Jump to content

'05 4wd Silverado 5.3 Codes Po 131, 171, 300

lowmanj

By lowmanj
in Ask A GM Technician

Recommended Posts

lowmanj New Member

lowmanj

Posted
Posted

My truck has been running fine until this week it started to idle rough at times. It was running rough the other day and the check engine light came on. I checked the codes and got PO 131, PO 171 and PO 300. It seems like it will idle rough sometimes and them smooth others. Would the PO 300 code cause the other codes or the other way around???

 

The truck is a 2005 Silverado, long wheel base, 4wd, 5.3 engine, with just under or around 50,000 miles. It does have a K&N air filter on it but that is about it.

 

I checked other post for problems but hope for help with this year and model. The weather is not very good here at this moment so I just quickly checked on a few things I read about. I was going to check on the distributor but it does not seem to have one. I want to look for the fuel pressure regulator but not sure of the location at this time. Maybe the FPR, spark plugs, O2 sensor????

 

I have a basic code reader I will carry with me to read the codes if the check engine light comes back on this week, as I am sure it will since it still runs rough.

 

If I need to give any more information, please let me know.

 

Any help will be greatly appreciated.

 

Thanks, John Lowman.

jmilleraf426 Enthusiast

jmilleraf426

Posted
Posted

P0131 is telling you that the computer is reading a low voltage on your O2 sensor on the drivers side, closest to the engine. (Bank 1, sensor 1). You can try swapping the sensor to the same position on the other side and see if the code follows it (you will get a P0151 if it does). If it does then the sensor needs to be replaced.

 

PO171 Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

 

PO300 you really need to look at the misfire code in the ecm... there will be data saved with it... that shows all the sensor readings at that instant when the code was set... that saves a lot of time.... then you can duplicate the speed and load to watch the scan tool readouts...

 

id try to work cheap then go to the more expensive things

  • 2 months later...
  • 7 months later...
godav Enthusiast

godav

Posted
Posted

My truck is doing the same thing, has been running fine until this week it started to idle rough at times. It was running rough the other day and the check engine light came on. I checked the codes and got PO 300, PO 171. It seems like it will idle rough sometimes and them smooth others. It did have PO 131 but after all the work it has not came back.

 

2005 Avalanche 1500, 4wd, 5.3L engine, around 120,000 miles.

 

I checked everything, and have searched the web in depth but with no avail. I have a friend that has a major scanner and he has been working with me, we have seemed to check everything, I even changed the Intake Manifold (Used one from NAPA it was re-designed to prevent warpage), didn’t help. I am at my wits end not to mention my moneys end; I have not swapped out the O2 yet since the code went away after the Manifold swap.

 

If I need to give any more information, please let me know.

 

Any and all help is greatly appreciated

  • 2 weeks later...

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • bluev8
      Intermittent no-code issues on 2022.5+ V8 trucks — what did the shop fail to capture?

      By bluev8 · Posted

      That makes sense, and I think you are describing the real product problem. Capturing data is the easy part. If the owner or technician has to manually dig through five minutes of millisecond-level logs, the product has already failed. The device would be at the ECM harness, not at the OBD port, so I agree that data retrieval and event marking need to be thought through carefully. The way I am thinking about the architecture is: The recorder itself should not depend on a phone, app, Bluetooth, Wi-Fi, or cloud connection to capture the event. It should always keep a local rolling buffer and lock the event locally. A button, phone app, or small cabin device would only act as an event marker. If the driver feels a stumble and presses the button 10–30 seconds later, the pre-buffer has to already contain the useful data. For data retrieval, the practical options would be a sealed service USB lead, Wi-Fi download, or a phone/cabin companion device. I would not expect the owner to remove the ECM-side module or work with raw files directly. The cloud or AI side would be for interpretation, not for capturing the event. The truck may have no connection when the issue happens, so the evidence has to be saved locally first. After that, cloud processing could help decode the data, compare it against baselines, and generate a readable report. For the first version, I would keep the automatic triggers conservative and objective: driver event marker bus-off error passive voltage drop / brownout device reset FIFO or queue overflow a normally periodic message disappearing side-to-side communication mismatch, if the topology supports that For “learning normal,” I agree with your point, but I would not want to overclaim it as automatic root-cause diagnosis at first. A realistic first step would be learned baseline comparison for that specific vehicle and operating condition. For example, a value would only be compared against similar conditions: RPM range load / MAP throttle position gear / vehicle speed coolant and oil temperature battery voltage AFM/DFM state, if decoded and validated Then the report could flag things like: this periodic message disappeared compared with its normal timing this value deviated from this vehicle’s normal range under similar conditions the same abnormal pattern repeated after the same type of event the anomaly occurred together with voltage, oil-pressure, misfire, or communication changes But I would still call that “abnormal pattern detected,” not “replace this part,” unless there is enough validated repair data behind it. So the intended product would not be “here is a huge log.” It would need to be an event package: what triggered the capture how much pre/post data was preserved what changed before and after the event whether the device itself reset, overflowed, or saw a bus error selected graphs around the event raw data only as supporting evidence From your perspective, what would make this kind of report useful instead of just another datalog? For example: What are the top 5 parameters or events you would want highlighted first? Would you trust a learned baseline for that specific vehicle, or would you prefer fixed thresholds? How much false-positive flagging would be acceptable before you stopped looking at the reports? What would a one-page report need to show for an independent shop to take it seriously? For misfire, AFM/DFM, oil pressure, or U-code complaints, what would you want the tool to flag automatically?
    • scotthvac.net
      2022-24 halogen - led grille swap

      By scotthvac.net · Posted

      2024 Silverado 2500 HD LTZ grille no camera Parts list   84603331 84913656 84913657 84913654 84913655 84911567 84911568 85646092 85646093 85797921 85797922   11570637  x10-15   grille/bumper bolts 11546500  x10      grille clips 11571006  x10      push/retainer clips 11546454  x6       nut retainers 11611609  x6       M5 bolts 11610700  x6       molding/trim retainers
    • davester
      Replacement Radiator

      By davester · Posted

      And use RA's 5% discount code if you buy from them.  google for the code, one is always available.
    • davester
      Turning radius

      By davester · Posted

      Just don't turn the steering wheel as much?
    • Snowcamo
      Replacement Radiator

      By Snowcamo · Posted

      Rockauto bud. I pass local stores for parts.   Findya something online. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...