[Commutator]

Hi, OP here. Sorry I haven't been checking for awhile. I got P2599 again towing on a pretty tame grade. Dealer said the code indicates a turbo problem but due to cost and potential for other issues when messing with it they want to see the code more often before doing anything. This is my last summer of powertrain warranty and I won't be towing outside of southern Ontario where it's pretty flat. I have to admit I'm inclined to leave well enough alone rather than try to force them to do major work and maybe end up with worse problems on my own dime.

 

[redwngr]

2 years and still not resolved or am I misunderstanding?

Rather than wait and do repairs after warranty runs out, I'd be taking an weekend or an evening or 2 and trying to find a place for a test pull. The amount you save by doing it under warranty could make it worth your time.

How about on the 400 between TO and Barrie?

Or maybe the climb from Hamilton up to Ancaster?

They're not that long, but the grade could be steep enough.

 

[Ron Nielson]

Commutator

I wouldn't let my warranty pass the century mark without them fixing the truck. If nothing else, it will diminish the sale price, and/or the sale-ability of your truck, should you choose to sell it in the future. No way would I buy a truck with an unresolved DTC code.

I note that some P02599 codes are found to be problems in the wiring circuitry. I believe you posted earlier about erratic performance and withing is always suspect. All electrical problems are similar in this respect.

But it's your truck, and your money. We all live with the choices we make.

 

[Commutator]

I wasn't looking for any help at this point - just adding info as several people were looking for the final resolutions in other cases. I'm 4+ yrs in with it happening twice. First with a vane sensor code and that was fixed. Second was 1.5 yrs later with P2599 on its own. Again, WOT on a long hill - which many will question the sanity of in the first place. Dealer couldn't find anything and cleared it.


redwngr, I've never had the code around here (including the places you mentioned and many more) and I do push it hard on hills. I did take it out for a hard run heading north after the first service. No luck. As this has happened twice since new in 2012 and only when pushing it really hard on a hill, many will say there's nothing wrong with the truck, just with my right foot. I have this thing about holding my speed on hills.


When I researched the first codes I got there were several people reporting on here that they pursued GM very aggressively and got either a new turbo or a replacement truck. They reported ending up with the same codes again, or even worse after the turbo replacement. Cause for pause before insisting on something I may not really need.


We have 4 or 5 more trips this year. Unless I get the code again it's a moot point. If I do then I'll see what GM recommends and, as pointed out, live with the choice I make.

 

[Johnm]

I had the same code come up several times for us last week while pulling our ~7500# TT but we didn't go into limp mode ... thank God! The AC was on but not screaming as it wasn't too hot outside, we were on I80 in the middle of Nebraska (no steep hills). Maybe we were passing someone? Speed was between 65 and 75 depending upon traffic.

My point is we weren't "pulling heavy" like y'all are talking about, it was more like nice and easy towing.

I have a OBD2 reader on order (just a simple one that can read and clear codes) so I won't have to worry about not knowing whats going on for 100 miles to get to a shop again, but ... if these codes come back again and we go into limp mode in the middle of no where, what do I do? How do I get out of limp driving 20mph?

 

[Commutator]

Just for the record, here's the latest chapter in my saga - but probably not the last. I got the P2599 for the 3rd time in August. The previous time was last October when dealer cleared it after testing it. This was my first trip of over 4 hours since last October. This truck does not get a lot of use. I wasn't climbing any long, steep hills on the trip so maybe the common factor is a long trip - all with 14000# load.


The turbo replacement did not go well, but that's a subject for another thread rather than drift this one. I have to get out and work the truck to see how it holds up - before warranty expiry in the spring.

 

[mlb6xxx]

I have had my 2013 lml 3500 4x4 go into limp mode 3 years in a row on the same mountain/ same spot! I'm pulling a 40ft 5th wheel that weighs about 14k. It's been the same codes each time--p2263, p0234, &p2599, but the dealer gives me the same old run around--can't duplicate it, no codes in ecm nothing we can do!! What a bunch of crap, they said I was overloading it @ 14k when its rated to 22500 lb. Now they said its up to GM before they will do anything to repair!! GM needs to get off their butts & take care of these problems--NOW instead of their blame game tactics! These problems started @ 20k miles & still have them now @ 40k.

 

[G2GBY]

Are you clearing your codes befor taking it into the dealer? They should be still there in history.

These are easy things.

Have you cleaned your MAP Sensor or replaced it?
GM Part No.: 12643955 SENSOR, MAP(INCLUDES 501) Fitting Vehicle Options:CK2,3(LGH,LML) $22.21

Have you check your pigtail out.
ACDelco PT2619 GM Original Equipment Manifold Absolute Pressure Sensor Pigtail

 

[G2GBY]

It's been the same codes each time--p2263, p0234, &p2599.

There are hundreds of threads like this one.
Google "Duramax + your code individualy or together" lots to read and what was there fix.
http://www.dieselplace.com/forum/63...max-fifth-generation-2011-2016-lml/904225-p0234-p2263-p2599-towing-up-hill.html

 

[Commutator]

I can't tell you for sure whether the warranty replacement of the turbo solved it for me. Due to some health issues this year we've been on no trips longer than 2 hrs, and no real hills. Truck works great, but always did except for the "annual" codes.


...Fred

 

[bcoville]

Thru a P2599 Code yesterday

Yesterday, towing 15k 5th wheel heading into Las Vegas, my truck blew a P2955 code and no other code. My 2011 GMC 2500hd has 140k miles. I did not go into degrade mode and the truck seem to run great. At the time the engine light went on, I was traveling about 70-75mph, outside temp, 90+ and climbing a grade outside of Mesquite, NV. I stopped to re-fill up just outside of LV. Check the codes and found to be P2955 code. I cleared the code with my reader. Traveled back to my final destination Lake Havasu City, AZ, roughly 200 miles away. No other codes gen'd, no other problems. But, I did reduce my speed to 60-65mph.

been reading a number of comments regarding this issue in this forum and others. Seems the problem could range from full replacement of Turbo charger to simple do nothing.

I've been having my truck service at the local dealer here in LHC and they have been very good on fixing the truck up. Will take there today to see what they say.

I

 

[Ron Nielson]

Would be good to know if your code was P2599 or P2955.



What oil do you use? Any biofuel use? What gear and RPM were you you in when DTC posted?

 

[mbmcdermott18]

I have a CEL light on and got the call from the dealer that it is P2599 and I need to replace the turbo. I questioned as to what exactly was wrong with the turbo and the service writer responded that the turbo just "was not functioning". When asked what would cause such a failure they responded that time and mileage were responsible, most likely time. Truck is a 2011 with 110k on the clock. I have owned it since new. There are also 5 service bulletins on the truck they are saying need to be done:indirect injector, DEF tank, glow plug, NOx sensor, EGR cooler bypass valve.Truck is also throwing another code indicating that the thermostats need to be replaced which sounds reasonable after doing some research on the subject and I notice the truck appears to be running a bit cool.

In my research on the P2599 code it appears that it is not uncommon for people who are towing a decent load. I tow 17k short distances every week and recently made a tow with the same load from NC to south MS. I do not notice any reduced performance in the truck.

It appears that folks who get this code have done nothing or replaced the VPS sensor and/or solenoid or replaced the entire turbo.

Is there a definitive answer to what causes the P2599 and if so what is the fix?? From what I have read it would appear we are jumping the gun with replacing the turbo in its entirety without more information. They want 16 hrs plus parts to change the turbo and the turbo oil lines.

 

[Rvn4me]

DTC P2599 - Turbocharger Boost Control Position Performance - High Position

testing procedure:

Circuit/System Verification

1. Ignition ON, observe the scan tool DTC information. Verify DTC P06D2, P168C, P168D or P2263, is not set.

2. Engine running, observe the scan tool TC Vane Position Sensor and the Desired TC Vane Position parameters. Command the TC vane position sensor in 5 % increments from 0-100 %. The parameters should remain within 2 % throughout the commanded range.

3. Engine running, observe the scan tool TC Vane Position Sensor and the Desired TC Vane Position parameters while slowly increasing the engine speed to 2,500 RPM and slowly returning to idle speed. The parameters should remain near or equal throughout the engine speed range.

4. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Inspect the turbocharger for debris, sticking vanes, or damage. Refer to Turbocharger Cleaning and Inspection See: Engine > Overhaul > Turbocharger Cleaning and Inspection.

◊If a condition is found, clean or replace the turbocharger as necessary.

2. Inspect the Q41 turbocharger vane position control solenoid valve and B112 turbocharger Vane Position Sensor for damage or sticking.

◊If a condition is found, test or replace the affected component as necessary.

Component Testing

Turbocharger Vane Position Control Solenoid Valve

1. Ignition OFF, disconnect the harness connector at the Q41 turbocharger vane position control solenoid valve.

2. Measure the resistance across the Q41 turbocharger vane position control solenoid valve terminals. The resistance should be between 3-7 ohms.

◊If greater than the specified range, replace the Q41 turbocharger vane position control solenoid valve.

3. Test for infinite resistance between each Q41 turbocharger vane position control solenoid valve terminal and the solenoid valve housing.

◊If less than the specified range, replace the Q41 turbocharger vane position control solenoid valve.

4. Ignition OFF, remove the Q41 turbocharger vane position control solenoid valve.

5. Connect the Q41 turbocharger vane position control solenoid valve harness connector.

6. Ignition ON, command the TC Vane Pos. Cntrl. Solenoid ON. Depress and hold the CAM follower slightly at the tip of the TC solenoid valve while observing the slot closest to the CAM follower for the spool valve to move to the open position.

◊If the spool valve did not move to the open position, replace the Q41 turbocharger vane position control solenoid valve.

Turbocharger Vane Position Sensor

1. Remove the B112 turbocharger vane position sensor.

2. Connect the B112 turbocharger vane position sensor harness connector.

Note:
It is normal for the TC Vane Position Sensor voltage to quickly return to approximately 4.9 V as the plunger reaches its fully depressed position.

3. Ignition ON, observe the scan tool TC Vane Position Sensor voltage while slowly depressing the plunger at the end of the B112 turbocharger vane position sensor. The voltage should decrease smoothly from approximately 4.9-0.2 V.

◊If the TC Vane Position Sensor parameter drops out or spikes, replace the B112 turbocharger vane position sensor.

 

[mbmcdermott18]

Thx Rvn4me. I emailed the service writer this morning and asked him to confirm that the vane position solenoid and vane position sensor were both tested and what the result was. Have not received a response even after a follow up email this afternoon.

 

[mbmcdermott18]

I brought the truck back to the dealer and asked that they perform the service bulletins before we go any further. They performed the service bulletins on monday and thus far I have not had any codes. Truck still runs great. I am glad I did some research on this site before agreeing to major repairs!