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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What is the maximum number of OBD2 PIDs I can reasonably retrieve at the same time?

I have Mazda 5, 2014 recently I've got OBD2 logger which allows to retrieve large amount (several hundred) of PIDs, including standard ones (SAE) and specific PIDs provided by Mazda Enhanced Add-on; ...
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Is it required to claim an address with J1939?

I'm working on an ECU from a car engine. When powering the ECU I get a J1939 NAME message. I was wondering do I have to do the same by sending an address claim with my nodes NAME or not? The reason I'...
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Remote start and Cool down ford F150 2015: possible by interfacing with ODBii?

I'm trying to set remote starter and cool down (Air conditioning), of my Ford f150 2015... I have done an initial reserarch and it seems possible (I have found a company called Start x https://...
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Jeep CanBus Lock/Unlock new duplicate door latch

I have an 07 Jeep Grand Cherokee CRD. I have a rear bumper mounted tire carrier that I would like to repurpose an extra door latch to secure the tire carrier closed. Is it possible to piggy back on ...
LevisJeanz's user avatar
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Hoping to get rid of "no message" CAN error that even BMW engineers in Munich cannot/will not solve

I have one persistent info error remaining on my BMW F30 that my OCD won't let go. BMW also threw in the towel on this as described in this NHTSA bulletin: https://static.nhtsa.gov/odi/tsbs/2013/MC-...
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2012 nissan pathfinder/no start no crank

hello all and thank you for reading. I am working on a friends 2012 Nissan pathfinder that his mechanic gave up on after throwing some parts at it and not fixing it. scanned it and its throwing a ...
Aleko Lampas's user avatar
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Can I send a PID using CANBus fornat through an OBD2 bluetooth adapter?

I am interested in knowing if, by sending certain AT commands to the OBD2 Bluettoth adapter (for example the generic ELM 327 Mini) I can "program" this adapter and thus be able to send the ...
José Cohen's user avatar
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CAN bus protocol to command/control fuel pump relay off

I am trying to capture the CAN bus frame responsible for turning off the fuel pump relay. I have an OEM scanner which commands the fuel pump relay off, and I capture all CAN frames during that time. ...
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Flow Control for Multiline Responses for Custom 15765-4 CAN messages over ELM327

I am using an ELM327 adapter to talk to the OBD2 port on my car over ISO 15765-4 11b/500k. I want to query for non-standard messages outside of standard OBD2 PIDs, (which I have separately logged from ...
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Should the car factory be responsible for their CAN dbc?

Which side should be responsible for a correct CAN dbc ? Developer or car factory ? Here is the problem I met: The car factory provided both CAN matrix and CAN dbc, unfortunately the CAN dbc , when ...
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Why does this CAN message mean? It is the only one I get

I am trying to reverse engineer my Lexus ES250 using an Arduino-based CAN sniffer. The connection seems to be OK as I am reading messages, but all I get are the two CAN messages bellow, looping ...
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Help understanding CAN-bus signals to control camera module

Replaced car head unit with carplay (2011 Range Rover L322) and everything works except rearview camera. The input on the head unit works but the car doesn't send video signal when needed. Here is the ...
MikeV's user avatar
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How does OBD2 work with CAN?

I understand how CAN works (I think). Good info here if you would like to see: Difference between OBDII and CAN So very briefly, there are multiple modules and each module posts interesting data on ...
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How do I decode BMW CAN data (over OBDII)

I'm using an ELM327 type device. I'm trying to poll and decode data on my BMW i3. I'm using some of these resources as a reference: This post breaks down the init I need to do. This further post ...
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Can an "e-shock e-lean" transducer be fitted to a non-CAN-Bus equipped motor-cycle?

I would like to add an "e-shock" "e-lean" (https://www.e-shock.it/products-item/e-lean-advanced/) inclinometer to a motorcycle which may not be equipped with CAN-BUS ECU. For a ...
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Significance of 7E8

I am new to the field of automotive electronics and am currently trying to understand the working of the CAN bus. I understand that when we connect a CAN bus logger to the OBD2 port in a car we will ...
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Cannot connect to gateway node of CAN bus through OBD2 port

I wanna connect to can bus of my car. I read in the manuals that obd2 is hooked to high speed can bus of something called CCU node and this CCU node acts as gateway between HS and LS canbus. When i ...
Safa Seed's user avatar
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CAN Bus Off DTCs and Parasitic Draw

Working on my 2010 Fiat Ducato 250 series. I have a parasitic draw of around 200ma. There are two codes which won't go away, U1602 CAN Line, Bus Off Intermittent in the Marelli Instrument Cluster, ...
Robert S. Barnes's user avatar
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2009 Volkswagen Jetta TDI diesel 2.0L

I have 2009 Volkswagen Jetta TDI diesel 2.0L, they saying this car required CAN bus system instead kwp2000. My question is: How does the protocol Id change? Maybe ECU is defective? Some people told me ...
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Need Help Designing A Servo Mount To Turn The Steering Wheel on a Nissan Rogue [closed]

I have a 2014 Nissan Rogue with a broken CVT, so rather than trade it in, I want to use it a test bed for some autonomous driving software. It has a good steering angle sensor, and I already captured ...
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About heavy-duty vehicle diagnostic port

I am trying to design an ELD device that could be connected to the deutsche 9 pin and 6 pin port on heavy-duty vehicles. Is there any place where I can get the pinout configuration of these ports for ...
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P0101 and P2113 codes removal Kia Rio 2011

I have a KIA Rio Diesel car from 2011. With a diagnostic tool I have read the P0101 and P2113 DTC's: I had an old and problematic throttle body. I have replaced it with a completely new one and took ...
Łukasz Przeniosło's user avatar
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Volvo - send commands to read DTCs

I tried finding out the commands a diagnostic tool sends to my Volvo and I got this - 1D D0 16 16 03 22 F1 86 Protocol - CAN 29/500 (elm command: AT SP 7) Can someone help me with the method to ...
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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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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 ...
user46860's user avatar
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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: ...
Soumya Sen's user avatar
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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 ...
user45530's user avatar
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2 answers
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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 ...
Luza's user avatar
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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 ...
Karsten Breivik's user avatar
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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
Young4844's user avatar
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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 ...
reheiser's user avatar
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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 ...
Rob's user avatar
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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 ...
Tareq Sulaiman's user avatar
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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, ...
ElectronicsNewbie's user avatar
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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 ...
Pierre C's user avatar
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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 ...
Alex Poca's user avatar
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4 votes
1 answer
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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 (...
Lawris's user avatar
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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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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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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 ...
Yazly's user avatar
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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 ...
Lanard's user avatar
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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. ...
SPlatten's user avatar
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2 answers
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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 ...
Fusseldieb's user avatar
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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)...
Soumya Sen's user avatar
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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 ...
Youbaraj Sharma's user avatar
2 votes
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601 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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