Modern cars have MASSIVE digital displays, loads of computers systems monitoring every subsystem and internal diagnostics running to the OBDII ports.
Why the hell can’t we get diagnostic feeds on our console or infotainment center?
I’m not aware of any car manufacturers selling their own diagnostic ASICs, so it’s not an extra margin to squeeze afaik…
What gives? Any insight into this beyond the usual muh corporate profits conjecture?
Why don’t all computers have everything digital ever made? https://en.wikipedia.org/wiki/Artificial_scarcity
Because FUCK YOU. That’s why.
Car companies want you to go back to the dealership to have codes read. They had to be sued into releasing the code’s meanings so independent shops and owners could do their own repairs.
Even though most car owners are knuckle draggers who don’t understand oil changes or air filter changes, they don’t want to make it any easier to do repairs outside of dealerships. I know someone who swears by dealerships and was very confused when I asked if he ever changed the air filter to improve fuel economy. For some reason, he thought his car didn’t have one.
“Fuck you. Give us money” - BMW (probably)
Ironically, BMWs do or at least used to, have diagnostic functionality in their infotainment centers. It wouldn’t go very deep, but it was more informative than “lol engine bad visit workshop”. It’d still tell you to visit the workshop, but it’d also tell you why.
No, you’re thinking of Mercedes, this is BMW so you have to buy the ‘fuck you’ subscription, just a monthly 15€, to get that amount of response from them.
That subscription is only available for customers who have bought the “car seat heat ON”, “car seat heat OFF”, “AC direction control with an optional AC temperature control upgrade”, AND the “rear mirror defrost” subscriptions … as well as having less than 20000km on the odometer, past 20k km the subscription is 20€ and requires the “advanced oil leak detection system” subscription (it’s just a light on the dash to remind you to casually look where you parked for oil spots)
Fuck BMW, let me have an Opel Kadett instead
If they wanted you to have that info, the software that powers the code reader would already be in the cars computer and would show human readable errors.
They don’t
They want you to go to the dealership…
The only reason you can read the codes at all is because of regulation… For now thanks Trump
Surprisingly, Teslas actually do. You have to access a hidden menu, but it’s well documented and easy to do.
Until you fail to pay your subscription fee and Elmo autopilots you off a cliff.
Damn, Donald duck and Elmo duo
Car manufacturers aren’t required to document how to repair “infotainment centers” because they aren’t critical to the operation of a car. Making them more useful might require a car manufacturer to spend more money by allowing more requirements to be imposed upon them.
They don’t want to maintain the software for it.
Also, they simply don’t want you to know. Especially if the whole setup is already a patchwork of sensors that barely work together in the first place. It might cause unnecessary questions, concerns or even liabilities.
A lot of it is useless anyway as long as the car is not broken, and if it is broken, the sensor might be broken too. It’s meant for diagnostics only.
They don’t want to maintain the software for it.
That’s fine, I just want the error codes displayed on the existing screens. No software necessary for that. Maybe a simple script at worst…
Also, they simply don’t want you to know.
They want it to be known, otherwise there wouldn’t be fail codes output to the OBDII port…
It’s meant for diagnostics only.
Yes. Why don’t they display diagnostics error codes on the existing displays? I’m fine with special display modes and “secret” menu options.
They want it to be known, otherwise there wouldn’t be fail codes output to the OBDII port…
That’s only there because it’s required by law since 1996, and only a small subset of those codes are actually standardized/required. Many of them are specific to vehicle manufacturer and are only known to the public due to leaked documentation.
Auto corporations don’t want you to easily have diagnostic info beyond the most basic things (tire pressure for example), they want you to bring it back to them. They don’t profit off you fixing it yourself.
The same reason they won’t let you buy the dealership scan software for under 10k. Almost every maker has an in house scanner and due to standards they only need to provide certain data to non dealer level tools and I believe the standard only exists for gas powered vehicles that need to provide OBD2 data. Plenty of makers (BMW is horrible about this) stuff away data where a normal obd scanner just won’t access and it’s gotten much worse with the overuse of CANBus (I sure love when my trunk lid sensor prevents my fucking car from starting).
Thats where your snapon and other third party scanners start bringing a gap, but even those are extremely pricey and need to be updated constantly and even those usually won’t do EVERYTHING.
Fwiw the cheapest and best way I’ve found is basically to pirate the dealer software and get a compatible knockoff scanner (vxdiag for example). I have Ford IDS and a couple others this way but assume that the software is gonna install something malicious and dedicate an old Thinkpad or something to it.
Depending on the age of your vehicle something like Torque Pro is extremely useful. I have mine monitoring transmission temp, long and short term fuel trims, O2 sensor signals, voltage, mass air speed, intake temp. It’s more than enough data to see something coming long before it becomes an issue.
If you have a Ford, there’s free software called Forscan that will perform all of the duties of the dealer service software. I used it when I replaced my wife’s ABS module on her Edge. You can even use it to program keys and modify things.
Yep FORScan let me set the VIN on an electronic power steering rack (because that’s totally cool to require so you can’t just replace it at home right?).
I beleive it is actually IDS just reverse engineered and more accessible, unfortunately not every maker has one of those out there it really should be legally required when you buy the car to at least get the software to “own” it.
Yeah I was so psyched when I came across it while trying to diagnose the ABS issue. I searched for something similar for Toyota and Chevy for our other cars but was bummed that nothing like it exists for either one.
Who is going to look at that stuff apart from technicians? Most users have no clue how the functionality of their vehicle is achieved and they don’t care.
For argument’s sake, let’s assume there is a userbase for this type of information. It would be possible to show diagnostic information like DTC or run DID routines from the dashboard but this is already possible from any cheap offboard tester, via a phone app or laptop.
The reality is that even if an OEM wanted to provide detailed diagnostic information, they don’t know it either because the information isn’t disclosed by their supply chain. Companies such as Bosch, who supply brake ECU, are extremely tight lipped about their intellectual property. When something goes wrong we use a special development version of the ECU to record the associated software variables during the fault and present that as evidence but we don’t have access to the source code.
Modern products are not designed to be repaired. They want us to continually buy new shit. Basically anything with software in it is an absolute nightmare to maintain. It makes me depressed just thinking about what a clusterfuck this landscape is.
Source: control system engineer for a large OEM.
Who is going to look at that stuff apart from technicians?
Anyone who owns expensive equipment and is serious about true ownership including all possible maintenance and repairs. Hi, I’m the guy who would be looking at it if it was visible without shitty dongles or 5-figure ASICs.
Tell your employer they could have share prices doing numbers if they did the slightest bit of QOL improvements for anyone remotely like me.
Pleased to meet you. I am also one of those people. We’re a rare breed 😂
I mean, I don’t think they’re taking about a full diagnostic. Just the code associated with a CEL.
It’d be nice if you could read the code from the dashboard or infotainment without digging out a code reader.
And it’d be even better if they had human readable descriptions for those codes, especially for OEM specific codes.For most people, a CEL is all you really need. But sometimes and for some people, just telling them the problem would be super helpful.
For example, a loose gas cap is a CEL. Save people $100 at the mechanic if it was just like “check that your gas cap is tight”When I’ve queried DTC using a cheap scan tool it’s usually resolved the important (as in emission relevant) DTC information text and most of the non engine stuff. In order to create a DTC there usually is a customer recognisable fault or an implication for emissions performance.
Many of the DTC are spurious and would only serve to confuse the user. As a system integrator, I’m personally responsible for creating tens of thousands of spurious DTC (in a vehicle population of ~100k) and I have to periodically report to management what has been done to reduce that number. The funny bit is when I found the root cause the management completely lost interest in solving the problem because, money 😂
I’m with you though, there’s no such thing as too much information. I want to know how my car is doing and fix the problems. Most people in the business do not care and our users are ignorant and apathetic, that’s why we can’t have nice things.
Hell cars have flash codes. I used to have a Holden commodore bridge out two pins in the obd connector and it would flash codes on the check engine light.
I’m sure cars can still achieve this easily enough.
But again useless information to the masses. I’m a crane technician and used to work for a large OEM and even we we pulled DTC codes down often they were little to no help
We could have had readable diagnostics since they started showing multiple items on the in-dash LCDs. It’s always money.
Even OBD1 cars had that in the form of a blinking check engine light.
Shit, it works for my furnace 😅
Our 85 Thunderbird used to blink a set of numbers out. But you still had to have some type of information to make use of it
As someone pointed out on the comment, one of the reason is Money, the other one is safety and security
based on Vehicle manufacturer claim.Yet, nobody can stop you to sniff and monitor your own car CAN/OBD2 interface using as simple as cheap microcontroller and compatible OBD2 interface kit (e.g CAN Transceiver/Controller kit).
EDIT: So far this curated list helpful to me for CAN bus based protocol.
The sad answer is that those displays exist to cut costs, not to make your ownership experience better.
Also the dealers want you to come to them for that CEL, and the companies don’t want to piss off the dealers.
They make the ownership experience worse. I fucking hate mine.
I wish I could replace half of the real estate with buttons and.knobs but nooooo, I can’t afford a car with such fancy craftsmanship so it’s a cheap shitty screen with a cheap shitty OS instead. And everyone things it’s fancy…LOL
I like my Infiniti because it has both a screen and knobs / buttons
As does my ram
Nice! I’m glad other brands are still sane. Nissan is moving towards all-screen and I think that’s my cue to leave them.
Iirc there was a push on manufacturers from the NHTSA to return to physical controls for things like HVAC and media due to safety concerns, but I don’t know how official that was.
Just to throw this out there, but car dealership owners are close to the scummiest people on the planet.
Yes
My spouse used to work in the industry. I can confirm your take with first hand experience 😮💨
They don’t call them Stealerships for nothing.
Why don’t the companies want to piss off the dealers? Is some Toyota dealership really gonna stop selling Toyotas because a Toyota comes out with a self-diagnosis feature?
Dealerships do a lot of absorption of supply and demand elasticity on behalf of the manufacturer. It’s a symbiotic relationship.
The dealers have a shocking amount of power in the US
And most of their money comes from parts and service.
I’m not aware of any car manufacturers selling their own diagnostic ASICs, so it’s not an extra margin to squeeze afaik…
What? The errors are intentionally vague so the drivers are forced to go to a dealer, giving them a chance to lie and pretend that’s something very serious and very expensive, while all they’re going to do is a reseat of a cable and a error reset
Btw Car scanner supports showing obd data on Android auto. It’s a game changer for hypermilers
I disagree… Error codes from the OBD port are usually system-specific. They make troubleshooting very easy if you use online resources… I just want a quick readout on the included hardware.
Not a fan of dongles and such. I own a few different ‘Amazon specials’ and the UI feels like hot garbage (given I use them maybe 1-2x a year at most).
Error codes are system specific but I mean their own dashboard just says “engine error” and not even "error 943” which you can search by yourself
The name sounds like my phone is going to wake up in a bathtub full of ice and missing a camera module, but Car Scanner is legit.
I think it’s more that the protocol is universal across the industry even though engines are all built somewhat differently, so you can only have a generic code to tell you what’s wrong.
I mean the errors that are shown on the car dashboard. If it’s an error about the lambda sensor, it will just say “engine error, please contact dealer” or something like that
Money
I don’t know if that’s the reason but it probably is
I’m guessing government regulation.
This feature is a no-brainer. Whenever there’s a feature the market would love (and hence pay for) the reason it isn’t there is the government doesn’t allow it.
It’s almost always the reverse.
Regulation is what forced manufacturers to provide standard error codes over a standard protocol using a standard socket, so that people could self diagnose their car problems without getting locked into their dealership mechanic
Teslas do. https://youtu.be/fVWfmvgDtaY
