2020 Prime shows Check Engine but cheap OBDII says "no codes".

Do I need a better ($$$) OBDII reader?

Recently had 12v batt go low for no real reason (left lights on a few months ago for like 15 minutes, had to get jump, then didn't leave anything on but next morning got a Low Battery, and also a "Error in lane assistant" but that went away after a drive and restart.

Car has about 97,000, still on 1st factory set of plugs, brake pads, etc. Only changed oil, coolant, ATF, oil and air filters. This is first time Check Engine has come on.

Also has "see dealer for service" which I guess is just oil change reminder.

Any way to dig into system from dash video screen to see what Check Engine is all about?

 

thx, ordered. But I'm a bit miffed that a Govt mandated system like OBD II doesn't require that The System can't at least spit out codes to a basic OBD II reader, and in this day of EVERY car having a computer screen on the dash, doesn't give codes and likely meaning, with I guess a few legal CYA about "don't try this at home, go to dealer".

 

thx, it also flashed something about "lane assist error" but that went away, and now the Check Engine light is also off.
Autel AP200 shows "faults" but not codes. Can I get more specific CODES for this stuff out of Autel AP200?

2 ABS/VSC/TRAC Fault | 1
14 LKA/LDA Fault | 1
16 Air conditioner Fault | 1
26 HI autoleveling Fault | 1
27 Smart key Fault | 2
28 Power source Control Fault | 1
30 Navigation system Fault | 3

Don't know what LKA/LDA mean "lane departure assist" ??? Don't know "HI autoleveling".

Everything seems fine and car drive perfect.

I'm thinking (praying) all this was caused by my Low 12V event, and just stayed in system as "flags", but all I need to do is hit "Quick erase" on my Autel Ap200 and everything SHOULD clear and stay cleared, until next time I run the 12V low. Seems like this is all stuff that is pretty much 12V systems. Haven't "torture tested" the ABS/VSC/TRAC, and not even sure what a failed TRAC would feel like.

Should I hit "Quick erase" and then check in a day after some driving?

I've got the basic "LE" model and don't use any of the onboard Nav, etc.

 

I once blew out a $2000 Cat Converter on a big Chevy Van due to driving with a plug wire that got fired on the exhaust manifold. Kept driving the thing for far too long before fixing. So I'm once bit and twice shy about any CEL.

 

got Autel to kick out actual codes:

examples:
TCS/ABS etc C1247 "Hi or Low power volts"

A/C U0163 "Lost Communication with Navigation Control Module" (Wth does A/C need to talk to "NCM"?)

But all sounds like related to my low 12V event.

Try to erase but Autel asks me "Is ignition on and engine off?" but how does that work on a Prius Prime? Even if ICE is not running, the "engine is on" in a way. Tried doing an Erase but all the codes came back. Next plan is to disconnect the 12V for a 1/2 hour or so, then see if codes are still there. But I'm guessing a 2020 Prime will have a way to remember all that stuff, like when you take battery out of a phone it still retains everything.

 

So does a Prius have any "ignition on, engine off" mode as far as getting a OBD II scanner to Clear Codes? IIRC "key detected in car" is same as "off" on Autel. MAYBE the manual old style physical key override? Never tried it, maybe that is next.