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YUKON Service Hybrid System/Service Power Steering

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YUKON Service Hybrid System/Service Power Steering

  #1  
Old 12-12-2017, 06:43 AM
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Default YUKON Service Hybrid System/Service Power Steering

Good morning,
I have not had any luck finding any information online for the errors I am receiving on my 2010 GMC Yukon Hybrid. For starters, it has 113k miles on it, bought used. We first started noticing a message on the dashboard reading "Service Hybrid System", but no other big issues. This error comes and goes, mostly appears after accelerating from auto stop. Sometimes the accelerating seems like I am about to run out of gas, is the best way to put it, like it is thinking really hard to accelerate. Also, if I come to a complete stop when the dash read "Service Hybrid System", the car will completely shut off and throw the error message "Service Power Steering". I have to turn the car off and then back on. In extreme cases, I have to reset the engine battery. I never have issues with power steering, so the error message is a little confusing.

Things we've done to try and fix this:
We've completely recycled every cell in the hybrid battery. All cells are reading within the range they should be. As far as I know the hybrid battery has not been replaced.
All fuses are fine.
Checked power steering motor.

We are taking it up to the GMC dealership this weekend to scan for codes and get a diagnosis.

Has anyone had this issue before or can anyone point us in the right direction?

Thanks!
Nicole
 
  #2  
Old 12-12-2017, 07:41 AM
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Location: Mesa, AZ
Posts: 2,893
Default Re: YUKON Service Hybrid System/Service Power Steering

What DTCs were reported?


What does "completely recycled every cell in the hybrid battery" mean?


When you say, "all cells re reading within the range they should be," what does that mean? I've processed thousands of modules, and I can tell you that it takes me at least 2-3 weeks and about 8 hours of touch time to make that statement.


Are you telling us that you pulled the battery and checked all 40 modules without reading the DTCs?


The acceleration performance issues you describe are highly indicative of a failed hybrid battery.
 
  #3  
Old 12-12-2017, 08:26 AM
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Default Re: YUKON Service Hybrid System/Service Power Steering

My husband would be able to better answer that, but yes, we took the hybrid battery out and checked all 40 cells. It took him about 2 weeks to go through the whole process. Even cleaned every connector and all cells appeared to hit the correct voltage/amps and were insync after it was all said and done. He is VERY proficient in all mechanical issues, but the hybrid game is completely new.
We have a code reader, but not one that can give us accurate codes for this make/model. A hybrid mechanic in our area even told us that he is unable to obtain the computer software from GMC to read these codes. The GMC dealership is the ONLY place in our area that can provide us the DTCs, and just that alone is $300-400....so yeah, we did this without getting true DTCs.
 
  #4  
Old 12-12-2017, 08:40 AM
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Default Re: YUKON Service Hybrid System/Service Power Steering

First, I find it astounding that someone would opt to go through that without trying to get the DTCs. The majority of consumer grade readers mostly suck when it comes to hybrids. I have found that O'Reilly has substantial success in reading codes from all hybrids due to their use of Bosch brand code readers.

The aforementioned 2-3 week timeframe also requires about $7000 worth of custom equipment, 3 years of experience testing thousands of modules, and the ability to move about 300A of current at 11-15V (about 4000W of power).

"Correct voltage/amps and were insync" is meaningless unless you have the experience and equipment to make that determination.

The only information you have provided points directly at a hybrid battery failure; however, the only prudent course of action is to check out the 12V system to make sure it's 100% working. 12V battery holds voltage AND passes a load test, then proceed directly to O'Reilly to try and read codes (they can check your 12V too). If that doesn't work, to the dealership you go.

If you would like to involve your husband and provide the data he collected, I would be happy to evaluate it and provide useful feedback. However, I will need to understand exactly what was done in detail.

Good luck,

Steve
 
  #5  
Old 01-16-2019, 03:50 PM
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Join Date: Jan 2019
Posts: 1
Default Re: YUKON Service Hybrid System/Service Power Steering

Dear Team,
My GMC Yukon 2008, recently, since 2 months ago during in driving the "Service Power Steering" appears on the dashboard sometimes and the steering becomes hard to drive (i mean difficult to turn). Then when i turn off the car and turn it on again it disappears on dashboard and appearing again in few minutes. Can someone help me and explain it to me? Should i replace the power steering electric motor or something need to do?
 
  #6  
Old 02-26-2019, 03:19 PM
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Join Date: Feb 2019
Posts: 3
Default Re: YUKON Service Hybrid System/Service Power Steering

Originally Posted by S Keith View Post
First, I find it astounding that someone would opt to go through that without trying to get the DTCs. The majority of consumer grade readers mostly suck when it comes to hybrids. I have found that O'Reilly has substantial success in reading codes from all hybrids due to their use of Bosch brand code readers.

The aforementioned 2-3 week timeframe also requires about $7000 worth of custom equipment, 3 years of experience testing thousands of modules, and the ability to move about 300A of current at 11-15V (about 4000W of power).

"Correct voltage/amps and were insync" is meaningless unless you have the experience and equipment to make that determination.

The only information you have provided points directly at a hybrid battery failure; however, the only prudent course of action is to check out the 12V system to make sure it's 100% working. 12V battery holds voltage AND passes a load test, then proceed directly to O'Reilly to try and read codes (they can check your 12V too). If that doesn't work, to the dealership you go.

If you would like to involve your husband and provide the data he collected, I would be happy to evaluate it and provide useful feedback. However, I will need to understand exactly what was done in detail.

Good luck,

Steve
hi if you would be able to help me out as well
my truck was running fine a day before and the next day it just wouldnt start,the service hybrid system message comes on but it won't crank over or do anything but kill my battery after a few tries, i thought ot would be my battery so i bought a new one and tries it. No luck. I havnt really done anything about it due to kot having money atm but any help would be appreciated
 
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