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Catalytic monitor not ready

Tiny
JAMESW2024
  • MEMBER
  • 2006 PONTIAC G6
  • 3.9L
  • V6
  • 2WD
  • AUTOMATIC
  • 189,000 MILES
20 warm up drive cycles and Cat monitor still not ready. No codes, nothing wrong (battery was disconnected and bad; replaced it and performed drive cycle multiple times but still not clearing). I just cleared the DTC thinking it might reset itself. Now, I will be starting all over again. I was wondering if there is any thing I can do to speed ups the process?
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Monday, November 18th, 2024 AT 9:34 PM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Can I ask if the engine warms up to operating temperature? If the engine stays cold because of a stuck thermostat open it will take forever for the monitors to set. Please go over this guide which can help us.

https://www.2carpros.com/articles/how-to-reset-an-engine-computer-monitor-program

Here is how to change the thermostat out in case you see that the engine is not heating up correctly. Check out the images (below). Please let us know what happens.
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Tuesday, November 19th, 2024 AT 10:31 AM
Tiny
JAMESW2024
  • MEMBER
  • 4 POSTS
Yes the engine operating temperature is normal, for every cycle the temp reach 219 or so. All monitors are being reset except the Cat. Last night I decided to erase and start all over again (this was done after running 20 warm up cycles). I know I could have waited longer but I decided to start fresh. There were no codes. As far as software updates, this model has been discontinued and I suppose GM does not have any further updates
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Tuesday, November 19th, 2024 AT 10:53 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
It can take some time to set the monitors and the drives must be short drives and long drives and there is no set method to get the monitors to set exactly just recommendations.

Start the engine and let it idle for 2-3 minutes.

Accelerate steadily to 55 mph and maintain that speed for 5-10 minutes.

Drive in stop-and-go traffic for about 10 minutes, including at least 4 complete stops and idling

Accelerate steadily to 60 mph and maintain it for another 5 minutes.

Give this a try and let me know
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Tuesday, November 19th, 2024 AT 11:00 AM
Tiny
JAMESW2024
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  • 4 POSTS
That is similar to what I usually do: idle 5 minutes, idle with 1000 rpm steady for 1 minute, 5 minutes at 35 mph, 5 minutes at 45 mph, 3 minutes at 55 mph, decelerate to 20 mph without braking, back up to 60 mph for 5 minutes, back to city traffic and stop and go, then idle for 3 minutes and off. From cold repeated for 20 cycle. Today, did the same, tried to hook up the Innova lat + with live data scanner: it gave me error KW 2000 unable to communicate bus can. Previously there were similar codes (but not recently) those were see image below
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Tuesday, November 19th, 2024 AT 4:24 PM
Tiny
JAMESW2024
  • MEMBER
  • 4 POSTS
I did a total two more warm-up drive cycles after re setting the DTC and the CAT cleared.
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Tuesday, November 19th, 2024 AT 9:14 PM

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