GM 5.3 6.2 P0172 P0175 Fuel Trim Rich Diagnosis And TSB
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- Опубліковано 24 кві 2020
- WATCH PART 2 REPLACING THE HIGH PRESSURE FUEL PUMP! Next video on the channel!
In this video we cover GM Vehicle’s Fault Code troubleshooting for P0172 and P0175 Fuel Trim Rich, Specifically on a 2014 Chevy Silverado 5.3 Fuel Trim Rich Diagnosis. This applies to GM 4.8L, 5.3L, and 6.2L V8 engines equipped with Direct Injection. - Розваги
You explain this nicely, nice job on the video with a total dispense of any b/s. I mean, I'm still kind of lost but I get the gist of it. :)
Great write up bro... I like how well you explained it. May I bring up just a few things I believe would help people? So when you unplugged the MAF with it running and went back to looking at the fuel trims it really didn't show that big of a change. First thing is because if I was you I would have reset the long term fuel trims in the scanner to show the instant changes every time you made a diagnosis change. Second is in order to get into SD mode on GM vehicles you have to set a failed MAF code in the PCM. That is 2 trip logic code so it needs to see the failure 2 times before it sets the code. In other words 2 key cycles unless its changed to a 1 trip failure in the tune. Whenever I tune the VVE table in these I first have to fail the MAF and set the code before the PCM references SD and I can then tune it. Otherwise it still will reference the old fuel trims and then your just tuning in circles. This is probably to much info for the standard person trying to figure out there problem, but I thought it couldn't hurt to add this info for the highly skilled techs. I have also had a lot of these HPFP fail and leak fuel into the crankcase. In fact one was so bad the the engine because to tick from the diluted oil and then would stall from the low rail pressure. Great video and keep up the great work and help you are showing people.
Kind Regards,
Ryan
Thank you
Great video. I have sane issue on 5.3l. Could it be just the oil getting sucked in from the pcv? I don't know if it has ther same hpfp like that 6.2l
Thanks
Nicely said and done!
Great video. What shuld the LT trims be at at 40-50mph?
Great video on the money bro
I have 2001 gmc sierra with a 5.3l and ive replaced the fuel filter fuel pump and fuel pressure regulator and its still running rich about -31 shft bank1 and 2
I did the same tes but my engine turned off during the procces...is this a normal behavior?
Nice. My 2013 Si;verado had LTFT B1 -25.8%, LTFT B2 -25.8% and P0172 Fuel System Too Rich (Bank 1). Startup takes 15 seconds. Take-off is very sluggish. 140k with O2 sensor errors. P0053 for “Heated O2 Sensor (HO2S) Heater Resistance (Bank 1, Sensor 1).”
Fuel Injector leaking.
I’m having a 5v reference code also a high pressure voltage high code…. Any idea?
Good Video
i have a 2018 Tahoe with 5.3L
only 42,000 KM
Check Engine Light just Came on P2099 : Post Cataytic Fuel Trimm Too Rich ?
what Gives
I have a Yukon 5.3l with these same codes and I checked the dipstick and had a strong smell of gas from the oil. I just purchased this vehicle a few days ago and Im worried the pumps been leaking for some time and reducing viscosity of the oil. Im going to drain the oil and hope I dont see any metallic shavings.
You this failure is common on gm ls engines. Have you seen engine damage from contaminated oil from a leaking fuel pump?
Yes and no. This is an interesting topic though. Typically modern day oil is pretty resistant to breakdown from fuel, but yes enough of it can absolutely change the oils properties. By that point though it’s probably going to trip oil pressure codes and or the low pressure light. I wouldn’t sweat it too much and just confirm the HPFP needs to be replaced. Definitely change the oil asap.
Hello Pete , I have a 2014gmc sierra with 212,000 miles, and I have a P0420 , P0430 and a p2099 code . I've been trying to figure out but it's been beating me. I've replaced all the 02 sensors and nothing changes. I've replaced the cats as well but the codes remain the same. Do you have any suggestions besides getting a new vehicle?
I had a throttle body relearn done to fix the constant problem after cleaning it. I think I may have made a mistake I did a fuel composition reset using X431 on my 2011 5.3 flex fuel suburban , currently have e85 in my tank. Now I have 2 code errors p0171-00 and p0174-00 fuel trim lean system lean bank 1 and 2. Did I do something wrong? I would appreciate any help what to do and proceed. Thank you
I’d say very likely you do in fact have a lean condition if that occurred after a fuel comp reset. I’d monitor it on live data and look at what the trims are showing. Lean condition can be a number of things but I wouldn’t necessarily blame it on a comp reset.
@@Pete_Tech_ I did a reset using gasoline filled everything is working fine now. But I feel there is a small continuous leak keeping my fuel rails at 45psi . Since 85 barely you can smell the odor of gas , I smelled something today since my suv is filled with gasoline only . but i still cant find the leak.. my fuel consumption is more than normal its like my tank is leaking only when its on. i checked my gauges perfect, using my scanner I checked everything and also my hwy is 18mpg but with my fuel gauge dropping faster than normal feels like 8mpg.. I used several model gauges to read my average and instant mpg and its good. My question is can a micro hole somewhere with car on can leak out fuel through my fuel line to cause this?
even in lean condition my suv was eating gas.
Question- Did you know there is a recall on the High pressure fuel pumps? RECALL - HIGH PRESSURE FUEL PUMP LEAKAGE
# 14858: Product Emission - High Pressure Fuel Pump Possible Leak - (Feb 19, 2015)
It is ongoing… My 2015 Chevrolet Silverado 1500 with RPO L83 is on it but vin not coming up. Figuring it out with GM now
I'm going to get in contact with my dealer on Monday and attempt to schedule this recall repair.
New Fuel pump fixed it????
Nice good info
Ok but mine IS rough running. Very rough running. Replaced fuel pump and re learned the trim several times but it inevitably always comes back in a short time with rich or lean codes and runs rough. What do I do????
Check the MAF. Check how responsive your O2s (although that would usually be a particular bank condition).
Let’s think about what controls fueling. We need to meter air, and we need to meter fuel. MAF tells pcm the air volume/density. O2s feedback the AFR for corrections/correlations.
Assuming all the mechanic is good, properly working HPFP, proper fuel pressure, healthy compression, proper timing, etc. Always verify the mechanical first.
I have both codes on a 12 GMC Sierra. I do have a bad ac condenser though? Like no air cooling at all. Could this be giving me rich codes because of there being a bad ac condenser?
Definitely Not! These HPFPs fail, and the Valves Carbon up as well. Its the inevitable.
@@Pete_Tech_ so it's def not anything to do with the air condenser? So possible injectors or fuel pump than I'm guessing. I appreciate the reply
Awesome video! I need help. I am getting a steady 45 psi on my car 2011 suburban 5.3. I feel like its dumping fuel because my fuel gauge goes down more than normal. I see everyone else mention 50 to 60 at the rails but i am using my expensive x431 scan tool to check everything. All of a sudden after 1 month of using e85 its been extremely bad. Fuel gauge drops fast. I cant find no wet fuel leaks by the engine compartment. My mpg normal at 15 to 18. Now feels like 6. I am also using a scan gauge to read the mpgs and its not bad hwy is 18mpg both dash and scan gaugeii. What the hell is there a small leak some where only when its on? I get no code errors.
I’d put money on your HPFP is leaking into the engine. Check your oil yet?
It takes about 30 percent more e85 than it would regular gas . Just saying
What part you change
Did you found the problem?
I need your help man. I got the same codes on mine. 2003 how do I figure it out. Same issues. I have driven it for 6,000 miles with the check engine light coming on and off. Trying to track down what it is and I’ve changed a million things.
You have rich trim bank codes on an 03!? That’s rare hmu on insta Pete_Tech_
02 available 5.3 both banks rich 🤷🏻♂️
I'm having the same problem I think on my 06 Silverado 5.3 runs fine changed the fuel pump cause that's what auto zone said luckily it was under warranty and changed the mass air flow sensor light still not off I always fill up and run it to empty really could use yall help
@@Wayno228 hey mine doing the same you ever figure it out
My 2015 Silverado is throwing the same codes. Also idles really rough at low RPMs. Would that be the same solution?
What was your solution? Having these problems.
I'm having this issue
Any fix??
Had this issue, garage said alcohol % was showing 47%.
They reset and truck back working great But now few months later issue is back. Truck hard to start mornings, rough idle.
Reset is only short temp solution.
What should garage do?
2011 SLT Sierra 5.3l flex fuel. 185,000km’s
I got the same issue. 09 5.3l. Alcohol was high then low. I'm going to try the pcv test. not sure if ther 5.3 had the same fuel pump system though. could just be the oil getting sucked in from the pcv? Did you get yours fixed?
@@greyhairedmountainbiker116 reset alcohol then week later codes for oxygen sensors! I changed both oxygen sensors on the left side bank 2.
No issues yet.
Also I stopped refueling until it pour out! I had a habit of topping up the tank not realizing harmful to fuel pump and filters
@@gregwiggins9380 Im having the same false high readings of ethanol on my 2013 gmc sierra 1500 flex fuel. I was told by the dealer that short trips may be causing the false readings. Did you resolve your issue?
@@RR-ty6ki yes I changed both O2 sensors on passenger side, was getting codes for that too!
And big thing I think I’m NOT filling up the fuel tank to the gas cap!
I was doing this for the past few years.
Also I was adding a bottle of fuel injector cleaner with a overflowing fuel tank.
I would have issues it seem shortly after.
So
New O2 sensors, no overfilling tank. Issue gone.
Issue still gone?
Ok. I removed the pcv hose and plugged both ends as per ur video. My trims dropped to normal range! But about a minute later they climbed again. Any suggestions?
That is pretty common. Most likely the oil is so fuel saturated that it will permanently affect trims until the oil is changed. However, if you have this engine set up with over 120,000 miles it’s advisable that it probably needs a high-pressure fuel pump. Keep in mind I said probably, not certainly.
What if the truck doesn’t switch over to closed loop with engine warmed up ?
Coolant temp sensor?
I have the same codes and p0430 can runing rish couse that code for the cats
Um. I dont understand the end. Is there a part 2 or something??
noahkb80 there is a video on replacing the high pressure fuel pump as well as cleaning the intake valves
Is the high pressure fuel pump the same thing as a fuel pump in the gas tank? Had it changed but still a rich condition (p2099 and p2097 codes).
Would installing an oil catch can help this?
Help yes, prevent, no. 👍🏻
My Longft 1&2 is -25.8
Ford Ranger 2014 2.5L 4 cil Gasolina
-Codigo del vehiculo: P0172
Por favor ayuda!
Ya hicimos varias cosas y mi mecánico no encuentra la falla!
Se ha hecho esto:
-limpieza de cuerpo de aceleración
-cambio de filtro de gasolina
-cambio filtro de aire
-cambio sensor de oxígeno
-se calibraron los inyectores
Se le reviso:
Válvula PCV
Bujías
Bobinas
Mangueras de aire
Presión de gasolina
Y el código P0172 sigue apareciendo Aproximadamente 4 horas después de darle uso normal a la camioneta.
Que podemos hacer?
Mi mecánico ya no sabe que hacer y yo ya estoy cansado. Cada que la llevo me cobra algo nuevo.
estan cambiando por cambiar. tienen que limbiar bien INTEI O aralla como le dicen en otros paises. la carbonilla entre las valvulas de admision hay que limpiar.
Vendela!
I’ve done this 3 times and the codes keep coming back months later. What do I do now?
Look at my other videos you’ll see the repair.
I replaced mafs all four exhaust sensors and still the codes come up truck runs good but engine light keeps coming back on
? For these codes?
Inn the same boat bro!!!!
What about p2099?
My 2016 GMC Sierra have a very strong odor of gas fumes in the cab. My oil smell like gas when I changed it. I Took it to 3 GM dealerships to get it diagnosed no one can find the problem. I have no engine light on either.
I’d put a high pressure pump in it!
I've read that if you get fuel in the oil, its the high pressure pump.
Did you gain oil?
Have you been burning off white smoke?
Did you ever figure out what caused fuel in the oil?Thats happening to my 2014.
@@strayedarticle7666 I changed the high pressure fuel pump. I can still smell gas fumes in the cab. Come to find out it was the vacuum pump. Which GM has a recall on it and changed it out for free. Solved my gas fumes in the cab. As for the oil smelling like gas I just think is somewhat normal now. I have over 100,000 miles on my truck no other problems.
Buuboi214 thanks for the info.It must be sorta normal for oil to smell like fuel because mine does and my boss has an f150 and it did also.Maybe that’s just how it is with new trucks.
"we're not gonna wait, we're gonna get right into it" then it's over..?
Is there a part 2 or what?
If so why not post a link to it in your description?
Yes lol, just visit the channel friend.
What code reader is that?
Snap-on Triton D8
So what part was bad?
This is one of two videos. I would encourage you to check out the second part and consider subscribing!
Is this not the ethanol level being detected too high (falsely)?
No, the vehicle knows the ethanol level if it’s flex fuel capable. Rich trim codes mean there is an excess of hydrocarbons crossing the O2s in comparison to the calculation the vehicle man. High ethanol content will lean out fuel trims on a vehicle.
@@Pete_Tech_ Would a false high ethanol content on a flex fuel create a rich situation if the tank actually had regular fuel?
Is it just as common on the 6.2?
Absolutely
Have a Cadillac SRX 3.0. P0172 and 175.....new high pressure pump installed no fix...
Can always have a shop perform some diagnostics on it!
@@Pete_Tech_ I figured it out..was a bad mass air..
I missed it due to the settings in metric instead of grams on the scan tool..
@@andrewcimochowski what were you symptoms? i have a 2014 Chevy Silverado 5.3L V8.
Silverados usually are severe carbon buildup on intake valves, HPFP, or potentially dirty mass air flow. Use brake clean from at least 8 inches away from the screen and blast for 3-4 seconds. Blow dry with LOW pressure air, or let sit for 30 mins, then run vehicle again. Cleaning the mass air flow is a good place to start. Rare the Silverado mass air flows go bad on the newer ones.
@@Pete_Tech_ what's your opinion on using Seafoam to clean the injectors and replace the air filter? I've seen a few videos with error codes p0172 & p0175. they said this cleared the codes and the problem that seemed associated with an o2 sensor. symptoms being misfire, system too rich and even transmission slip like but the transmission wasn't actually slipping.
Where is part two for this issue?
On the channel!
I only have p0175 and long term is -30%.
Gross
Ok thank you now what’s the fix
Watch the other videos! HPFP!
My tahoe 2011, I don't know p0175
so is the fuel pump the problem?
Yes but you have to watch the other video on HPFP replacement to see the confirmed fix.
@@Pete_Tech_ how much does that job cost at the dealer?
@@Pete_Tech_ would ot be the same on an 06 Silverado I thought the fuel pump was in the tank
Maany b Carnero
And so video cutoff with no solution. Just gave it back to customer and told him to take it elsewhere