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Discussion Starter #1
Hi All,
I've got a 2012 Compass Sport, 121k. Front bearings went bad and got the ABS, 4WD!, ESC lights on. Then would go into Limp Mode at 20 mph. So, I replaces both front bearings and sensor cables but it would still go into Limp Mode at 20 mph. Also, per a similar forum, replaced the Throttle Body. Reset the ETC, via battery disconnect, so it could relearn the sensors. Now it drives ok, no Limp Mode but all the warning lights are still on.
Does it have to go thru several drive cycles before it determines the sensors are good? If so, how many? Is there a drive cycle procedure?

Thanks for any info!
 

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At this point its time to get yourself some kind of scanner to read the exact trouble codes causing the lights to come on so you can zero in on the remaining problem, if any. There could be some codes that were set that will not clear on there own, so what you'd want to do is clear all current codes then drive it a while and see what codes (if any) come back, then go after those ones.

Code scanners are super cheap anymore. You can get a standalone unit with its own screen which is simple and easy to use usually, it will just give you a code most of the time but then you google that code and typically find all the info you need. The other option is a bluetooth/wifi version that connects to a smartphone and uses an app. Those are really cool but they can be slightly more complicated and problematic too when you are talking about the ones on the cheap end. If you are not super comfortable with electronics and using your smart phone then I'd suggest the standalone unit. Either way, make it sure can both READ and CLEAR codes. Some things read codes only or like with the bluetooth ones you can read codes but have to buy the app to clear them, etc.

If you really don't want to spend the 12-20 bucks on any type of scanner most parts stores will let you use theirs in their parking lot for free. Back when scanners were more like $100 and I lived close to an o'reilys I'd stop in there all the time with mine or my friends' cars to pull a code or whatever.

Just remember there are for real some types of codes that will not clear themselves. You can google that info if you don't believe me.
 

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Discussion Starter #4
Thanks arudlang and Labrador Cab. I do have an OBII scanner - Bafx Products - Wireless Bluetooth OBD2 / OBDII Diagnostic Car Scanner & Reader Tool for Android Devices. Thing is, trouble lights are on but I get no codes on the scan tool. I checked it on my Chevy Blazer and the scan tool works fine there. When I give it the clear command none of the readiness registers reset either even tho the real time tach seems to work. I've got a friend stopping by with his scan tool this weekend, but I'm starting to think the ECU is having issues. SMH
 

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Yeah sometimes that is the case where you have to have a scanner compatible with the special proprietary protocols used by the manufacturer to dig deeper into individual modules. A basic scanner often only reads the generic/universal stuff that all manufactures agree on, ABS stuff and reading from individual modules like the ECU or the TCM require both hardware and software support for whatever proprietary communication systems the brand uses.
 
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