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2013 Sierra 1500 PO420 Code

ChevyTuff
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tbarn
tbarn

99.9% of  the time P0420/30 is a bad cat. You're making it more expensive and harder than it needs to be.

CamGTP
CamGTP

P0420 is the drivers side cat, P0430 is the passenger side cat.   P0135 is a circuit code on the bank 1 sensor 1 o2 sensor, that being the drivers side. Could be a bad new sensor. I only run

CamGTP
CamGTP

OEM means AC Delco or Denso parts, not anything else.   I have part numbers of Denso 2344668 or possibly 2133866. Most auto parts stores carry them as well.    

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ChevyTuff Enthusiast

ChevyTuff

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I found a little shop in Missoula with a good reputation, and he's going to try and figure it out. It seems I'm just getting the P00530 code now with the running poorly after it is driven, shut off, then run again. I'll suggest what you said to him and see what he says.(If the wiring for the O2 sensors is good, then it is time for a new ECM.)

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ChevyTuff Enthusiast

ChevyTuff

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Hi everyone. I took my truck back to the Chevy dealer today, and the still insist it's the Cats causing my problem. They said they found codes PO155 / P0059 / P0050 / P0154

Here is their Diagnosis. 

Please let me know what you guys think. I trust you more than these guys. They want $1750.00 just for a Y pipe ..... plus installation.

 

IMG_2090.jpg

ChevyTuff Enthusiast

ChevyTuff

Posted
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Posted

Hi guys . I took my truck back to the Chevy dealer today, and they did a free diagnostic. They are still insisting it's the Cats causing my problem. They said the got these codes.:

PO155 / P0059 / P0050 / P0154

They want $1750.00 for the parts  plus labor to install the Y pipe. 

I trust you guys more than ny dealer at this point. Let me know what you think now.

IMG_2090.jpg

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

I think we've exhausted our opinions on this. I personally don't think it's the cats at all.

ChevyTuff Enthusiast

ChevyTuff

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I think you are right Cameron, and I don't relish the idea of another $2000 to install cats and not fix the problem. I talked with a different mechanic shop, and they want to look at it next Friday. So from what you have said, and the fact that both Oxy sensors responded when they squirted brake cleaner into the intake and got 800 MV spike, maybe it's the ECM.

tbarn Senior Enthusiast

tbarn

Posted
Posted (edited)

Again, these codes are o2 sensor heater codes only. Nothing to do with fuel trims or convertors. Strictly an electrical issue.

 

Edit. P0154 is not a heater issue. The other 3 are. 

DTC P0154

HO2S Circuit Insufficient Activity Bank 2 Sensor 1

 

DTC P0050

HO2S Heater Control Circuit Bank 2 Sensor 1

 

DTC P0059

HO2S Heater Resistance Bank 2 Sensor 1

 

DTC P0155

HO2S Heater Performance Bank 2 Sensor 1

 

Without a p0430 code I'm not buying the bad convertor diag.

If it were me, I would go after the 3 heater codes and see if I find a related issue with the P0154 code.

Not sure if it still holds true but it had been true that you always start with the lowest code first. The only way I see a convertor causing an oxy sensor code (P0154) would be a plugged convertor. Not likely given their age.

Edited by tbarn
ChevyTuff Enthusiast

ChevyTuff

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I'm between a rock and a hard spot on this. I thought the dealer would be able to figure this out. My only hope now to get this solved is that the new mechanic next week can get to the bottom of this. This has gone on way too long.

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
4 hours ago, ChevyTuff said:

I'm between a rock and a hard spot on this. I thought the dealer would be able to figure this out. My only hope now to get this solved is that the new mechanic next week can get to the bottom of this. This has gone on way too long.

Well, the dealer did figure it out, you just don't trust their judgment.

ChevyTuff Enthusiast

ChevyTuff

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Would this scanner work on my 2013 Sierra? They don't indicate which software it comes with, but they say "Latest Software" 

 

https://www.ebay.com/itm/Tech2-Scanner-Diagnostic-tool-for-GM-cars-trucks-SAAB-etc/254841357062?_trkparms=ispr%3D1&hash=item3b55ba8306:g:mvwAAOSwAXhgCkN2&amdata=enc%3AAQAFAAACcBaobrjLl8XobRIiIML1V4Imu%2Fn%2BzU5L90Z278x5ickkrDx%2B2NLp21dg6hHbHAkGMZNLKY93QliFSiF%2Fr4bsN11zNFtEldo8es%2BBPzyx3tboT6V8DLC0Hjxy30PIodTM1iZfc8wnf0pchfixtLM4lFhfl12Ydb7ihr3iXxLpV0CHkGMz2HzdNz3sYXKIezR4vbGvDrVX7fGiPdXkUw8eRTQUhHC%2BUgBCtROIJj7IU3J4ulcins6gOja5a0XkeW7NHAdLlTI50UXgVSMrzyM4BWg3LkzhKiKClzxnvGpdkVJYgClwUrxxMaIzA9S45KQSiJ0fqs9YXb06nggvuWwkZ4ivKDC1PCqAy%2BMjmgTpSfYVTWl5BvkSzA8rYk0OkmtOqMshNxImEIT1hWRi0eX46547h8v3%2FPgSPnL70n%2B7bRYZI5aSd6XKdVLuayvN6T6hFZri6%2B0qadXuKWDIhzMjrss9TzMQNLObJJxVGVfX4Q8K%2F%2FrfODmtnDSqluraWFRBvxEhvqYEwxdXN0V25RywJ0SY8Gve7oHMKEkr8SMMgbOQtELkOQvXAs0C7Cf9Z%2FcINHxb6zDeBjmrt%2BskF8mYpQoqqdQn%2BbbaOSkBBt6jTX%2BfbAuwia6wpp6%2BxVQrnO5%2FH%2BdaCdxmtjiXctyUBTaSJne%2BZV0k2nFKvfdNrzKZpUmSxjbix8cf2JWuHeYndrG%2BG8MRWubWf6JZrx5iss%2FPSvnOlZkJ4gZ5lItafoPTJPZo%2BEvbC6Ou2ekHRVeIiCuoYqajP9ORcAohRQsI13RGG6OCMUF4MVc7rClr5rKLd0w3Ro6XIzgnXDIMCUokXOxiLQ%3D%3D|cksum%3A254841357062d4e0abf72add400890ba8e2672896b1e|ampid%3APL_CLK|clp%3A2334524

 

tbarn Senior Enthusiast

tbarn

Posted
Posted

Yea it would but don't be under the illusion that it will magically tell you what is wrong. It takes the tool, knowledge of how to use the tool, and probably a diagnostic tree. Maybe you can handle it, I don't know.

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
14 hours ago, ChevyTuff said:

Would this scanner work on my 2013 Sierra? They don't indicate which software it comes with, but they say "Latest Software" 

 

https://www.ebay.com/itm/Tech2-Scanner-Diagnostic-tool-for-GM-cars-trucks-SAAB-etc/254841357062?_trkparms=ispr%3D1&hash=item3b55ba8306:g:mvwAAOSwAXhgCkN2&amdata=enc%3AAQAFAAACcBaobrjLl8XobRIiIML1V4Imu%2Fn%2BzU5L90Z278x5ickkrDx%2B2NLp21dg6hHbHAkGMZNLKY93QliFSiF%2Fr4bsN11zNFtEldo8es%2BBPzyx3tboT6V8DLC0Hjxy30PIodTM1iZfc8wnf0pchfixtLM4lFhfl12Ydb7ihr3iXxLpV0CHkGMz2HzdNz3sYXKIezR4vbGvDrVX7fGiPdXkUw8eRTQUhHC%2BUgBCtROIJj7IU3J4ulcins6gOja5a0XkeW7NHAdLlTI50UXgVSMrzyM4BWg3LkzhKiKClzxnvGpdkVJYgClwUrxxMaIzA9S45KQSiJ0fqs9YXb06nggvuWwkZ4ivKDC1PCqAy%2BMjmgTpSfYVTWl5BvkSzA8rYk0OkmtOqMshNxImEIT1hWRi0eX46547h8v3%2FPgSPnL70n%2B7bRYZI5aSd6XKdVLuayvN6T6hFZri6%2B0qadXuKWDIhzMjrss9TzMQNLObJJxVGVfX4Q8K%2F%2FrfODmtnDSqluraWFRBvxEhvqYEwxdXN0V25RywJ0SY8Gve7oHMKEkr8SMMgbOQtELkOQvXAs0C7Cf9Z%2FcINHxb6zDeBjmrt%2BskF8mYpQoqqdQn%2BbbaOSkBBt6jTX%2BfbAuwia6wpp6%2BxVQrnO5%2FH%2BdaCdxmtjiXctyUBTaSJne%2BZV0k2nFKvfdNrzKZpUmSxjbix8cf2JWuHeYndrG%2BG8MRWubWf6JZrx5iss%2FPSvnOlZkJ4gZ5lItafoPTJPZo%2BEvbC6Ou2ekHRVeIiCuoYqajP9ORcAohRQsI13RGG6OCMUF4MVc7rClr5rKLd0w3Ro6XIzgnXDIMCUokXOxiLQ%3D%3D|cksum%3A254841357062d4e0abf72add400890ba8e2672896b1e|ampid%3APL_CLK|clp%3A2334524

 

If the photos are an accurate representation of what you will receive, then yes, it has the latest software.  33.004.

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