No 02 activity - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Zhedding · 10-19-2015, 04:02 PM

Hello, I have a 1971 Chevy c10 pickup that I put a 5.3 in I used a psi-conversion harness with it and I have been driving it for a few months without issue, a few days ago I hit a pretty good pothole and since then it runs really bad and its not getting and signal from either 02 sensor I put new sensors on both sides yesterday and still hasn't corrected the issue and they are both reading at .45 volts on my scan tool? The codes I'm getting are p0134( 02 sensor circuit no activity defected bank 1 sensor 1) and p0154 (02 sensor circuit no activity detected bank 2 sensor 1).

clinebarger · 10-19-2015, 06:47 PM

What year 5.3L? .450 MV is "Threshold" Voltage, Thats what will read all the time if there is a open circuit in the Ground or Signal circuits, Both O2's having this issue would lead me to a Ground issue, A lot of the early LS engines have a Case Ground for the O2's, Later ones use the Low Reference bus it the PCM.

cableguy0 · 10-19-2015, 06:49 PM

Im going to move this to the Ls section for you. I would personally be tracing wires especially any wires that are common to both sensors. Make sure all the harness connections are tight and double check grounds.

Custom 68 · 10-20-2015, 10:11 AM

check all your fuses and also any wiring plugs that might have came loose.

**Hart_Rod** · 10-20-2015, 11:14 AM

Gotta be a ground. Did you clear the codes and see if they came back?

Zhedding · 10-20-2015, 02:19 PM

2004 and yes I've reset codes and getting same code I'm going to check the ground again tonight but with the psi harness there is only one ground.

Zhedding · 10-20-2015, 02:23 PM

And what's weird is I'm only getting the rich white smoke on the passenger side.

BR3W CITY · 10-20-2015, 04:51 PM

White or gray?

White= coolant

Grey=fuel

Blue/black= oil

Pink&sparkels= you blew the flux capacitor. Common result of using those ebay sub-jigawatt power supplies.

Zhedding · 10-20-2015, 09:58 PM

Grey its rich, gas is dripping from pipe

Henney · 11-05-2015, 01:01 AM

Did you ever get this sorted out? I'm having a similar issue

10-19-2015, 04:02 PM	#1
Zhedding Registered User Join Date: Jan 2015 Location: decatur Posts: 14	No 02 activity Hello, I have a 1971 Chevy c10 pickup that I put a 5.3 in I used a psi-conversion harness with it and I have been driving it for a few months without issue, a few days ago I hit a pretty good pothole and since then it runs really bad and its not getting and signal from either 02 sensor I put new sensors on both sides yesterday and still hasn't corrected the issue and they are both reading at .45 volts on my scan tool? The codes I'm getting are p0134( 02 sensor circuit no activity defected bank 1 sensor 1) and p0154 (02 sensor circuit no activity detected bank 2 sensor 1). Attached Images

10-19-2015, 06:47 PM	#2
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: No 02 activity What year 5.3L? .450 MV is "Threshold" Voltage, Thats what will read all the time if there is a open circuit in the Ground or Signal circuits, Both O2's having this issue would lead me to a Ground issue, A lot of the early LS engines have a Case Ground for the O2's, Later ones use the Low Reference bus it the PCM.

10-19-2015, 06:49 PM	#3
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: No 02 activity Im going to move this to the Ls section for you. I would personally be tracing wires especially any wires that are common to both sensors. Make sure all the harness connections are tight and double check grounds. __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

10-20-2015, 10:11 AM	#4
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: No 02 activity check all your fuses and also any wiring plugs that might have came loose. __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

10-20-2015, 11:14 AM	#5
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: No 02 activity Gotta be a ground. Did you clear the codes and see if they came back? __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

10-20-2015, 02:19 PM	#6
Zhedding Registered User Join Date: Jan 2015 Location: decatur Posts: 14	Re: No 02 activity 2004 and yes I've reset codes and getting same code I'm going to check the ground again tonight but with the psi harness there is only one ground.

10-20-2015, 02:23 PM	#7
Zhedding Registered User Join Date: Jan 2015 Location: decatur Posts: 14	Re: No 02 activity And what's weird is I'm only getting the rich white smoke on the passenger side.

10-20-2015, 04:51 PM	#8
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: No 02 activity White or gray? White= coolant Grey=fuel Blue/black= oil Pink&sparkels= you blew the flux capacitor. Common result of using those ebay sub-jigawatt power supplies. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

10-20-2015, 09:58 PM	#9
Zhedding Registered User Join Date: Jan 2015 Location: decatur Posts: 14	Re: No 02 activity Grey its rich, gas is dripping from pipe

11-05-2015, 01:01 AM	#10
Henney Registered User Join Date: Sep 2014 Location: Portland, OR Posts: 133	Re: No 02 activity Did you ever get this sorted out? I'm having a similar issue



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