Service Hybrid System 2013 Yukon
 

I have 2013 Yukon Denali Hybrid with 133,000. I took it into the dealer to have them replace the module in the GM Special warranty bulletin. They came back to me with the 12V battery didn't pass the GR8. I brought it home an used a battery tester to load test it. It only dropped to 11V and still in the low green for cranking amps. I know the 12V battery is not used for cranking so don't know why that would be an issue. Question is will a weak 12V battery cause the "Service Hybrid System" message when temperature is 51 degrees or below and then shortly turn off after start of driving? The message does not come on if it is warmer. The said none of the codes mentioned in the bulletin where in the history. IE U1821 and U182A. They said the code in history was multiple low voltage codes and GR8 said CCA was 86amps.

Re: Service Hybrid System 2013 Yukon
 

A low 12V can cause almost every conceivable code. I would trust a GR8 over your tester or my tester.

If it's the original battery, it's probably due.

Re: Service Hybrid System 2013 Yukon
 

Not original. It was built in April 2015, an AC Delco 48HPG. Suppose to be 42 month full replacement, but I don't have receipt.

Re: Service Hybrid System 2013 Yukon
 

Update: After dealership told me it was the 12V battery I got a new one. I still got the "service hybrid system" on the DTC. This seems to only come on when the temperature the car sits in is below 51 degrees. Lately it has been in the 40s and 30s and the message stays on a lot longer. It goes off after some time of driving on its own or I can hit the check mark button and it goes off. After parking in the cold for awhile it comes back on when I turn the key on or when I start it up. I took it back to dealer this time letting it sit overnight outside. When the tech started it sure enough it has the error message. After some discussion they agreed to order the parts for the special service letter and will be installing when the get them in. They told me, however they do not think that is the problem. They said they think it is, to the best of my recollection, the digital serial buss module and it would cost $500 for the part, if they can find one. Apparently only two dealers in the country show they had one and none are being manufactured. What say you?

Re: Service Hybrid System 2013 Yukon
 

Update: After returning vehicle to the dealership, waiting over 2 weeks for the parts and another 2 weeks for an appointment and then another half week because they didn't have a certified mechanic available to work on it, they finally installed the APM, taking 2 days to do so. Still has error message. They say I need a Serial Data Gateway Module and it is on national backorder and not manufactured anymore. This document clearly says to not replace the SDGM because it will not solve the problem. So the symptoms are cold temperature related. It started when temps dropped to below 51 and went away for the entire day as long as it stayed above. Now the we are in the middle of winter the temps are below freezing and the "service hybrid system" message is not only on in the morning, but also comes on all throughout the day. Today it was 29 degrees and once the message was cleared it didn't return till after shutting the vehicle off and restarting. Then when cleared it stayed off. So the replacement of the APM did change the symptoms. In addition prior to the replacement I watched the voltage reading displayed and it got all the way down to 12 volts at times. Now it stays at 15 and occasionally drops to 14 when the headlights are on then goes back to 15 shortly. So that symptom changed. So the mystery is did the defective APM cause the SDGM to throw a code deep internally that can't be reset by the computer and will it eventually clear or is there something wrong with the SDGM contrary to GM? It will cost me nearly $1000 to replace that module with no guarantee that is the issue.

Re: Service Hybrid System 2013 Yukon
 

Great updates, this will for sure help somebody in the future, if it is updated through to the final resolution.
My first thought is that this current dealer may not have the expertise with Hybrids that you need?
Somebody has probably already put this hybrid diagnostic chart on here? https://gsi.ext.gm.com/gmspo/mode6/p...iagnostics.pdf
We should be able to take this guide and with a Tech2 be able to guess at least as well as your current dealership?
Do you have any other dealers close by that you could use to get a second opinion?
.

Re: Service Hybrid System 2013 Yukon
 

I'm not sure if any service centers around here have the knowledge. I chatted with GM off their website and they said they would have to escalate to specialist. That's where it stands. I'm wondering if the tech didn't know how to clear the codes internally. It doesn't have any codes at the OBD2 that I can see.

Re: Service Hybrid System 2013 Yukon
 

I would not mind having a Tech2 scanner thing. i wonder if anyone on here has bought one for a reasonable price and could recommend a source and any accessories needed to read all Hybrid codes and others?
It looks like the cheaper ones on amazon etc are "clones" and I just am not sure if that will work or not...........

Re: Service Hybrid System 2013 Yukon
 

It's my understanding if you don't have updated software you can't read the most internal information. For example they told me that the Serial Data Gateway Module was throwing an internal code. Also if any of the hybrid modules are replaced they require programming from the most up to date software kernel from GM. Doubt if that is available to anyone other than dealers.

Re: Service Hybrid System 2013 Yukon
 

Just what I thought. After many days of phone tag with GMC special services I get nowhere. Refer me back to dealership and maybe they can reach out to the tech department. I need to talk to someone that was involved in formulating the special bulletin regarding this issue. https://gm.oemdtc.com/TSB/SB-10057008-5045.pdf So next step is to disconnect the 12V battery and the hybrid battery emergency disconnect? As I said no other symptoms just a message "service hybrid system"

Re: Service Hybrid System 2013 Yukon
 

Jeez that is disappointing. I am not sure what area that you are in (sounds cold so must be way up North LOL) but I would be tempted to try to find an Independent Hybrid Specialty shop and let them do a diagnosis. Sometimes plain ole common sense and experience in dealing with multiple similar vehicles will be stronger than a GM Cubicle monkey specialist that has only seen a Hybrid vehicle from a distance..................

Re: Service Hybrid System 2013 Yukon
 

Update: I am still getting "service hybrid system" on the DTC, but it clears and stays off for the drive with the check button. I don't get any other symptoms, but the symptoms I did have are no longer there. I disconnected the 12V battery for 15 minutes in a warm, 60 degree, garage, but the message is still there. Next is to disconnect the 12V then the 300V emergency disconnect to see if the Serial Data Gateway Module resets. It hasn't been above 51 degrees for 24 hours yet so I don't know if it will clear when the temperature soak is high. The dealer says the SDGM is bad and needs to be replaced, but they are no longer produced so a new one would have to be built for $500+. I can get a salvage one for $100, but they will not program it. The GMC customer care division would not refer me to an engineer that is familiar with the system and said I had to go back to my dealer. This is ridiculous. Since I am not seeing any other symptoms I guess I just have to live with the error message.

Re: Service Hybrid System 2013 Yukon
 

Have you ever noticed hard steering effort when it is on?

Re: Service Hybrid System 2013 Yukon
 

Nope no other symptoms. In fact today it was above 51 degrees and message still came on. I think it is ghost message and entire system needs to be cleared of all history. I'm hoping if I disconnect all power from the computers for a period of time they will all reset, but I'll bet there is non-volatile memory involved.

Re: Service Hybrid System 2013 Yukon
 

Hi! Had same problem week ago. Message "service hybrid system " has been on dash mornings only, than it start showing up every 30 min or so. Dealer found Sgm b1000-39 code and quoted me 1400$ to replace Serial data Gateway module and they need to order part also. I were not able to found new module, seems like there's now one in county has it, so I ended up pulling one from wrecked hybrid tahoe and my friend did programmed it for me. Replacing took 40 min and used module cost me 50$
https://cimg0.ibsrv.net/gimg/www.gre...6d3546e0cd.jpg
https://cimg2.ibsrv.net/gimg/www.gre...734c2ac1b9.gif

Re: Service Hybrid System 2013 Yukon
 

Ivan, did you go through this bulletin with your dealer? https://gm.oemdtc.com/TSB/SB-10057008-5045.pdf

After the dealer replaced the APM per the bulletin the repeated messages during the day went away. Now all I have is a one time message at start up that is cleared and never returns regardless of temperature unless I have to restart. I disconnected the hybrid battery and the 12V battery overnight and it did not reset. I'm pretty sure this is a residual message in history, but the dealer says it is the SDGM. Doesn't it require the GMC computer to program the SDGM? The dealer will not program a salvaged one and wants, like you said, over $1000 and would have to have one manufactured.

Re: Service Hybrid System 2013 Yukon
 

Hi! No, I never seen that bulletin. Guy with laptop, universal programer and gm soft subscription can program with no issues. Mechanical replacement is even easier. Ask your dealer how long it would take to get new module, since I didn't found single new one in whole country.

Re: Service Hybrid System 2013 Yukon
 

I know this is old but hopefully can help someone else - I had the same code (B1000-39), ordered the module listed above from local dealer (had it next day), installed it and had dealer program for $155. Fixed the issue and the car is back on the road!

Re: Service Hybrid System 2013 Yukon
 

Just wanted to update this thread. Still have "Service Hybrid System" on DTC, but no other systems and message is cleared every time I start it. I can't get a dealership nor GM to clear the code at no charge.

Re: Service Hybrid System 2013 Yukon
 

lvflyer, are you still having the "Service Hybrid System" on DTC come on, did it finally go away or have you seen any other trouble? Also in one of your posts above you referred to symptoms going away after the APM was replaced "battery voltage". Were you referring/watching the 12 v battery voltage on the DIC or the Hybrid battery voltage through an ODBII app? My 2013 Yukon that ,SKeith ran a grid on my battery data and said it is the best he has ever seen on a used GM battery at 120k, Data looks like a new battery. It has posted the "Service Hybrid System" on DTC about 6 cold mornings (51 degree today, but mostly 20-30 F) now over the last 3 weeks. It goes away on its own as the car warms up. The next day is warm and it does not happen. Never had any other symptoms ie: brakes, steering. mpg about 18-19 in town, heavy foot: hwy about 20-22 mpg. 12 V battery is 14 months old but reads 12.48 and 12.50 v on two different meters, resting overnight.

Comments or pontifications (SKeith) welcome

Re: Service Hybrid System 2013 Yukon
 

When you get an indication, what is the actual code?

Re: Service Hybrid System 2013 Yukon
 

Yes I still get "Service Hybrid System" on DTC every startup. Clears with button. No other symptoms. Prior to APM replaced under extended warranty the only time the "Service Hybrid System" message ever came on was when it was below freezing and then would only come back if restarted and below freezing. I didn't have any other symptoms. Now the message appears regardless of the temperature so it leads me to believe it is something they did at the shop. I had a guy do a quick check for the codes that were locked in and tried to reset them and sure enough there are codes for the Serial Data Gateway Module that wouldn't stay cleared. I opened up the dash and unplugged then plugged back in after squirting some contact cleaner on the plug to the SDGM, but the codes would not clear. Since the guy reading the codes did it as a quick favor I was not able to get the details on the codes. So I am stuck with a message when I start up.

Re: Service Hybrid System 2013 Yukon
 

I have no registered codes on mine through Torque or Carista apps. Just the "Service Hybrid System" on DTC at start up then it goes away.

Just went out and checked DIC temperature 55 degrees. Started it and NO "Service Hybrid System" on DTC message.

I may run it up to O'Reillys today.

Re: Service Hybrid System 2013 Yukon
 

The codes aren't readable except on high end scanners. They are deep in the system. Sounds like you need to take advantage of the extended special warranty. May be like pulling teeth though. https://testing-public.carmd.com/Tsb...06332/6bdde953

Re: Service Hybrid System 2013 Yukon
 

Ok- No codes on Torque or Carista or O'Reilly's fancy New Bosch reader. Pictures attached. I am taking all these to the dealer with the APM repair bulletin lvflyer sent me. See if they will replace the APM based on this and ask them to confirm software is up to date and clear codes. May be a few weeks before I can advise. Lots of travel for work. Stay Tuned.

https://cimg4.ibsrv.net/gimg/www.gre...ace2a8eda4.jpg
Dash on 2/21/20 35 degrees. once warm it went away

https://cimg5.ibsrv.net/gimg/www.gre...6c10713ddb.jpg
Torque app - no faults

https://cimg7.ibsrv.net/gimg/www.gre...afa411d4f8.jpg
Carista app - no faults

https://cimg6.ibsrv.net/gimg/www.gre...6b5cd4de3d.jpg
Torque app - Hybrid battery info

https://cimg8.ibsrv.net/gimg/www.gre...670a08d95f.jpg
Two month old O'Reilly's store near me, Bosch codes reader - No Faults

Re: Service Hybrid System 2013 Yukon
 

I recently had a ABS control module go bad (09 Tahoe) and despite the dire warnings of a used unit having to be "programmed" to match the vehicle I bought a used one at my local salvage yard and installed it. NO PROGRAMMING required works just fine.
Not sure if you would have that good of luck with this module that you need. I have noticed lately that we appear to be in what I call a "Golden Age Opportunity" for used GM Two Mode hybrid parts. A lot are showing up on salvage yards as they age out and the parts are reasonably priced at least around my area.
If this were my vehicle and I coul narrow the issue down to a module I would probably just trade in a used module from a matching vehicle on the cheap. Note: if your vehicle blows up (doubt it lol) don't blame me if something happens, just telling you what I would do.
Oh one other thing that might be worth checking is the reservoir for the Hybrid cooling system DCMC. Since this seems to be temperature related it almost makes sense that the cooling reservoir may be right at the minimum and then drops below when cold, setting off the low level light? When the system coolant warms up and expands after a while of running and turns off the dash warning light?
Good Luck.

Re: Service Hybrid System 2013 Yukon
 

I will be interested to see what they find and compare. It took 4 trips for me. First trip they said it was the 12V battery. Still under warranty so no charge. Then after I replaced that they said even though it had the symptoms described they said it showed the Serial Data Gateway Buss was bad, but they went ahead and ordered the APM and seal to replace under special warranty extension. Third trip to get it replaced at end of the day they called and said they couldn't do it because the only person certified to work on hybrids was tied up all day so had to make another appointment. So fourth trip and all day they still didn't have it finished and had to pick up the next day. Suppose to be a 2 hour job. Then when I picked it up they said they couldn't clear the SDGB codes and said they didn't make them anymore and would have to have one made for $4,000. They said they wouldn't program and used one. So here I am having to clear the message every time I start up.

Re: Service Hybrid System 2013 Yukon
 

I have changed out modules on vehicles and not had to get the module programmed. Key is to find a nearly identical donor vehicle to yours. On used parts it will already be programmed and will most likely work. I had a 2006 Mercury Montego where the LED tail lights were bad. (cannot find the LED tail lights for less than 700 per side!) went with a Ford Five Hundred donor vehicle at PullAPart. I swapped in the standard tail lights off the Five Hundred and they fit and plugged right up but the tail lights would not work so I swapped in the Ford Five Hundred SDGM module and the tail lights worked. Cost me 75 bucks for all the parts.
I gave the car to my brother in law and he has been driving it for over a year.

Re: Service Hybrid System 2013 Yukon
 

My 09 Hybrid as just recently displayed the service battery system and the power steering went out. Did you find a solution?

Re: Service Hybrid System 2013 Yukon
 

So how did this work out. I can't find a Serial Data Gateway Module so still clearing message on DTC.

Re: Service Hybrid System 2013 Yukon
 

you guys suck at looking?

has it occurred to you to type in the part number into google?

https://www.gmpartsdirect.com/oem-pa...odule-25883951

Re: Service Hybrid System 2013 Yukon
 

This item is a Special Order Part. Most special order parts will generally ship from our warehouse within 48-72 hours but may take up to 7-10 business days based upon their availability from General Motors before shipping from our facility in North Carolina. For parts availability questions please contact us at customerservice@gmpartsdirect.com.

Re: Service Hybrid System 2013 Yukon
 

https://www.ebay.com/sch/i.html?_fro...83951&_sacat=0

looks like a couple of sellers have them on hand ebay is really picky on this thing

Re: Service Hybrid System 2013 Yukon
 

Well all, sorry for my delay on this. So as I said back in February I had lots of travel for work. I did until March 8th, then this COVID thing happened and no travel but also no visit to the dealer . That said I have nothing for you. As I have commented before the Service Hybrid System comes on at lower temperatures on my 2013 Yukon. Texas is warm now and it has not come on again since February. 3 system checks with 3 different devices said no codes so I am going with that for now.

On another note - It seems that while idling in electric mode, my wife seems to think it has a louder than normal "whining" sound coming from the engine area. Any thought? or others with an experience like this.

Re: Service Hybrid System 2013 Yukon
 

call them and ask if they got it

legally they should not offer a product they actually don't have in stock..

Re: Service Hybrid System 2013 Yukon
 

no that is the sound from the Battery Blower I suggest cleaning it out if you have not ever done that

the Seal tends to blow out and the blower fan for the BATTERY is VERY loud in high mode it's about 500-600CFM and if the seal is leaking air you will get sound from it



as the idiot designers made the exhaust vent undersized compared to the fan speed(CFM) and intake size(Think electric leaf blower speed output)


if you take off the exhaust vent it's about 500CFM and the exhaust exit is tiny even worse is the external exhaust vent is even smaller
the output port under the passenger side muffler ( to the right )..
so you end up with a seal blow out.. overtime


in high mode it's very loud without the cover on about 90db


also if it's on High mode make sure the air is actually leaving the SUV my exhaust flapper got stuck closed I was able to free it up

Re: Service Hybrid System 2013 Yukon
 

are you talking about the blower inside the car under backseat? I am talking about a whining sound outside the Yukon and it sounds like it is coming from behind the front right wheel. Is there an exhaust flap under there ?

Re: Service Hybrid System 2013 Yukon
 

is the A/C on? when it makes the noise
if off...

the noise could be a worn idler pulley squeaking(or the belt chirping )..(only has a water pump on the belt)... I thought about Going all electrical ... and deleting the belt system and mechanical water pump bit pricey but might be an option when the pump fails



on the blower in the back seat (battery) that is also a source of noise in the cabin.. as the seal goes out (going to see if homedepo or lowes has like 1mm weather stripping to reseal that)

Re: Service Hybrid System 2013 Yukon
 

When dealing with a temperature related warning message issue it could possibly be related to fluid contraction / expansion. (pressure/temperature relationship) I am going to do a WAG here and say that the poster simply has a slightly low cooling reservoir for the inverter pump coolant..................in cooler temperatures the coolant level drops just enough to set off the low level sensor, after it warms up the fluid level climbs just enough for the sensor to go off! Could it be that simple???? Has the Forum crew figured out this problem????

WWSBD (What Would Sling Blade Do) Hahahahahaha

Re: Service Hybrid System 2013 Yukon
 

OK looks like this part number is for a wide range of GM vehicles. So if I find one in salvage yard will I have to get it programmed to my vehicle. Local dealer won't do it.