OBD-II PID codes the same for all car manufacturers?

In the Wikipedia PID list we can see that 0x0C for engine RPM, 0x0D vehicle speed, etc. Is this same for all car manufacturers? In Arduino examples we can see that data[2] reserves the PID (for ...
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3answers
519 views

Are there any affordable OEM scan tool options for DIY-ers? [closed]

Every scan tool I've seen offered to consumers only provides basic OBDII or CAN data. Some only offer the ability to view basic stored codes, and maybe a freeze-frame capability. This $20 scan tool ...
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Truck fleet monitoring project

I need to design a truck fleet monitoring system and make a prototype of it during my traineeship this year. I've been looking into the different buse networks that are already implemented in trucks ...
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1answer
2k views

Heavy Truck OBD2 diffrent from Car OBD2?

My problem: I try to read data’s from Heavy trucks(40Tonns) via OBD2. This is needed for a research project. I have already read many articles about OBD2 and interfaces for OBD2 like about the ELM ...
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1answer
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Sniffing the CANbus on an Audi A5

I've asked a similar question before: Connecting to car CANbus Unfortunately I haven't progressed much. The first product I tried was a CANLogger 2000, I got nowhere with it, so I sent it back. ...
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What happens if I shortcut the CANBUS?

It's a really simple question, but I found nothing about it on the internet. I was thinking on buying a CANBUS shield for my Arduino so that I can try to do some things on my car, but I am a bit ...
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BMW CAN bus data format

https://www.reddit.com/r/CANBus/comments/39pzpp/bmw_3series_2015_odometer_reading/ I am using the above website as reference and sending commands to engine ECU. I have a log from BMW engine ECU (below)...
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1answer
4k views

How to establish if a car has CAN Bus?

Can someone please help me on ways to establish if a car has a CAN Bus? I am specifically looking for? Physical or Technical/Electrical examination to check if its a CAN Bus I have read about ISO ...
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1answer
190 views

Connecting to car CANbus

I have a CANLogger 2000 and the correct supplier supplied ODB-II CANBus to 9 pin D-type cable. (http://www.csselectronics.com/screen/product/can-bus-logger-canlogger2000/language/en) The CANLogger ...
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2answers
942 views

How to simulate a vehicle CAN bus network?

I wish to do a project about CAN bus message testing, but without a real vehicle. Is there any way to simulate a virtual CAN bus network?
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1k views

Can I turn the steering wheel in Honda Civic 2017 (No Honda Sending) by sending commands via CAN bus (OBD ii port)?

I want to turn steering wheel my 2017 Honda Civic LX (without Honda Sensing) by sending commands via CAN bus (OBD ii port), My car has Electronic power steering. I am doing this because I need to some ...
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1answer
564 views

VAG TP 2.0 complete list of AT commands

I am trying to find DTCs from various ECUs in a Skoda Rapid 2009 model. I am using OBDLink SX (elm 327 chip) and Putty (similar to HyperTerminal) https://jazdw.net/tp20 This link gives the list of ...
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191 views

CAN bus motorcycle problem. Very weird!

I very much need your experience about CAN bus. My bike (Ducati) got a serious problem about CAN bus. The first time, my bike shows the "CAN line" error, dead totally on the street. I found the CAN ...
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1answer
3k views

OBD-II Mode and PIDs specifically used for Electric vehicles?

I am working on developing a vehicle CAN communications protocol being implemented in an electric vehicle. I was wondering if anyone knew if there is a standard MODE and PID for OBD-II messages ...
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2answers
506 views

OBD or CAN - what's mandatory (EU and US)

First of all, I've already tried to do my research and tried to get all the info I'm asking for myself (which obviously didn't work). I want to know if CAN or OBD(-II) are in fact mandatory in the US ...
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Controlling door lock/unlock via CAN bus

I'm trying to figure out how to lock and unlock the doors of a 2016 Mercedes Citan using the CAN bus via the OBD-II port. Is there some kind of OBD-II interface where I can control this with plain ...
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1answer
101 views

CAN-BUS only reading one repeating frame

I'm trying to read the CAN-BUS via the OBD port with a PiCAN, it works fine for one of our cars. But for the other (a 2007 Mini One) I'm just getting the same frame repeated until the bus is ...
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2k views

OBD2 CAN Protocol: ISO 15765-4

I understand that one of the CAN protocol that OBD2 uses to read vehicle data is ISO 15765-4. However this is the one that is used by generic OBD2 reader devices like ScanTool; And it provides a ...
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1answer
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In vehicle network

There are multiple in-vehicle network types: CAN, MOST, LIN... Do vehicles typically use only one of these or do they use a combination of networks types?
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Difference between FMS and OBD

What is the difference between FMS and OBD. Whether OBD is a standard or protocol. Recently I am working on a GPS device to tap the CAN bus in order to integrate with our fleet management system. In ...
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1answer
2k views

Is there a way to use a PC as an ECU for testing CANBUS Sniffer devices?

Is there a way to connect CANBUS sniffer device to a PC (computer) with CAN-H and CAN-L pairs and test the sniffer device? I want to convert my PC to an ECU emulator, connect a CANBUS sniffer device'...
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3answers
211 views

(Mandatory in the EU) CAN through OBD-II?

I know that in the US, since 2008 vehicles must have a CAN connection on the OBD-II plug, but what about Europe? Do vehicles have to add CAN to the OBD-II plug? Or is it possible to directly send ...
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2answers
2k views

Is it possible to access multiple CAN buses through the OBD-II port?

As usual I apologize if this has been asked and answered somewhere. I try to only ask questions if I can't find an answer or a satisfactory answer. From my understanding the OBD-II port on vehicles ...
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1answer
2k views

How is video transmitted in the car? (E.g., from backup camera to NAV display.)

Does video from the backup camera or side mirror camera travel to the (NAV) display via the CAN bus or some other mechanism? I'm really curious if you can get access in some way to that video - or ...
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3answers
4k views

Why are there multiple CAN buses in vehicles?

There are a number of questions on the CAN bus but none (so far as I can tell) that explain why there are several CAN buses in a vehicle. From what I understand many different nodes can be connected ...
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Difference between OBDII and CAN

What is CAN (controller area network)? What are the differences between an OBD-II protocol and a CAN setup?` How do I use an OBD-II scanner on a vehicle with CAN?
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1answer
925 views

How to control a car (accelerating, braking, steering) programmatically? [closed]

I would like to make a prototype autonomous car out of an off–the–shelf car (Toyota Yaris to be exact, but the instructions should be universal). One of the first steps is to get access to the on-...
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1answer
3k views

ATMA on OBDII not Working

I have successfully connected a terminal android app to the obd port of my car. And tried dry run of many at commands, many are working as expected. But ATMA (AT command to Monitor All) is not ...
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2answers
666 views

Computing Wheel Torque From Engine Torque

It seems possible to obtain engine torque and RPM from a truck CAN bus. I'd like to estimate tractive force at the wheels given these two values. How should I go about computing torque at the wheels? ...
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1answer
5k views

Is it possible to auto close the power window of a car using OBD and CAN bus?

I am not an electrical or automobile engineer, so pardon my ignorance. I found this product in the market to auto close power windows for certain brands. How can we send signals to the CAN bus using ...