Code p06dd 2014 Silverado

[Tim deKay]

Hello,

I had the check engine light on my 2018 Siverado 5.3 with 36K on it, came on, great local shop said it was P06DD.

Reset the error after testing pressures and checking for leaks etc. From this forum, and online chat, it seems this will be a problem again. Love my truck, but don't want those headaches. My 2006 Duramax never had a problem at all.

Time to rethink this brand of gas truck. Oh heck.

[fmblizz]

My 2014 Silverado which I purchase new, has been throwing the P066DD code intermittently for  3 years now.  I have no performance problems that I can tell.  My engine is the V6.  With the Check Eng. Light on the engine will not drop into the V4 mode.  After 50-100 miles of driving it will again start to drop into the V4 mode and shortly after that the code will clear itself.  This will only last for a few days at which time the entire cycle repeats itself. It's almost like clockwork.  I do regular oil/filter changes and my oil pressure is consistently between 45-55 psi.  My problem is that in the state of NJ and Check engine light will fail you for inspection so I have to time it right..  LOL

 

Any thoughts would be greatly appreciated.   

 

 

Edited May 25, 2022 by fmblizz
additional information..

[Jayselectricco]

I am dealing with this code P06DD, I would clear the code and when it switched to V4 mode it would immediately switch back to V6 mode and then give me a pending P06DD.  I noticed my temp would never go past 180, my thermostat was stuck. Replaced it now it goes to 210 and the code disappeared.. for a little while. Now it comes back on at random every now and then.  Seems like when I am accelerating hard.  I am curious about what you said about your oil pressure though.  You said yours stays between 45-55.  Before I replaced the thermostat my oil pressure never went below 45, after I replaced it when the engine gets hot and I stop it will go on back to 20-30 range , and when I accelerate hard it will climb up to 60 sometimes past that.  I was told that was the correct range of the oil pressure with this engine. You might have a thermostat that is starting to fail, what is your temperature like ?

[fmblizz]

My engine temp usually runs in the area of 205.   I've been dealing with this for like I said 3 years.  I don't clear the code because the code clears itself after a few days..  The agency I purchased the truck from wanted to replace the oil pump at a cost of $2300 and that was 3 years ago citing I could be damaging   my engine.  Oil pressure seems to be running high all the time but as long as I have pressure, and I watch it like a hawk,  I'm not spending the money which is now in the $2600 range I'm hearing.  Maybe I'll look into the thermostat at some point but I've always been a believer if it's not broke, don't fix it.

 

 

Edited May 29, 2022 by fmblizz

[Jayselectricco]

I understand what you mean.  I talked to an engineer that used to work for Toyota, he says that the ECU is in another mode until the engine gets "hot." Once it gets to this point then it starts changing things.  He said that GM wants the engine to get to its "hot" temperature as quickly as possible because that's where it's most efficient. He claims that the ECU will do everything it can to get the engine to that temperature including putting the 2 stage oil pump in high mode to increase oil pressure to warm it up more quickly.  If you are running 205 and under your failing thermostat could be causing your computer to "flirt with being in warm mode" if that makes sense.  That would explain why it is intermittent.  Everyone I have talked to with a 4.3 and 5.3 said the temperature goes to 210 and then stays there and doesn't move... If it is at 205 and fluctuating at all I would say your thermostat is starting to fail.  It's a very cheap part and very easy to replace, might be worth it. My oil pressure was high all the time before I replaced my stuck thermostat. It really never went under 50. As soon as I replaced it when it got hot, she dropped on back to just above 20 at idle. My code was coming back on every now and then but I figured out my oil was about 1.5 quarts low because I was always checking it on an incline.  Filled it up to where it is supposed to be and haven't seen the check engine light since, I also put an AC Delco filter on at the same time, and a new oil drain plug(because the o ring was flattened where someone had over-tightened it and had slow leak), and filled the coolant reservoir back up where I lost antifreeze when I replaced the thermostat.  I have heard people that had the P06DD and needed the oil pump replaced, however theirs was actually "stuck off" and their oil pressure was @ 70 all the time.  Also another thing is the oil pressure sensor filter screen. I don't know if you have tried replacing the oil pressure sensor yet, but there is a plug about 3-4 inches back from it you take the plug out and there is a screen filter down it (you have to pull out with needle nose pliers) if it is dirty the oil pressure sensor can be getting the wrong readings and cause this code.  I honestly think your problem is not the pump, its something stupid like my problem was lol.  Also, do you have dexos 1 approved oil in it? Make sure it isn't the "high mileage" oil because it has extra additives that make it thicker, and a thicker oil can trigger P06DD by being the wrong viscosity.  For example a 5w-30 high mileage oil is really similar to a 0w-40 is what I read somewhere.  If you ask me these vehicles are getting way to sensitive, just like a woman, everything has to be just right. haha 

[Im Lon 2]

My 2014 started doing this every time it gets close to oil change time. It’s been doing this now for 3 years. Have Taken it to the dealer twice first time they said the code went off and doesn’t show an issue now. 2nd time they said looks like it does this when I get close to an oil change. Just popped on again tonight. Guess what time it is? Took it by a parts store sure enough. The crazy thing is the light will come on and off before I get it in for an oil change. 

[Roger Peebles]

On 6/1/2022 at 12:54 PM, Jayselectricco said:

I understand what you mean.  I talked to an engineer that used to work for Toyota, he says that the ECU is in another mode until the engine gets "hot." Once it gets to this point then it starts changing things.  He said that GM wants the engine to get to its "hot" temperature as quickly as possible because that's where it's most efficient. He claims that the ECU will do everything it can to get the engine to that temperature including putting the 2 stage oil pump in high mode to increase oil pressure to warm it up more quickly.  If you are running 205 and under your failing thermostat could be causing your computer to "flirt with being in warm mode" if that makes sense.  That would explain why it is intermittent.  Everyone I have talked to with a 4.3 and 5.3 said the temperature goes to 210 and then stays there and doesn't move... If it is at 205 and fluctuating at all I would say your thermostat is starting to fail.  It's a very cheap part and very easy to replace, might be worth it. My oil pressure was high all the time before I replaced my stuck thermostat. It really never went under 50. As soon as I replaced it when it got hot, she dropped on back to just above 20 at idle. My code was coming back on every now and then but I figured out my oil was about 1.5 quarts low because I was always checking it on an incline.  Filled it up to where it is supposed to be and haven't seen the check engine light since, I also put an AC Delco filter on at the same time, and a new oil drain plug(because the o ring was flattened where someone had over-tightened it and had slow leak), and filled the coolant reservoir back up where I lost antifreeze when I replaced the thermostat.  I have heard people that had the P06DD and needed the oil pump replaced, however theirs was actually "stuck off" and their oil pressure was @ 70 all the time.  Also another thing is the oil pressure sensor filter screen. I don't know if you have tried replacing the oil pressure sensor yet, but there is a plug about 3-4 inches back from it you take the plug out and there is a screen filter down it (you have to pull out with needle nose pliers) if it is dirty the oil pressure sensor can be getting the wrong readings and cause this code.  I honestly think your problem is not the pump, its something stupid like my problem was lol.  Also, do you have dexos 1 approved oil in it? Make sure it isn't the "high mileage" oil because it has extra additives that make it thicker, and a thicker oil can trigger P06DD by being the wrong viscosity.  For example a 5w-30 high mileage oil is really similar to a 0w-40 is what I read somewhere.  If you ask me these vehicles are getting way to sensitive, just like a woman, everything has to be just right. haha 

That is a great answer! Thanks for taking the time to discuss P06DD. MY 2014 Silverado is showing it intermittently when oil pressure rises on engine warm up to almost 60 psi. I also have temp not nailed on 210 but flirting with it. If I stop with engine hot, turn it off then restart the oil pressure sits where it should at 45.  I will replace thermostat and oil pressure sensor and get back to you. Thanks again!!

[Jayselectricco]

Your welcome, hope that it helped you out.  I noticed my truck stopped going into V4 mode at random after 2000 miles and I changed the oil and it operated normally again. I noticed however that the oil was a lot dirtier than it should be after 2000 miles.  Before I changed the oil I checked the code reader and had a pending "P06DD" So it made sense if the oil is dirty then the viscosity of the oil has changed is why its triggering the code.   After researching the things that would make your oil dirty quicker, I stumbled on the topic of the PCV valve.  I read in another post that the PCV valve was the most common thing to go out on these trucks, and the most common sign of it going bad is oil getting dirty quicker.  So I replaced it (another cheap quick repair) and changed the oil again and I could instantly tell that the truck ran better. If my PCV valve was actually bad then it couldn't have been "breathing" correctly, and I expect to see some sludge in my next oil change where the Mobil 1 will clean it. Probably will get dirty quick again, but hopefully for the last time.  I am also going to replace the oil pressure sensor screen filter again, some people have told me to throw it out and not replace it, however others have said that this is to protect the AFM system so I will just replace it. One thing about all this still puzzles me however. The 5.3 and 4.3 are virtually the same engine except the 4.3 is short 2 cyl, most of the parts are the same thing.  So why does the 4.3 use 5w-30 and the 5.3 use 0-w20? Could it be that the computer is looking for 0W-20 just like the 5.3 and that would explain why the 4.3 is so sensitive to dirty oil? It says in the book that the 4.3 can also use 0w-30, and I know that's only thinner at startup but I wonder would it make any difference? Just like "Im Lon 2" says it comes back near oil changes, I wonder if he had thinner oil if it would come back ? I am hesitant to change thickness of oil much because of the AFM uses the oil as "hydraulic fluid." So I don't know maybe try 0-w30 when I change the oil again. May be the wrong way though, it may need thicker oil, or it may not make any difference just a thought.  

[Rogerp]

Great points! Thanks again for the detailed write up. I will do pvc valve!

 

[Jayselectricco]

Yes sir, your welcome. Did you replace the thermostat? Any luck with resolving your code?

[Rogerp]

Not yet will keep you up to date. 

[Jayselectricco]

On 9/7/2022 at 10:35 PM, Im Lon 2 said:

My 2014 started doing this every time it gets close to oil change time. It’s been doing this now for 3 years. Have Taken it to the dealer twice first time they said the code went off and doesn’t show an issue now. 2nd time they said looks like it does this when I get close to an oil change. Just popped on again tonight. Guess what time it is? Took it by a parts store sure enough. The crazy thing is the light will come on and off before I get it in for an oil change. 

Just curious what oil and filter are you using when you do an oil change?

[Rrs0010]

On 4/14/2020 at 8:15 PM, Bryson said:

I have a 2014 Silverado  with 162,000 miles.  And it just started  to pop up a code PO6DD engine oil pressure control performance circuit stuck off  and the oil pressure  is running  at 70. And it stays  on v8 and does not change to v4. Once I  clear the code  it drops back down to  40 pounds.  And everything is  fine.  I was told  to oil pump  need to be replaced, I  heard  cylinders 7 and 8 might be stopped up. Can anyone  help  me with this?

Having this issue did you get it fixed? What was it? 
 

last week i also noticed that my fan was randomly staying on after i cut my truck off. Even after cold starts and stops and the temperature gauge wasn’t going up, This is obviously something to do with the thermostat, anyone change the thermostat and have the code go away? 

Edited November 29, 2022 by Rrs0010

[Rogerp]

Sorry for late reply. I have not changed my thermostat yet. The P06DD code has gone away on its own. The code was being set due to oil pressure after start remaining higher than usual. Sometimes the pressure would return to normal (no code set after I cleared it) and would not return. Sometimes I had to stop and turn engine off then restart and pressure would return to normal with no code set. I’m guessing something got unstuck. Good luck and keep us posted!

[B2131978]

On 10/6/2020 at 8:25 PM, Matthew Lennon said:

Bump. 

I started using a Range and the code cleared itself right up, now I am sending the range back for an update. Unplugged the range 3 days later same code comes back PO6DD. I am gonna caulk it up to my truck hates going into V-4, anyone else ever experience anything like this?

I had range in my 14 5.3 and was fine. No issues. After 3 years took it out and bam. P06dd popped up. Oil pressure up to almost 70 and felt power loss