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2008 Tahoe Hybrid Codes POAC4 and P061B
I'm having a problem with my Tahoe Hydrid Stalling out. It happens when the engine switches from Electric mode to Gas pode particularly at a stop. The codes that show up ar POAC4 and P061B. I've taken the vehicle to the dealership numerous times and they were not able to fix it. First time they said the throttle body was dirty and it needed to be cleaned. That didn't fix it. Next time it happened they said the batteries were no good, but they couldn't work on the Hybridhttp://images.intellitxt.com/ast/adTypes/icon1.png since the gloves that they use to work on Hybrid batteries had Expired. Then the next time it happened they said it was the Catalytic Converter...that was change and it still did not fix the problem. I took it in the last time just recently and they reflashed the ECM and said they still don't know what is causing the problem...they supsect it is the aftermarket wheels and tires that is causing the vehicle to stall? The advisor said that Hybrids are very sensitive when it comes the the computer and torque calculation. Does anyone have any idea of what it causing this problem???
Thanks in advance. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Originally Posted by ponsta12
(Post 245482)
they supsect it is the aftermarket wheels and tires that is causing the vehicle to stall?
What size wheels and tires are you running? I had 24s with 295/35s on my 09 and never got any of these issues. Unless you're running something massive, it sounds like a lot of nonsense to me from service staff who are clueless as to the root cause. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
I have 305/50/20 on my Hybrid, yeah, I think it's just an excuse or another way of saying they don't know what they're doing.
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Yeah that's nonsense ... the Escalade and Denali hybrids come with 22s, which are likely heavier than the 20s you got on, and their tire size/diameter is practically identical compared to yours.
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
It appears you may want to show your dealer this service bulletin of code P061B, (HYBRTD)slip' stall At A stop, surge, Lack of power, poor Fuel
Economy, with or without DTC pO61B, POAFA (Sep 7, 2010) http://www.google.com/url?sa=t&rct=j...KIe8gTZPoBGSDQ Also googling code POAC4 came up with some good information to know that was found on the this very helpful website forum GreenHybrid.com along with the service bulletin above.:thumbs_up Starting with post number 15 discusses code POAC4, https://www.greenhybrid.com/discuss/...97/index2.html P.S, i'm running 22's and the only thing it affected was the comfort level of the ride and not a whole lot of fuel. ;):cool: Hope this helps, good luck.:) |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Originally Posted by ponsta12
(Post 245482)
I'm having a problem with my Tahoe Hydrid Stalling out. It happens when the engine switches from Electric mode to Gas pode particularly at a stop. The codes that show up ar POAC4 and P061B. I've taken the vehicle to the dealership numerous times and they were not able to fix it. First time they said the throttle body was dirty and it needed to be cleaned. That didn't fix it. Next time it happened they said the batteries were no good, but they couldn't work on the Hybridhttp://images.intellitxt.com/ast/adTypes/icon1.png since the gloves that they use to work on Hybrid batteries had Expired. Then the next time it happened they said it was the Catalytic Converter...that was change and it still did not fix the problem. I took it in the last time just recently and they reflashed the ECM and said they still don't know what is causing the problem...they supsect it is the aftermarket wheels and tires that is causing the vehicle to stall? The advisor said that Hybrids are very sensitive when it comes the the computer and torque calculation. Does anyone have any idea of what it causing this problem???
Thanks in advance. Best, Katie GM Customer Service |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Katie, I just sent you a private message.
Thanks everyone for their help. The TSB was really helpful...I may be on the right track to getting this problem fixed. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Thanks for the heads-up, ponsta! I'll be replying shortly and look forward to working with you.
Best, Katie GM Customer Service |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
p, keep in mind that the solution to this might be that the truck might need a new hybrid HV battery.
This of course might explain why the dealer blamed your wheels. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
I was thinking that too, but why would they blame the wheels if it needs a new battery? It should be under warranty correct?
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
It would, but some dealerships just don't want to deal with it.
Let's put it this way, it's either that or they're incompetent. No way you should have to be the one to uncover the relevant TSB. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
After sending the TSB (which describes the exact problem that I am having) the service advisor replied that it is for 'stock vehicles' and he still maintains that the oversized tires that I have on there are the cause of the problem. Also referring to the problem that I am experiencing, he stated that 'We are not experiencing that problem as of yet'. I don't think they have even tried to duplicate the problem. Now they want to charge a rate of $105/hr to perform the TSB. Does anyone know if I have to pay for repair work stated in a dealer issued TSB.
Anyways, I don't think these guys know what they are doing so I have contacted GM service to see if they can help. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Print and hand them a copy of the Magnuson–Moss Warranty Act and ask them to provide proof that your wheels have a direct causal affect on the issue. Advise them that should they fail to do so, you will pursue legal action.
I hate dealers like that, trying to scam customers out of every dollar. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
I sent an email to my service adivsor to see if he could provide proof that my aftermarket wheels and tires are the cause of the problem and if he had tried to duplicate it, he replied:'No I cannot provide proof. We have not duplicated your issue, only saw the history codes. If this problems only happens once in a while, it will difficult to duplicate'
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
They have the codes, they have the TSB addressing them, they cannot provide proof of causality between your wheels and issue.
Hopefully GM CS will step up and set this dealer straight, otherwise ... |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
OK guys. All that matters other than un-sprung weight is RADIUS or revolutions per mile.
Stock 265/65/18 according to http://www.discounttire.com/dtcs/infoTireMath.dos has 639 rev/mile. New 305/50/20 has 630 rev/mile 9/639 = 1.4% Difference. No way can the base vehicle tell the difference. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Just an example,
Standard tire size for 2013 CADILLAC ESCALADE HYBRID 4WD: (in case of different tires in front and rear the dimensional data are valid for driving or rear wheels) Standard tire size: 285/45 R 22 Tire width (mm): 285 Tire sidewall factor: 45 Rim size (in): 22 Total wheel diameter (mm / in): 815 / 32.1 http://www.automobile-catalog.com/ti...ybrid_4wd.html How many miles do you have on you're tahoe Hybrid ? and did you get an extended warranty? Also the hybrid Original Manufacturer Warranty should read like this, Warranty 36/36,000 Basic (mths/miles): 60/100,000 Powertrain (mths/miles): 72/100,000 Corrosion Perforation (mths/miles): 60/100,000 Roadside Assistance (mths/miles): 96/100,000 Hybrid Electrical Components (mths/miles): http://www.cars.com/gmc/yukon-hybrid/2008/warranty/ http://www.chevrolet.com/owners/warranty.html Maybe you should find a new dealer. Do you have a GMC dealer nearby you could try? Maybe send the service writer this forum so they'll have a chance to learn a few new things about the Hybrid system.:shade: |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Approximate mileage is 76K. I purchased the vehicle used and also purchased an aftermarket warranty.
As of today, I've contacted GM CS and they said they are going to contact the dealer. I'm expecting a call back tomorrow afternoon. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Pon, if the dealer did NOT clear the stored codes from last visit, there should be more information IFF they dig just a little bit deeper. When many codes set, a specific list of vehicle operational parameters are stored in something called a Freeze Frame. GM can use this to pinpoint what was going on when the code set.
The problem is. Most old wrenches... like me... will get in a habit of clearing everything and "let's see what comes right back". OK that works good on my old Lumina with a bad O2 sensor. The check engine light comes back in less than 5 minutes. Hybrids are different! Way different! A code like what made yours quit may only come around once in a blue moon after planet alignment and solar flares. So P0AC4 just means that the hybrid master computer told the engine computer to turn on the light. If the request came from the transmission computer it would have P0700. The engine computer still has the ONLY wire directly to that light. Legacy technology from when the engine was the lead dog. Next step. We see a request for the light. OK. Who sent it? Hybrid. OK. Why? The dealer can go deeper than the guys at Orilleys and get the freeze frame from the hybrid computer and others. They need to learn to do this FIRST. Service guys... First the interrogation, then you can dispose of the wittnesses. There are data parameters in the hybrid freeze frame that could point straight to the battery if that is the problem. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Why aren't dealers better trained to handle these types of issues? Why is someone like the op resorting to Internet forums to get some semblance of real help? Pretty poor showing on Chevys part if you ask me. I know how it is a bit of a relationship thing but man these are cels we are taking about not some mysterious whistling noise being diagnosed.
Curious to see how this is ultimately handled. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
CYK, Training is available. The old lead the horse to water thing. The "store" owner, service manager, and ultimately the mechanics all have a part to play. There are store owners out there who don't want the new electrified products. Others can't get the new technology fast enough. I have worked in dealerships for Ford, GMC, Oldsmobile, Chrysler, Dodge, Jeep, AMC, Mitsubishi. Some put great emphasis on certification and specific product training. Others were well... MEH.
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
my disclaimer here is that i don't know the op and can't speak to the condition of his chevy product and do note that he is not the first owner. i see more decrepit "new" vehicles than well care for ones so i can semi-understand how service centers must manage expectations.
with that said i understand where you're coming from, but as someone who's not a brand fanboy, i've had the chance to visit with bmw, honda, porsche, lexus, toyota service centers with each car in my care under factory warranty (all w/ aftermarket wheels + more) and i'll say that each brand center has been consistently on point on fixes both mechanical and electrical in nature. the treatment that the op is getting is pi$$ poor at best. how the heck do they expect to have him buy another chevy product? do your research. access chevy tech. provide the client with some options toward resolution. be a partner in this and not just a transaction-based vendor dealing w/ client #123243454. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
It's not really about being a 'fanboy' ... I have owned all brands of luxury and non luxury vehicles and my experiences have been mixed. I've gone to dealerships of lower cost vehicles and gotten outstanding service and gone to Land Rover service centers that aren't qualified to wash a Yugo. Type in Rosenthal Jaguar/Land Rover in Vienna VA and have a gander at the reviews .. you're lucky if more stuff isn't broken than when you took the vehicle in and if your property is still in the vehicle when you collect it. Heck they've been known to take your tires and swap them for older ones whilst your car is in service.
Some businesses understand and respect the benefits of customer service and pride in their work, others do not. But it has little to do with brand name. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
you misunderstood me. my point wasn't that the other marques i've purchased from don't have their faults. you're not stupid, hyhoe, to think that someone would come into this thread pointing fingers at chevy as if they're the only ones who aren't perfect. no one is, no brand is.
my usage of word fanboy was to say that i'm don't have brand blinders on; rather, personally speaking, i've consistently had positive experiences with a number of car companies when it comes to service even with aftermarket wheels/mods. i buy what i feel is a great value. if i were to receive this same type of response for running my 285/45/22s coming in to figure out a CEL, i would strongly consider selling it and going back to something else that's more familiar. how a chevy center don't have trained techs to handle something so simple as investigating a CEL is a bit concerning. this ain't rocket science. the hybrid's been out in full size form since 2008. plenty of time to get things sorted. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Originally Posted by ponsta12
(Post 245518)
Does anyone know if I have to pay for repair work stated in a dealer issued TSB.
Warranty exclusions: Excluded from the powertrain coverage are sensors, wiring, connectors, engine radiator, coolant hoses, coolant, and heater core. Coverage on the engine cooling system begins at the inlet to the water pump and ends with the thermostat housing and/or outlet that attaches to the return hose. Also excluded is the starter motor, entire pressurized fuel system (in-tank fuel pump, pressure lines, fuel rail(s), regulator, injectors, and return line), as well as the Engine/ Powertrain Control Module and/or module programming. Unfortunately being an second owner can give the OEM warranty team a little wiggle room at saying sorry but we can not help you out. I hope this is not the case here, Good luck. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
the hybrid component warranty is 8 years/100k miles which is transferable. either go to another dealer that services hybrids. go to a caddy dealer. they will have the same know how since they have basically the same hybrid components.
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
UPDATE: GM service contacted me and said a District Specialist would contact me within 24 hrs. District Specialist contacted me the following day (Friday)...only to say the he was working on it and would contact me the next Tues afternoon. He also mentioned something about him going to be out for the holidays. He seemed more concerned about his vacation that taking care of the problem. So, Tues afternoon, NO CALLBACK from District Specialist!!! GM Customer Service is CRAP! I may have to take legal action if they don't want to do anything.
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
you need a little push to let them do it.
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Btw, something worth noting that I just found out ... GM subscribes to the BBB Autoline program to settle warranty disputes. This is mentioned in your owners manual. It is free to file a claim and it can go to arbitration if GM doesn't back down. It is not likely IMO that an arbitrator would allow GM to skirt federal law.
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Originally Posted by ponsta12
(Post 245630)
UPDATE: GM service contacted me and said a District Specialist would contact me within 24 hrs. District Specialist contacted me the following day (Friday)...only to say the he was working on it and would contact me the next Tues afternoon. He also mentioned something about him going to be out for the holidays. He seemed more concerned about his vacation that taking care of the problem. So, Tues afternoon, NO CALLBACK from District Specialist!!! GM Customer Service is CRAP! I may have to take legal action if they don't want to do anything.
Best, Katie GM Customer Service |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
UPDATE:
Finally, got a call back from GM after many days of playing phone tag. Customer Service didn't have any answers...told me to get a second opinion! Really??? I'm done with these guys. What a joke. Hybrid was acting up today again...put the car in Reverse and CEL came on and 'reduced engine power' and 'service traction' something??? |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
So take it or tow it to a different dealer and insist that they read ALL codes and obtain the Freeze Frames to send to GM.
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
I'm interested in a gm extended warranty .08 Yukon hybrid 112000 miles but new Gm motor factory installed. About what will that cost?
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I think GM warranty is only until 100k miles. you might need an aftermarket one.
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Correct only to 100,000 .aftermarket warranty $3000.seems like allot and $100 deductible .eeeeeks should I throw caution into the wind?
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I paid $3500 on majorguard gmpp and it did not cover the front shocks. make to read what is covered and what isn't.
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
any good news on yukon/tahoe hybrid issues? :(
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Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Originally Posted by ponsta12
(Post 245482)
I'm having a problem with my Tahoe Hydrid Stalling out. It happens when the engine switches from Electric mode to Gas pode particularly at a stop. The codes that show up ar POAC4 and P061B. I've taken the vehicle to the dealership numerous times and they were not able to fix it. First time they said the throttle body was dirty and it needed to be cleaned. That didn't fix it. Next time it happened they said the batteries were no good, but they couldn't work on the Hybridhttp://images.intellitxt.com/ast/adTypes/icon1.png since the gloves that they use to work on Hybrid batteries had Expired. Then the next time it happened they said it was the Catalytic Converter...that was change and it still did not fix the problem. I took it in the last time just recently and they reflashed the ECM and said they still don't know what is causing the problem...they supsect it is the aftermarket wheels and tires that is causing the vehicle to stall? The advisor said that Hybrids are very sensitive when it comes the the computer and torque calculation. Does anyone have any idea of what it causing this problem???
Thanks in advance. |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
Originally Posted by Twobillion Ks
(Post 262631)
Hello. I am having the exact problem you described. I was wondering how things turned out. Thanks for your time.
Below is just some additional basic info for POAC4 on the GM Hybrids, https://www.autocodes.com/search_codes.php?q=POAC4 <You'll need to scroll down.. Plus even though it doesn't really matter, there's one for Chevy, GMC, Cady, and others which is all almost the same but all the info combined is a little helpful to help understand the problem a bit better. P061B: From the following link regarding P061B is some copy and paste basic info, https://www.autocodes.com/tsb/gmc/sierra_1500/2008.html Bulletin Number: PIP-4686Bulletin Date: 09-01-2010Component: Engine and engine cooling:engineSummary Chevrolet/cadillac/gmc: hybrid driveability or customer concerns of flare, slip, stall at a stop, surge, lack of power, poor fuel economy, reduced ev range/limited electric propulsion, dtc p061b after campaign 09102b or dtc p061b prior toBulletin Number: PIP-4686Bulletin Date: 09-01-2010Component: Fuel system, gasolineSummary Chevrolet/cadillac/gmc: hybrid driveability or customer concerns of flare, slip, stall at a stop, surge, lack of power, poor fuel economy, reduced ev range/limited electric propulsion, dtc p061b after campaign 09102b or dtc p061b prior toBulletin Number: PIP-4686Bulletin Date: 09-01-2010Component: Power train:automatic transmissionSummary Chevrolet/cadillac/gmc: hybrid driveability or customer concerns of flare, slip, stall at a stop, surge, lack of power, poor fuel economy, reduced ev range/limited electric propulsion, dtc p061b after campaign 09102b or dtc p061b prior toBulletin Number: PIP-4686Bulletin Date: 09-01-2010Component: 061000 engine and engine cooling:engineSummary Chevrolet/cadillac/gmc: hybrid driveability or customer concerns of flare, slip, stall at a stop, surge, lack of power, poor fuel economy, reduced ev range/limited electric propulsion, dtc p061b after campaign 09102b or dtc p061b prior toBulletin Number: PIP-4686Bulletin Date: 09-01-2010Component: 070000 fuel system, gasolineSummary Chevrolet/cadillac/gmc: hybrid driveability or customer concerns of flare, slip, stall at a stop, surge, lack of power, poor fuel economy, reduced ev range/limited electric propulsion, dtc p061b after campaign 09102b or dtc p061b prior toBulletin Number: PIP-4686Bulletin Date: 09-01-2010Component: 103000 power train:automatic transmissionSummary Chevrolet/cadillac/gmc: hybrid driveability or customer concerns of flare, slip, stall at a stop, surge, lack of power, poor fuel economy, reduced ev range/limited electric propulsion, dtc p061b after campaign 09102b or dtc p061b prior to |
Re: 2008 Tahoe Hybrid Codes POAC4 and P061B
It sounds like when these two codes are offered together, a battery fix is necessary.
Interestingly, I can't get freeze frame data when my Tahoe jerks, freezes and shuts off, turning on the check engine light. By the time I can get to a dealer to get freeze frame data pulled, the light goes off, and no data is available. I don't reset it, it "fixes" itself. I need to find a local battery refresher. |
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