Jump to content

Engine Codes

bremkat

By bremkat
in Ask A GM Technician

Recommended Posts

bremkat New Member

bremkat

Posted
Posted

2004 GMC Yukon 4wd 5.3L

 

I had the check engine light come on and when I check the codes I get 2 code each time. P0101 and P0171. What should I look for or do to resolve these codes?

 

Josh

ChevyTech007 Enthusiast

ChevyTech007

Posted
Posted

As stated above, the intake gaskets are very probable. You might want to check this also.

This message applies to all 1999 through 2004 Chevrolet, GMC, Olds, Buick and Cadillac pick-ups and utilities that are equipped with either the 4.8 liter, 5.3 liter or 6.0 liter Gen 3 V-8 engines. Recent warranty analysis indicates that both the MAF, or mass airflow sensor, and the MAP, or manifold absolute pressure sensor, are being replaced for a MAF sensor code P0101. The cause may actually be a MAP sensor failure causing the MAF sensor code. One of the MAP sensor’s primary functions is the calculation of the speed density formula, which is compared to the MAF sensor reading. Should the MAP sensor fail, the PCM may interpret this as a MAF sensor concern and set a P0101 code. If diagnostics are followed thoroughly the technician may find a MAP sensor failure causing this condition. In conclusion, when a MAF sensor code of P0101 is found the technician needs to verify the proper operation of the MAP sensor before concluding that the MAF sensor requires replacement.

C6Racer Enthusiast

C6Racer

Posted
Posted

Intake leaks are common? Guess I've been lucky. I have 148k miles on my 5.3L and the only codes I've gotten were for both S.A.I. check valves at around 130k miles. My valve cover gaskets seem like they're starting to go. Is there anything else I should "look forward" to replacing?

bremkat New Member

bremkat

Posted
  • Author
Posted

I tried cleaner on the MAF. The light is gone and I have had no trouble. In fact it seems to be running a little better since. Thanks for your help. I hope this is the problem and no a leak.

  • 2 months later...
BretD04GMC Enthusiast

BretD04GMC

Posted
Posted

I just got my second P0101 code since owning my truck. The first time was apparently due to a dirty K&N filter after driving through a very dusty area. Cleaned the filter and the code went away. That was about a year or so ago. Since then, I've also switched the K&N filter on my CAI for an AEM Dryflow that uses no filter oil.

 

Today, I got the P0101 code again. I suspect it may again be due to a dirty air filter. I drive by the beach every day and also work by the beach. The truck gets dirty very quickly every week, so odds are the filter is due to be washed.

95Sierra2500 Senior Enthusiast

95Sierra2500

Posted
Posted
I just got my second P0101 code since owning my truck. The first time was apparently due to a dirty K&N filter after driving through a very dusty area. Cleaned the filter and the code went away. That was about a year or so ago. Since then, I've also switched the K&N filter on my CAI for an AEM Dryflow that uses no filter oil.

 

Today, I got the P0101 code again. I suspect it may again be due to a dirty air filter. I drive by the beach every day and also work by the beach. The truck gets dirty very quickly every week, so odds are the filter is due to be washed.

 

A properly cleaned and oiled K&N won't cause any issues with your MAF. I've got a K&N on 3 different vehicles, and NONE of them have given me issues with the MAF sensor. Whenever I purchase a K&N, the first thing I do is wrap it in rags and let it sit for a day to soak off excess oil. I then run it for about a year. I clean them about once a year, and always clean from the clean side to the dirty side using the spray-on cleaner. Let dry, then use the aeresol oil, not the squeeze bottle. I've never had an issue with an over-oiled K&N using the aresol. In fact, every over-oiled K&N I've ever seen was recharged using the squeeze bottle...coincidence? I think not.

BretD04GMC Enthusiast

BretD04GMC

Posted
Posted
A properly cleaned and oiled K&N won't cause any issues with your MAF. I've got a K&N on 3 different vehicles, and NONE of them have given me issues with the MAF sensor. Whenever I purchase a K&N, the first thing I do is wrap it in rags and let it sit for a day to soak off excess oil. I then run it for about a year. I clean them about once a year, and always clean from the clean side to the dirty side using the spray-on cleaner. Let dry, then use the aeresol oil, not the squeeze bottle. I've never had an issue with an over-oiled K&N using the aresol. In fact, every over-oiled K&N I've ever seen was recharged using the squeeze bottle...coincidence? I think not.

 

I too have never had any trouble with oil from a K&N. My DTC seems to be just from the filter(s) getting too dirty (from the conditions I drive in) and restricting some of the air flow. I changed to the AEM only because I liked the idea of not having to oil the filter and therefore reducing down time during cleaning.

 

Checking the AEM Web site, they recommend cleaning their filters more often. In fact, every 3,000 to 5,000 miles if you drive in dirty conditions.

 

A little Simple Green soaking tonight should hopefully clear up my P0101 code.

 

On a side note: Gotta love having a ScanGauge II on the truck. As soon as I saw the MIL was on I was able to instantly pull up the code to confirm the problem.

Archived

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

Go to topic listing

  • Latest Articles

  • Posts

    • Atlas
      Looking at ordering a '26 WT because I want a std cab, std bed

      By Atlas · Posted

      GM's are stainless and have a fairly robust powder coating, although, still not worth $850 in my opinion. They will hold up a lot better than their cheaper steel aftermarket counterparts.   What I like about the GM step bars is dealers will often equip their dealer stock with them. Lots of margin. Which means a lot of people end up buying them because they're already on the truck, even if they don't like them. So it's pretty easy to find brand new takeoffs with hardware on Marketplace and Craigslist for about $250.   That's what I did for my crew cab. I wanted ZR2 rock rails for the look, but with the ability to bolt up GM's assist step package. From GM it's about a $2500 accessory all in. The old folks in my life can't get in the truck without steps. I found the whole package on marketplace for $180.
    • kr477
      Forward collision and lane keep assist still a problem on 2022 refresh?

      By kr477 · Posted

      I am really glad I found this post and this site... We have a 2022 1500 refresh LTZ that has these problems: - forward collision avoidance warning light - lane keep assist unavailable - adaptive cruise control unavailable   The truck was bought as a new leftover in 2023, so it was still under the 3/36 B to B when it went in for these problems earlier this year. It has been at the dealer on and off now for about 110 days now. These are some of the things they have done that I can read on the service tickets. - replace/add ground straps (4) - check all battery cables and vlts - replace serial data gateway module - replace front view camera - numerous reprogramming - a few calibrations (apparently ending with 'learned') Last week when I had it back the truck had those 3 warnings every time we used it except for 3 times. On three separate occasions the truck started and ran perfectly with no (zero) warning messages or warning lights lit - everything worked perfectly. Over that same time period the truck did not work on every other 'key' cycle which I would estimate at 60+ cycles. On those estimated 57 cycles it had the same 3 problems each and every time.   It is back at the dealer now - can anyone help at all with what the true problem might be?  Or possibly what can be ruled out leaving a lower number of possibilities? Thank you very much for any help you may be able to supply....     
    • Z45
      Looking at ordering a '26 WT because I want a std cab, std bed

      By Z45 · Posted

      As for the step bars, friend did just that, bought some cheap ones and we are in Michigan and they turned to rust in less than a year.  In 3 yrs he had to replace one of them because they rusted out from the inside even though he kept after them cleaning and polishing etc. Had to drive 300 miles (to Chicago area) to find a reg cab wt, he ordered one and dealer never got it and with winter approaching (plow truck) he needed fo find one ASAP.  Furd dealer found him one but he choose to drive to get a GMC.    Just what you can expect with cheap stuff, LOW quality. 
    • KARNUT
      Tonneau cover that does not leak water

      By KARNUT · Posted

      I’ve seen many times people over buy to start a business. Instead of quality equipment they buy junk and drive an expensive truck. Our first haul truck was a 2 ton wrecker with 6 cylinder to haul our equipment. It would go 60 miles per hour flat out. Our trucks were older trucks we could work on easily. Our equipment was first class that we could work without fear of breaking down. You could always use large trash bags to wrap for water proofing. Put the money where the return is. Comfort and luxury comes with success. Good luck in your venture.
    • cherryred21duramax
      Tonneau cover that does not leak water

      By cherryred21duramax · Posted

      Thank you, it looks like I have to get a topper or a box van.  Unfortunately, the only vans that can tow what I am looking for are going to be 3/4 ton vans, which may ride rough if I am going to use this on the road extensively.  I may also use it to take marketing clients out on the road.   Not knowing anything about starting a business, my goal is to start small, use things I already have & keep everything in good working order.  I have a small box trailer, need to install lights in it, and same for the topper itself.   How easy does Chevy/GMC make our trucks to upfit if we decide to add things like a topper and lights?  On Fords, the upfit process was rather easy.  Just tie the +12V of the lights to the AUX relay panel and the - to chassis Ground.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...