Clearing CEL by disconnecting battery

[BoldlyGoing]

I feel like I'm taking crazy pills over here-

I'm in the midst of trying to address the ever-so-fun quadruple O2 sensor code issue (032,038,052,058)

I had some exhaust leaks welded up over the weekend, so I wanted to clear the CEL and see if they come back.

So, I disconnected the battery for a minute or two, reconnected and the CEL is still on, codes still showing up.

I feel like there should have been a few minutes for those to pop back up? I can't recal the CEL ever staying on after a battery disconnection before.

Am I wrong?

 

[Chris]

First off, how do you own a Jeep and not an OBDII scanner?

Secondly, you need to keep the battery disconnected for longer I believe, like 10 minutes. That's what I've heard at least. Maybe I'm wrong?

 

[CodaMan]

When it's disconnected touch the - and + cables together. That will drain the residual power being stored in the PCM.

 

[BoldlyGoing]

First off, how do you own a Jeep and not an OBDII scanner?

Secondly, you need to keep the battery disconnected for longer I believe, like 10 minutes. That's what I've heard at least. Maybe I'm wrong?

I suppose I've always assumed the reader didn't tell you any more than the on/off/on/off/on trick does.

In 10+ years of TJ/LJ ownership, this has always gotten me by!

 

[Chris]

I suppose I've always assumed the reader didn't tell you any more than the on/off/on/off/on trick does.

In 10+ years of TJ/LJ ownership, this has always gotten me by!

The live data streaming capabilities of a modern reader can be very, very helpful. Also the ability to clear codes with the press of a button is nice too.

Not to mention that at maybe $50 tops for a nice reader, it's hard to beat. Especially when they work on all your other vehicles too

Anyways, if this works for you, that's all that matters.

 

[BoldlyGoing]

The live data streaming capabilities of a modern reader can be very, very helpful. Also the ability to clear codes with the press of a button is nice too.

Not to mention that at maybe $50 tops for a nice reader, it's hard to beat. Especially when they work on all your other vehicles too

Anyways, if this works for you, that's all that matters.

I suppose in each instance (until now), that I've had a CEL, once I got the code, the problem was obvious.

This latest has been... annoying

 

[Jerry Bransford]

I suppose I've always assumed the reader didn't tell you any more than the on/off/on/off/on trick does.

In 10+ years of TJ/LJ ownership, this has always gotten me by!

Same here but there are some codes the built-in code reader won't read like transmission codes for example. When my 42RLE transmission shit the bed a few years ago all the built-in reader gave was a generic code that just basically said transmission problem. It wasn't until I got home and connected my cheap Harbor Freight Tools scanner that I was able to get the more precise transmission code that helped me figure out what was going on.

 

[BoldlyGoing]

When it's disconnected touch the - and + cables together. That will drain the residual power being stored in the PCM.

Even this doesn't seem to be working... currently pulled them, touched them together, and am now gonna give it 1 beer's time to "reset"


Really hoping this isn't indicative of the PCM issue I've seeen other people mention on other threads...

 

[Jerry Bransford]

Even this doesn't seem to be working... currently pulled them, touched them together, and am now gonna give it 1 beer's time to "reset"


Really hoping this isn't indicative of the PCM issue I've seen other people mention on other threads...

I hope so too, perhaps Mark at @Wranglerfix will have some insight on that particular problem. 05-06 Wranglers have more than their share of PCM bugs and problems.

 

[BoldlyGoing]

I hope so too, perhaps Mark at @Wranglerfix will have some insight on that particular problem. 05-06 Wranglers have more than their share of PCM bugs and problems.

In the meantime, as I sit here stewing as the clock runs down on the time I have before I absolutely MUST pass an emissions test,

Anyone have a preferred PCM vendor?

 

[Jerry Bransford]

In the meantime, as I sit here stewing as the clock runs down on the time I have before I absolutely MUST pass an emissions test,

Anyone have a preferred PCM vendor?

www.wranglerfix.com who has come up with the fixes for the 05-06 PCM issues, that's why I mentioned them above.

 

[Viking Jeeper]

I've had limited success clearing codes with my reader but mine is a cheap one that connects to my phone.

 

[BoldlyGoing]

Good news! The code has cleared.

Now I'll drive around a few days and see if they come back...

after going through the hassle of new cats 2 yrs ago, I really hope I don't have to go that route again.

 

[BoldlyGoing]

www.wranglerfix.com who has come up with the fixes for the 05-06 PCM issues, that's why I mentioned them above.

Ah, ok.

 

[WallyWest]

Fastest way to make sure power is drained is disconnect battery, turn on headlights. They may come on at low power for 30 seconds or so, but as soon as they are definitely dead just wait a minute or two more and it's all clear.

 

[Wranglerfix]

@BoldlyGoing

Faulty o2 sensor readings are one sign of a faulty pcm on the 05-06 TJ’s.

Do you have any other symptoms? Hard shift when cold or high transmission temperatures?

You can call me at 866-888-7710 whenever you’re free to discuss in further detail

Thanks,

Mark

 

[BoldlyGoing]

@BoldlyGoing

Faulty o2 sensor readings are one sign of a faulty pcm on the 05-06 TJ’s.

Do you have any other symptoms? Hard shift when cold or high transmission temperatures?

You can call me at 866-888-7710 whenever you’re free to discuss in further detail

Thanks,

Mark

So far nothing. It's a manual so the shifting issues obviously wouldn't show up.

I did (until this past weekend) have a handful of exhaust leaks that have been now been repaired.



Here's hoping that cures it.

 

[Wranglerfix]

@BoldlyGoing Manuals are a horse of a different color. A few signs of a faulty manual pcm are Bad o2 sensor readings, low rpms and stalling while driving.

 

[BoldlyGoing]

@BoldlyGoing Manuals are a horse of a different color. A few signs of a faulty manual pcm are Bad o2 sensor readings, low rpms and stalling while driving.

Nothing like that.

the only thing I can think of is that occasionally the RPM's don't drop when I stop.

if I tap the pedal they'll drop back down.

I think that's either a throttle body issue or TPS sensor.

the only codes I'm getting are the 32,38,52,58 O2 codes.

I'll circle back here if they pop up again now that the exhaust issues are sorted.

it is entirely possible that the sensors are bad as I know that in the 5 yrs I've had this Jeep, I have never changed them.

 

[Wranglerfix]

Okay. You can call me if you have any questions