O2 sensor heater codes 2011 silverado

[Scott Hallock]

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 June 9, 2025 by Scott Hallock
Forgot info

[davester]

charm.li will have diagnostic procedures for those codes, specific to your truck.

[Scott Hallock]

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

[newdude]

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]

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

Edited June 11, 2025 by txab