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O2 sensor heater codes 2011 silverado

Scott Hallock
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Scott Hallock New Member

Scott Hallock

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2011 chevy silverado 4.8 lt 4x4 I have recurring bank 2 o2 sensor heater circuit faults p0050 p0056 p0155 p0161 both bank 2 O2 sensors were replaced by previous owner by a shop and same codes came back.. I got it and figured maybe they put in wrong sensors, I replaced all 4, same codes came back. Sensors test good. I'm getting power at pinks,and  ground at tans and pulsing grounds at grey,grey/wh,green,orange/wh, and purples I'm assuming are signals. Fuse 8 and 18 are good with power. Also checked engine grounds What can I look for next? Thanks

Edited by Scott Hallock
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  • Scott Hallock changed the title to O2 sensor heater codes 2011 silverado
Scott Hallock New Member

Scott Hallock

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Thanks davester forgot about that site, was having trouble finding wiring diagram, I should be able to find it there.

newdude Senior Enthusiast

newdude

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On 6/8/2025 at 8:08 PM, Scott Hallock said:

2011 chevy silverado 4.8 lt 4x4 I have recurring bank 2 o2 sensor heater circuit faults p0050 p0056 p0155 p0161 both bank 2 O2 sensors were replaced by previous owner by a shop and same codes came back.. I got it and figured maybe they put in wrong sensors, I replaced all 4, same codes came back. Sensors test good. I'm getting power at pinks,and  ground at tans and pulsing grounds at grey,grey/wh,green,orange/wh, and purples I'm assuming are signals. Fuse 8 and 18 are good with power. Also checked engine grounds What can I look for next? Thanks

 

 

Did you use OEM sensors?  And I don't mean a Denso one that says its the OE part.  The actual OEM sensors.  GM trucks are notorious for having O2 faults with anything but the actual OEM sensors.  

txab Senior Enthusiast

txab

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5 minutes ago, newdude said:

 

 

Did you use OEM sensors?  And I don't mean a Denso one that says its the OE part.  The actual OEM sensors.  GM trucks are notorious for having O2 faults with anything but the actual OEM sensors.  

Denso was OE factory installed on my 2 800 series. 

 

Edit to add: I see where his is 900 series. So:dunno:

Edited by txab

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