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2014 Q5 engine stumbles in the heat

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2014 Q5 engine stumbles in the heat

Old 07-18-2018, 05:17 PM
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Join Date: Jul 2018
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Default 2014 Q5 engine stumbles in the heat

I just joined this forum hoping to get some possible solutions to a problem we're having with my wife's 2014 Q5 2.0 Quattro with the 8 speed auto trans. We currently have 29,000 miles on it. The Q5 is back at the dealer for the 3rd time with the same problem. In Arizona it gets quite hot in the summertime. Three times we have been unable to complete trips in this car. Typical scenario happens when car is driving for more than an hour's time. We'll be driving down the road and the A/C will stop working.. not good when it is 108 outside. Shortly after that happens the car will start jerking and loose engine power then come back up with the engine power shortly. We initially thought it was the transmission jumping in/out of engagement it was that abrupt and that violent. Audi of America picked up the towing bill to have the car towed the 5 hours to get it to the closest dealer to our home. Dealer could find no codes, nothing wrong but opened an issue with Audi. A few months later my wife and a friend of hers were heading to San Diego from Tucson. Just outside of Yuma, at 112 degrees, the AC stopped working and the abrupt power loses/power restore cycles began and continued until the got to the Audi dealer in San Diego. Dealer said Q5 was out of refrigerant and serviced the AC unit and added dye. They made the 400 miles back home safely with no further issues. It was not quite as hot on the return home.
Last week we had 4 people in the car and drove from Tucson to Phoenix without issue. On the way home, 20 minutes out of downtown Phoenix the AC stopped working, it was 102. Within 15 minutes the power loss jerking started again. Nothing like passing a semi at 75, pulling back in the lane in front of him and loose all throttle response. Pressing on the accelerator makes no difference....there is no power there. The tach slowly goes down but never under 1000 RPMs. This happened the rest of the 125 miles home. We ended up leaving the car in a parking lot in town as the problem had gotten worse and we felt it presented a safety issue trying to drive home. We had a friend pick us up and take us home. In the cooler morning weather the next day the car started fine and I drove it to the Audi dealer. It is on it's 5th day at the dealer. Over the last year the dealer has applied a few TSBs related to heat and the fuel delivery system per Audi engineers, but to no avail.
I have no issue with the dealer as I feel the dealer is exercising due diligence to remedy the problem and is leaning on Audi for support. I was wondering if anyone else had been through this scenario and found a solution?
Sorry for a long 1st post but it is frustrating to have a beautiful car and not be able to use it for long trips. That is why we bought the car. TIA
Old 08-08-2018, 10:28 PM
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Join Date: Aug 2018
Posts: 3
Default Similar issue? Possible fuel pump??

My car died on a road trip outside of Barstow California. It was 111 degrees outside. Same scenario with the car moving along fine and then just dying, then waking up again and able to accelerate again. This happened a few times outside of Vegas (headed to LA). Then started happening more and more until the vehicle was officially stopped on side of road.

It it was towed to Audi Onterio CA and they have had it for 6 days now. They just called today and said it was a fuel pump and would come st 790$ to fix. BUT, it will not be in for another 7-10 business days.

I called my my local dealer in Denver and they said there was 20 cars at their facility waiting for the same part.

Q5 drivers... is this a known problem with a fuel pump or a fuel pump problem in extreme heat? Why is there a shortage of this part and people across the country in loaner cars? Is there a recall that needs to happen.

Im in a 2014 Q5 2.0 with 55,000 miles (naturally jyst barely barely past warranty) 🙁
Old 08-09-2018, 11:52 AM
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Join Date: Jul 2018
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Hi Gishy. The Audi dealer had our Q5 for 13 days awaiting the new style fuel pump from Germany. This is the same fuel pump part number that is used in some of the VW cars. Apparently the fuel pump in the Q5 is located in an area that is subjected to high heat that can vaporize the fuel in the fuel line if the pump is weak and if there are high ambient temperatures. Looking at the final repair write up on our Q5, the fuel pump should deliver 1 liter of fuel every 15 seconds. Ours was putting out .4 liter every 15 seconds. So instead of putting out 4 liters per minute, ours was putting out 1.6 liters per minute, less than half of what it should deliver. This leads to vapor rather than liquid being in the fuel line and causes the "chugging" sensation while driving until it just dies out.
We had the new fuel pump installed and will be testing it soon on a hot weather trip to Phoenix and back. Dealer is highly confidant this will fix our issue. Although out of warranty by a month, the dealer covered our repair as this was the third time in a year the car was brought in for the same issue and it had under 30,000 miles on the car. Plus, this is a known problem on the Q5. Maybe you can push that a bit with your dealer.
I am satisfied with the service and attitude of our Tucson Audi dealer.

Last edited by Q5Jeff; 08-09-2018 at 11:54 AM.
Old 08-10-2018, 03:02 PM
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Join Date: Aug 2018
Posts: 3

Thanks for the reply!
You know when I think about it, the only other time I remember that chugging feeling was when I was driving through Death Valley and it was 124 degrees that day.

Makes me start to think that Audi engineers need to figure out the Q5 and its ability to function in extreme heat.

The dealer in Onterio CA let me know they found a part so I should be back on my trip in another day or two.

Im overall pleased with Audi and specifically the dealership in Ontario CA, BUT, this is sounding like an issue that is more of an engineering problem that they need to figure out on future models.
Old 09-01-2018, 02:00 PM
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Join Date: Jul 2018
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Default New fuel pump

The new fuel pump has been installed in the Q5. As a test, my buddy and I drove it to Phoenix where it was 109 degrees. We shopped at an electronics store for a few hours then drove to Tempe for lunch. We spent about an hour at lunch, plenty of time to heat soak the engine. We then drove from Tempe back to Tucson where it was 102 degrees. The last 12 miles was following a wind farm post being escorted in two lanes by 4 highway patrol cars....we followed behind at 25 to 35 mph. Not a glitch or a hiccup from the Q5!
The new fuel pump fixed our high temperature lack of fuel problem!
Gishy, I hope your new fuel pumped corrected your issue, too.
Old 09-11-2018, 12:09 PM
SoCal Crew Member
Join Date: Nov 2006
Location: SoCal/ Norcal
Posts: 2,317

Curious if the battery was ever replaced with a non-audi battery and not properly coded. ...I 've seen some weird issues come about from an aftermarket battery.
Old 09-15-2018, 02:05 PM
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Join Date: Jul 2018
Posts: 4

No, Our Q5 still has the original battery.
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