2012 Terrain Check Engine Light - SRXForum.net: Cadillac SRX Forum
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post #1 of 17 (permalink) Old 12-23-2016, 08:46 PM Thread Starter
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2012 Terrain Check Engine Light

Hello Everyone,

I have a 2012 GMC Terrain SLE FWD Flexfuel 4 cyl. We have put E85 in it 90% of the time since be purchased it in 2014. Wednesday the Check Engine Light came on. I assumed it came on because the "oil life" indicator had dropped to below 15%. I had already made an appt for an oil change at the dealership the next day so I asked them to check the code. They said it was the catalytic converter that had gone bad and it would cost about $1300 for the repair.

Since it was only a 2012 I was a little taken back. Although, it does have about 104k mi on it (50% interstate/highway driving). The dealership said the cat had an 8yr/80k mi warranty which ever came first, so they would not help me out at all (I was hoping they would since it was the dealership I bought it from).

I took it to Advance Auto to try to clear the code. I was able to clear the 3 codes, and the check engine light hasn't come back on, but the Catalytic Converter code remained and said it was 'permanent'.

Below are the screenshots from the tester showing the results. Are the O2 readouts normal? The other O2 sensor didn't have any numbers at all, it was simply zeroed out.

I'm hoping you guys can offer a solution that doesn't cost $800-$1300. I found this online and am tempted to try it since I'm pretty desperate. Have any of you tried it?
https://www.youtube.com/watch?v=nsX6ubEVV5w

I think E85 has contributed significantly to this problem, thoughts?

Catalytic Converter Message:


[Suspicious?] O2 Sensor readings:














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post #2 of 17 (permalink) Old 12-23-2016, 09:02 PM
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Re: 2012 Terrain Check Engine Light

I would try the magic elixir, seems like it can't make it any worse.

Not sure why you want to blame the E85 - but, I not even sure why anyone would use it. Seems like it isn't very cost effective.

2010 Equinox LTZ<br />4 cyl, FWD, S/R<br />Cardinal Red/Black
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post #3 of 17 (permalink) Old 12-23-2016, 10:57 PM
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Re: 2012 Terrain Check Engine Light

Did your nox have the pistons and rings replaced for oil consumption?

2012 Equinox 2.4L 1LT AWD, 75,000 miles
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post #4 of 17 (permalink) Old 12-23-2016, 11:42 PM
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Re: 2012 Terrain Check Engine Light

You might try replacing the 'other' OX sensor. IF it's zeroed out, it could be bad and 'lying' to the CPU.

Just a thought.

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post #5 of 17 (permalink) Old 12-24-2016, 09:44 AM
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Re: 2012 Terrain Check Engine Light

I guess I would be looking for a disconnected O2 sensor. And if that wasn't it, might consider swapping two sensors if it wasn't too difficult - to see if the problem moved with the sensor. I'd doubt you have a massive vacuum or exhaust leak that would produce a bottomed-out reading like that.

Was the vehicle serviced recently (for any reason)?

Also - why is the scan tool showing Mod $00? Is that "Mode 0"? Didn't think there was a Mode 0. Shouldn't it be showing Mode 5 or Mode 6 for Oxygen Sensor Monitoring? Did you simply read the code and then start cycling through screens below it? That's what it kind of looks like. I still haven't bought a new scanner or software to read my Equinox's OBD data yet - I'm used to simply reading the codes with my old Actron handheld and that's it, but I think with these newer, more "sophisticated" readers you may have to somehow initiate the O2 test? Not sure.

2011 Equinox 1LT (new Jan 2011): Summit White / 3.0 L V6 / FWD / Pioneer Stereo / 18" Wheels / 108+k miles (June 2017)

2002 Impala 1LT (new Jun 2002): Summit White / 3.4 L V6 / FWD / Cassette-CD Combo /202+k miles (June 2017)
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post #6 of 17 (permalink) Old 12-24-2016, 11:20 AM
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Re: 2012 Terrain Check Engine Light

Was the engine running when you took the screenshots that show a value of zero?

The upstream O2 sensor shows if the engine is rich or lean by giving a voltage, for reference, to the ECM.
The ECM counts the number of rich/lean crosscounts, it does this when the engine is at operating temp and in closed loop.
This is what determines pass/fail for the sensor, a low number of crosscounts is read by the ECM as a lazy or faulty O2 sensor.
It can only do this if the engine is running, if not it will show zeros or anything previously stored in memory.


The downstream O2 sensor shows how well your cat is working.

O2 sensors are normal maintenence items and should be replaced with new if you are having a problem.
I would do this as a first step before replacing a cat.

If you have been burning oil this could degrade a cat, as for using E85 I have not seen any data on this.

2014 Equinox LTZ FWD 3.6L. V-6 (LFX)
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post #7 of 17 (permalink) Old 01-22-2017, 02:47 PM Thread Starter
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Re: 2012 Terrain Check Engine Light

Thank you all for your responses. I'm sorry I haven't been back to respond but things are just now getting back to normal around here from all the traveling we've been doing. And for some reason I didn't get an e-mail notifying me of responses, I'll have to check my preferences on that.

Since I wrote this post the Check Engine light hasn't come back on, but I'm sure its still listed on the cpu as a permanent code. Would it have come back on if it were still a problem?

Anyway,

Rit- That's what I was thinking, I don't think it can hurt to try the Seafoam trick but I have to find a place I can go to do it without someone calling the cops. Not many places around here in SW Chicagoland to do this.

Ralphalph- I'm not sure what you mean by 'nox'? I have not had the piston and rings replaced for oil consumption.

dwendt- What do you mean by the 'other' oxygen sensor? So it is NOT supposed to be reading zero with the engine off?

Colt Hero- O2 sensors are welded onto the exhaust system, right? I'm not sure what Mod $00 means, this was the reader that Advance Auto had. There was no recent service done to the vehicle prior to the Check Engine light coming on. It happened to come on right when it was due for an oil change though (which I have done at the dealer).

rednox301- The engine was not running when I had the scan tool plugged in. Should I plug it in while it's running? I also noticed that all of the screenshots were referring to the sensor B1S1 which I think means the pre-cat sensor on cylinder 1? The confusing thing is that all of the screenshots say 'status = OK' as if everything is fine. But then again, that might be because the engine was off?
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post #8 of 17 (permalink) Old 01-22-2017, 02:50 PM
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Re: 2012 Terrain Check Engine Light

Quote:
Originally Posted by xboarder2000

Ralphalph- I'm not sure what you mean by 'nox'? I have not had the piston and rings replaced for oil consumption
Nox is short for Equinox.

Blue 2010 Terrain SLE-1 I4 FWD
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post #9 of 17 (permalink) Old 01-22-2017, 02:53 PM Thread Starter
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Re: 2012 Terrain Check Engine Light

Quote:
Originally Posted by Nick24
Nox is short for Equinox.
Thanks, it didn't hit me until I started looking at other threads.
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post #10 of 17 (permalink) Old 01-22-2017, 02:59 PM
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Re: 2012 Terrain Check Engine Light

Quote:
Originally Posted by xboarder2000
Thanks, it didn't hit me until I started looking at other threads.
Did you get a recall letter for oil?

Blue 2010 Terrain SLE-1 I4 FWD
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