Are you sure it's Er AA? And just to be sure we're talking about the same thing, this is an indication in the trip meter, in place of the current mileage reading, right?

When the trip meter displays an "Er xx", it's indicating a problem in the LAN, the computerized network through which the car's control modules communicate with each other and various sensors and controllers. There's a list of possible "Er" signals in the factory service manual, but it does not include "Er AA".


“Er --” High speed and low speed CAN communication failed simultaneously
“Er HC” High speed CAN communication failure
“Er LC” Low speed CAN communication failure
“Er IU” Body integrated unit failure inside
“Er EG” Engine control module communication counter failure
“Er tC” Transmission control module communication counter failure
“Er Ab” ABS/VDC control module communication counter failure
“Er SP” Vehicle speed signal abnormal (ABS/VDC diagnostic trouble code information)
“Er SS” Vehicle speed signal abnormal (wheel speed signal abnormal)

 

Thank you for responding. Yes, I am sure it's "Er AA" as shown in place of the trip meter (not odometer, plain OM is correct). I am aware of the various "Er" codes from the factory service manual; however, Er AA is not listed. The dealer doesn't know what Er AA means either. Next time I get the code, I will take a picture and post it to our forum.

 

It means you should stop drinking and go to an AA meeting.

 

How about it is AB and the bottom of the B is missing for some reason on the display, I would call subaru of america and ask, something maybe screwed up in the way the computer reports to that display. (could be a real code, or multiple codes trying to get in)

at least yours reports to the display gen2's you got to count the flashes, like a cave man on reading morse code.

--. --- --- -.. / .-.. ..- -.-. -.- (= good luck)

 

Google search --> Er AA code in Odometer? - Subaru Legacy Forums.

Same 2008 2.5 (but Legacy) and CEL, AT Oil Temp etc. So the "AA" appears to be a possibility, even if it's not listed in the FSM!

 

Thanks plain OM. The Er AA showed up today with no CEL (P0420 pending, but don't know if this is related). The car is a manual so there was no AT OIL TEMP as in the previous post you cited. Here is a picture of it.

 

No question it's there, and the linked thread confirms that it's real.

Going "off-the-wall" to lighten up my mood a bit . . .

104,200 miles? Guess what's coming up . . . .?

[answer here]

Could Subaru have a built-in reminder in the 2008? (Not often noticed, no CEL, but a reminder nevertheless.)

Just an idea . . . ..

But here's another, also 2008:

http://legacygt.com/forums/showthread.php/weird-error-odometer-203666.html

And b??d Er aa - Outback - Forum SIP a Polish thread that concludes "thanks for the codes, the error was due to a bad connection" (Google translation)

Er AA must mean something but looks as if it's very rare.

 

Before someone makes a joke about Perogies, and Kielbasa.


Keep in mind things could be worse

 

To answer plain OM's question, a complete timing belt/water pump replacement was done yesterday, May 11, 2014. The Er AA mystery continues...!

 

This is an older thread, but I figured out what caused the Er AA code on the trip meter. The code will appear when I plug in my Innova 3030e ODB2 code reader while the ignition switch in the "ON" position (car running or not). The code reader user manual clearly states that you should plug the reader in first then turn the key to the "ON" position. I guess it pays to read the manual! Well, I still don't know what kind of error Er AA is, but I know how to make it to appear.

 

Wow.

That's really interesting.

If I understand it, the key is at ON, the reader is then plugged into the OBD connector, and the Odometer changes from distance to Er AA.

I wonder if there was a related trouble code, but not one that the Innova can read. LAN errors are prefaced by "B" or "U".

Instructions . . .. that could explain why we haven't seen this here before.

Many thanks for coming back with that!

 

If I understand it, the key is at ON, the reader is then plugged into the OBD connector, and the Odometer changes from distance to Er AA....

Yes, you are correct.

I wonder if there was a related trouble code, but not one that the Innova can read. LAN errors are prefaced by "B" or "U".

Good question...Don't know what the answer is.

 

Interesting, I had the same error when trying to use a progressive Snapshot device in the OBD2 port. It goes away as soon as I remove the tracking device. Guess I'm going to have to send it back to Progressive and pay the 10% more they charge when you refuse to use the device.

 

Hi,

I just wanted to chime in on the Er AA thread ... I realize it's ancient, I apologize for bumping if it's irrelevant ... to add my own experience which seems to match others.

I have a 3G cellular equipped OBD-II dongle (it's a "carloop", which is a DIY CAN device). The Er AA problem happens only when the cellular functions are functioning, and it's intermittent for me, so my assumption is that the CAN wires may pick up noise when the cellular antenna is in close proximity and that causes the error.

I noticed no drivability issues with this, in fact the only way I noticed it was that I glanced at the odometer before shutting the car down the other night and saw the code.

 

erAA code answer:
I found the answer to this dilemma. I also had that erAA on my trip meter. It turns out that using code readers have a tendency to trigger this code. I called Subaru dealers and none of them knew the answer. However, they offered to do a diagnostics check for a mere $185. I happened to know a master auto mechanic specializing in Subaru and he knew what was going on. Anyway, the erAA shows on your trip meter but doesn't show on your code reader. The fix is to erase all error codes with your code reader, although none are showing up. Then disconnect your code reader and you should be good. I went the extra distance and disconnected my battery for 5 minutes so the computer and everything would reset. I then went for a good ride and the code never came back.

 

I can also confirm that this error code is triggered by scanner. I plugged it in while the engine was running. (Manual says to plug scanner with ignition off.) Though I have done same in the past without getting error code.