Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
Join us in building a kind, collaborative learning community via our updated Code of Conduct.

On-Board Diagnostics-II (OBD-II). Questions usually involve scan tools, their use and their compatibility, as well as how to interpret Diagnostic Trouble Codes (DTCs).

1
vote
0answers
8 views

Can I use a BMW round 20 pin to OBD II adapter with a OBD II scanner?

I'm looking to buy an e30 or e36 BMW and 99% of those don't have an OBD II port because they were made prior to 1996 but they all have the BMW round 20 pin I believe. I came across this adapter:and I ...
0
votes
1answer
18 views

Accident Detection, Tow Alert, Level of Car, VIN, Fuel Level Input, Ignition Control using ELM-327 OBD-II

We are building a mobile application for vehicle diagnostics. We are using the ELM327 OBD-II tool for fetching the data from the car using Nodejs. The application is being built and we are facing some ...
0
votes
1answer
27 views

High rpm on neutral but flatting the gas pedal on D doesn't increase the rpm

I am making this question as an update to my previous question . I am not sure if updating that question will draw attention to it or keep it buried in the sea of questions here, if it gets updated ...
0
votes
1answer
31 views

Honda Odyssey (2002) proper troubleshooting of code p1751

Code is accompanied by rough shifting when cold. If I drive hard when its cold it will go into limp mode. If I take it nice and easy until its good and hot it seems to shift fine. I've been searching ...
1
vote
1answer
9 views

Which value should takes to show Gauge value, Fuel pressure or Intake Manifold Pressure?

Currently, I'm working on an app which should show Gauge value (inHg) of the vehicle using OBD reader. Which values should I use to show the Gauge? Is there any formula?
2
votes
1answer
42 views

P0380 OBD-II Trouble Code: Glow Plug/Heater Circuit “A”

I found the following error in the error log of my Ford Focus Tunier 1.6 tcdi diesel 109HP (2006): P0380 OBD-II Trouble Code: Glow Plug/Heater Circuit “A” First i thought it was due to a defect ...
0
votes
1answer
46 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 ...
1
vote
1answer
65 views

After odometer/mileage correction, which module data gets changed - engine or instrument cluster?

I read that the PCM tracks mileage for it's own purpose and BCM tracks and stores it for instrument cluster module to display it. So, when someone does an odometer/mileage correction, does it change ...
3
votes
1answer
38 views

Does obd scanner remove check engine light only or doers it also removes unfixed codes from memory?

If you use an obd reader to to delete the check engine light for a problem which hasnt been fixed, the check engine light will eventually come back on. My question is, regarding the code that is on ...
2
votes
1answer
21 views

Is there a reason to monitor calculated (not measured) OBDII mode $01 catalyst temperature values?

My assumption is that on a 2 bank system, if both catalyst always read the exact same temperature, the values are calculated or inferred from other sensor inputs. My guinea pig is a 2005 Ford ...
0
votes
0answers
23 views

OBD several errors big picture

I have a proton wira 2004 which is essentially a Mitsubishi Colt, I got these errors when I connected an OBD2 device. Could anyone tell me the big picture, what do they mean combined? Thanks in ...
0
votes
2answers
84 views

Is obd code P0133 anything to worry about?

The day before I got this obd code I changed clutch and gear box oil. 15 minutes before I got this code one of my brakes pads completely wore out. I read a bit about the code and I guess they are not ...
1
vote
1answer
40 views

Ca. Smog Test Problem

I took My 2000 Dodge Durango 4.7 engine to get it smog tested in Ca. The tester tried at least 3 times to communicate with my OBD syst. with no success. He then took my truck off the machine and ran ...
1
vote
1answer
190 views

Calculating current fuel level with obd data

My car does not provide the fuel level data to the obd. this is the data the car do provide: engine coolant temperature, engine load, ambient air temperature, engine rpm, intake manifold pressure, air ...
2
votes
1answer
32 views

My 2008 Miata only has 3,600 miles on it but failed the smog test

2 OBDII monitors (evap system, and EGR and/or VVT system) have not yet finished self-checks, apparently because the battery was replaced. The smog station says I need to drive the car about 75 miles ...
4
votes
1answer
517 views

Decoding VW Airbag DTC from elm327

I am using PuTTY (similar to HyperTerminal) and elm 327 (OBD Link LX) on my VW Polo 2015 model to read Airbag DTCs. Command sent: AT SH 715 Received: OK Command sent: AT CRA 77F ...
5
votes
2answers
978 views

OBD-II difference between signal ground and chassis ground

Am planning to install a carputer (Raspberry Pi) in a 2005 Ford Mondeo, replacing the car stereo. The Quadlock connector to the stereo apparently includes CAN bus, so I am thinking I will get a USB ...
1
vote
1answer
246 views

Can i control the brakes of a car by the OBD II Interface?

I'm doing a senior project about automating the braking system in cars and make it smarter
2
votes
2answers
459 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 ...
1
vote
3answers
175 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 ...
1
vote
0answers
46 views

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 ...
3
votes
2answers
69 views

Developing an OBD2 application - Engine Warning Lights

I am currently developing an application which retrieves diagnostic trouble codes from my car's OBD system and display any DTCs in a list. However, as my car has no trouble codes I am unable to test ...
3
votes
1answer
444 views

BMW - Reading fault code without OBD reader

OK - this is frustrating. It was dead simple to read the error code on my old 323i using the button on the stalk. I recently bought a 2014 328i xDrive and for the life of me cannot find a way to ...
3
votes
3answers
270 views

What data are logged, at which frequency, and what is the size of the log?

Is there a way, for a given car model, without physical access to a car of this exact model, to find what data are logged, what is the frequency at which they are logged, what the size of the log is, ...
1
vote
2answers
240 views

OBD2 mode 3 wrong response

I'm a research engineer working on OBD2 scanner, I'm using ELM327 v1.5 interface to communicate with cars. I used Dacia Logan 2013 (French car) to test OBD2 modes, the MIL indicator was ON. When I ...
1
vote
0answers
40 views

Android OBD2 Fuel

Currently I'm developing an Android app that uses an OBD2 ELM327 device to read some data from the car, so I could use it in my application. Now, when I want to read the fuel, fuel consumption or ...
1
vote
0answers
174 views

Cars with single fuel type how retrieve tank level to dashboard?

I see that BiFuel cars had fuel level and type readable from ECU by using pid 0151 and 012F. Cars with monofuel don't have this pids sensors, so how the dashboard retrive the fuel level? Maybe the ...
1
vote
2answers
609 views

OBD-II Fuel type and level of Monofuel Cars

I'm making an application like Torque and i have some issues with commands of Fuel Type and Fuel level with cars that use only one type of fuel like, Only Diesel or only gasoline. With car Bifuel ...
0
votes
0answers
47 views

obd2 device features

I would like an ('interactive'?) OBD reader/controller that could do things like run an EVAP test or control the ABS for brake bleeding. If it could turn individual outputs on/off (eg: the canister ...
0
votes
1answer
87 views

Where can i find official scientific documents with table of PIDs for ECU

I need an official document for reading information from PIDs that manage comunication with ECU of car. I'm searching to sae.org and iso.org but i don't find nothing. Can someone guide me?
3
votes
0answers
523 views

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)...
4
votes
2answers
419 views

Measuring Honking through OBD

This is probably too simple question for this forum but would appreciate your help anyways. I was wondering if I buy and connect a OBD port to my car and is successful in collecting data, would there ...
1
vote
0answers
363 views

OBD request trouble code mode 3 and mode 7

I'm trying to get my own app on phone to read Trouble code in car... I see that i have 3 mode to do this... first is to use the mode 01 with command 01 (but this command is generic) or the mode 03 and ...
0
votes
0answers
108 views

Does limiting the number of PIDs on an OBDII Live Scan increase the sampling rate?

I was messing around with the live scan settings on my BlueDriver OBDII scanner and I checked another PID box and got this message: To provide the best quality of data, we recommend logging no more ...
3
votes
1answer
1k views

can elm327 (bluetooth,wifi) adapters read and clear airbag(srs) codes?

There are a lot of bluetooth and wifi obd adapters but only a handful of them(e.g blurdriver) claim that they can read and clear abs and srs codes, so I'm wondering whether a cheap elm327 based ...
4
votes
1answer
376 views

Can the OBD port be used to disable the car alarm?

My car alarm (2007 Mercury Mariner) has been going off uncontrollably at all hours and my neighbors are furious. I cannot afford to take it to the dealer, who wants hundreds of dollars to even look at ...
5
votes
2answers
2k views

How read/calculate the amount of consumed fuel estimated for a travel?

I read some Question like that but the best that i found is to fill the tank and read how many km you can do with that tank and register it. But i'm developing an application that read information ...
0
votes
0answers
252 views

Can we access steering torque of Honda Civic via OBD ii port?

I have panda (Comma.ai) OBD dongle that can interpret all data via busses exposed in OBD ii port, I could get the steering wheel angle data but couldn't find the data packets for Steering wheel torque....
0
votes
0answers
38 views

Is it possible to produce Fuel Efficiency graph using OBD2 app

Can the Torque app be used to produce a Fuel Efficiency graph for my car, or do I need a specialist for this kind of information ? Generally I want to measure the most fuel efficient extra-urban ...
0
votes
0answers
276 views

Mahindra Scorpio OBD codes means

I have Mahindra Scorpio crde 2007 model, I have a problem with it, while I was driving yesterday to my home ECU light glows in my cars instrumentation cluster and after 10-15 seconds the car ...
1
vote
1answer
133 views

1995 VW Eurovan OBD I to OBD II adapter

My 1995 Eurovan has a check engine light coming on. I have a standard OBD II reader but this vehicle requires a OBD I reader. I see they sell OBD I to OBD II adapters online but I have read that with ...
1
vote
1answer
573 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 ...
2
votes
2answers
862 views

Volvo S40: Identify cause of alarm triggering

2005 Volvo S40 with about 100k kms. Every once in a while, usually after I've just parked the car, exited, and locked it, the alarm will go off. I understand there is a common issue with these ...
3
votes
1answer
723 views

Is it possible to check ABS, ESP and Airbag data from obd port?

I'm developing an app that read data from car via OBD port. I'm not expert with this port and i would like to know which type of data i can read from this port. For sure i can read speed, rpm, ...
1
vote
0answers
307 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 ...
2
votes
2answers
643 views

Classifying a DTC as active, past or potential

Scantools always classify a DTC as active/current, history/past, potential/memory. How do they classify that? Sample raw data: 80 F1 5A 05 58 01 C1 00 20 0A Can you help classify it as past, ...
0
votes
0answers
74 views

Not receiving multi line response ELM 327

I am sending the following commands to my Hyundai i20 2012 model (OBDLink SX Bluetooth device): AT Z AT H1 AT L1 AT S1 AT AL AT SP6 AT SH 7D1 18 00 FF 00 The response I am getting is 7D9 10 0B 58 03 ...
1
vote
0answers
318 views

Recalibrating speedometer over OBD-II

Is it usually possible to adjust the deliberate lying of the speedometer? My Renault Twingo reads about 5% too much, but the odometer is spot on, so the computer knows the right speed. Also, we're ...
4
votes
2answers
280 views

How can I rev a “drive by wire” car from under the hood?

I've got a 2013 Hyundai Accent with a noise coming from somewhere under the hood. Happens only at a fairly narrow band of engine speed (1100-1200 RPM). I've been trying to hunt around for the source, ...
0
votes
2answers
2k views

Is the Calibration Verification Number (CVN) unique

Is the Calibration Verification Number (CVN) unique across all cars?