Questions tagged [obd-ii]

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).

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368 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 ...
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1k 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 ...
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1answer
4k views

How can I make my ELM327 OBD-II secure?

My ODB-II (ELM327) device has the default PIN of 1234. Is it possible to change this PIN? And how?
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232 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?
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1k 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)...
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2answers
683 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 ...
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1k 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 ...
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374 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 ...
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1answer
4k 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 ...
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1answer
947 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 ...
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9k 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 ...
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97 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 ...
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1answer
324 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 ...
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2answers
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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2answers
4k 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 ...
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1answer
3k 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, ...
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1answer
579 views

Are fuel additives effective for DPF de-clogging

My car (Citroen C3 II) recently got its "DPF clogging" light on. As suggested in the manual, I have driven at lower gear / higher RPM for some time, and the light shut down. However, since I expect to ...
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1answer
674 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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2answers
4k 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, ...
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1answer
206 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 ...
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910 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 ...
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4k views

Why does my VW diagnostic codes give “Implausible Signal”?

I asked a question some time ago about a check light, specifically airbag and seatbelt light. I have since then checked the code with a code reader and removed it. Making the car drive without any ...
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2answers
1k 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, ...
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2answers
7k views

Is the Calibration Verification Number (CVN) unique

Is the Calibration Verification Number (CVN) unique across all cars?
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1k views

Unexplained Low LTFT on my Mazda cx7 2.3 turbocharged

So, it started when i got CEL with code p0172: system too rich bank1. I took the car to the mazda dealer, they said you need to replace MAF sensor. I agreed and got the new sensor installed. Now CEL ...
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1answer
237 views

Open source OBD II scanner hardware without ELM or STN

We have built an OBD-II scan tool using an STM32 microcontroller and it works for most vehicles. But occasionally our device fails to detect the OBD protocol, whereas the OBD scanner (ELM) will detect ...
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1answer
5k views

Calculate boost from MAP Sensor via OBD-II

I'm working on a little project where I want to calculate the boost pressure (in bar) which my turbo currently produces. I use a wifi OBD reader that I plug into my car. I saw mobile apps calculating ...
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203 views

Reverse engineer a scan tool to display what commands it sends [closed]

I came across this video: youtube.com/watch?v=VtMvccqE8ks Any idea/resources how to build this setup? I am not much interested in monitoring the CAN bus for commands (headers or CAN IDs) of power ...
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2answers
621 views

Can OBD2 devices send car alarm to a smartphone app?

I’m new about cars and would like to know if OBD2 devices like ELM327 are able to send the car alarm to a smartphone app, like Torque or OBD Car Doctor. So, instead of the car alarm making noise, the ...
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1answer
39k views

OBD II Scanner refuses to communicate with the vehicle!

All the fuses check out All the relays check out Could I have a faulty ignition switch? Or an open somewhere? How do I go about troubleshooting this? It cycles through all the protocols, finds ...
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2answers
18k views

What does it take to program a used ECU?

I own a Mazda MPV 2000 with a faulty ECU. The vehicle has an immobilizer. It will not start with the former ECU. It floods the engine with fuel. After extensive diagnostics on the vehicle and the ...
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1answer
149 views

Pending overheating related OBD codes disappear before becoming stored?

If my car has overheating/coolant problems, but no check engine light, is it possible that there are pending codes which haven't became stored yet because I keep refilling the coolant before the ...
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1answer
2k views

Seat belt / airbag light ON polo 2013

Hello I have a polo from 2013. I just inherited it from my grandfather, whom has not driven it that much. Most of the time it has been in garage. Only done 28.000 km After I got it a lamp started ...
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10answers
17k views

Is it safe to get power from OBD 2 port for dash cam?

Most dash cams don't have a large enough battery to record while the vehicle is off so most people recommend using an external power bank. However, to my understanding, most power banks with enough ...
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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
179 views

How can I analyze my Acura TL's response to low octane gasoline?

My six-cylinder 2008 Acura TL specifies "premium" fuel. My wife often fills it with "regular" (i.e., 87 octane). As I understand it, under certain operating conditions and loads, the lower-octane ...
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2answers
591 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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1answer
458 views

Where can I get a comprehensive list of GMLAN Symptom category codes?

GM and several other manufacturers have added additional information to the 5 digit codes. These are not “codes” but are “Symptom categories”. The DTC symptom is made up of an additional 2 digit ...
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642 views

Read vehicle speed from Isuzu D-Max 2015

I'm using an OBD reader with Elm327 v1.5 chip. I have made a software that reads vehicle speed (pid 010d). This software works ok on VW Transporter and some other cars but not on Isuzu D-max MY 2013-> ...
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1answer
232 views

OBD2 Mode 1 PID 12

What are the meanings of the returned values for OBD2 Mode 1 PID 12? One source shows me A0 Upstream of catalytic converter A1 Downstream of catalytic converter A2 From the outside ...
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2answers
5k views

2003 Honda Accord Crank But no start

I did something really silly last night :( - I have a 03 Accord V6 sedan that I recently changed the transmission. After I hooked up the new tranny etc.. I noticed when I start the car the SRS, (!) ...
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6answers
26k views

Can retail OBDII scanners “kill” my car's ECU?

I have a run of the mill OBDII scanner from Amazon. I connect it to my phone's (Android) app, Torque PRO, via Bluetooth. I have been using it for 22-months. No problems whatsoever. My car never ...
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3answers
12k views

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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0answers
101 views

adapter for ODB2 device

i have a car: "fiat punto street 2016". I just bought a device from ebay that can give me some informations and errors status, the problems is that the device has an interface OBD2 and it's ...
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135 views

Need to read OBD-II steering angle PID on 2009 Toyota Camry [duplicate]

My graduation project is about developing the car side mirror. And for that purpose I need some data from my 2009 Toyota Camry. I have searched for the PID's (parameter ID's) for some sensors, but I ...
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0answers
614 views

Catalyst Temperature

Please refer to Catalyst Temperature PIDs (mode 01 pids 3C, 3D, 3E, 3F) for the following questions - https://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_01 Q1. Is there a thumb rule that the catalyst ...
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0answers
726 views

Calculate Intake Manifold Absolute Pressure from MAF Engine using OBD Data

I need to calculate Intake Manifold Absolute Pressure from OBD Data. I have Toyota Corolla GLI 2010 Model. This car has MAF engine which does not return Intake Manifold Absolute Pressure. Where'as I ...
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1answer
1k views

Calculate vehicle range using OBD-II data

Is there a way that I can calculate the current range of a vehicle, using data provided via OBD-II? I know I can find out the fuel percentage using fuelLevelInput, but how can I find out how many ...
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2answers
4k views

Can a check engine light reset itself when a scan tool is connected?

I have a Toyota RAV4 2002 4WD. I was driving to the car wash when suddenly the check engine light come on when I accelerated hard. After the wash, it still was on. I drove home, shut it off, turn it ...
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0answers
50 views

Less than specified bytes of data from OBD

0100 (https://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_1_PID_00) should provide 4 bytes of data. But there has been cases, like Audi A4 2.0 TDI, where the data from 0100 was less than 4 bytes. So is the ...