I was driving and while turning into a parking lost my vehicle lost power. The car still was mobile but at a very slow pace. I pulled into the bank and turned off the car. I cranked the vehicle up and it worked just fine. However, I have been noticing for a week the car has been losing a little bit of power while driving for about a second and then works fine. What could be the issue?
2006 Hyundai Sonata Throttle Position Sensor
As a Hyundai Tech, I have to say I 100% agree with Hyundai Guru. The 2007 Sonata is know for TPS faults, and it is very common for them to have a fault and then work fine after a restart. You'll probably have a Throttle Position Sensor 1 2 Voltage Correlation code as well as a Forced Limited Power P2135. You will need to go to a Hyundai Dealer as, as he mention, the new TPS will be useless without the ECU upgrade along with it.
2007 Sonata's have a known problem with TPS (Throttle Position Sensor). As you have explained, it sounds typical to be related to this. What happened is that the TPS faulted out and caused the engine to lack power. The computer have the capability when this happen to get the engine into a Limp home mode bypassing the TPS and through a safety channel to inject little gas to allow the vehicle to be driven with max 20 miles/hr until is driven to a service station. If you shut off the engine and restart it, you are resetting the TPS to its initial values and might go back to its proper function however, you will still feel lack of power from time to time until you replace the TPS. Dealer must do this because it comes with a new computer software to support the new TSP style. If the Check engine light is ON, just have it scanned to confirm the problem is related to TPS (fault code P2135) ****EDIT**** Is it a V6 engine? ****EDIT 2**** YEAH. I would say 99% that this is your problem. It might be out of warranty due to mileage but the price of TPS had been dramatically reduced due to high volume of repairs they had and you can buy one for less than $80 plus local applicable taxed. Labour to install and reprogram should be around $100.00 Is well worth to fix it right. Go to Auto Zone to pull the fault code out. They'll do it for free. If it comes out with P2135, just go to Hyundai dealer and have it fixed right. Without the new software, the new TPS will not function properly. Good luck. ****EDIT 3**** Just to argue with LTs theory (not that he's wrong) a clogged fuel filter will always cause the engine to run rough. Will never revert to normal engine performance after a restart. I have seen too many TPS sensors replaced and the cause of failure based on your correct description is too well known to me as a typical failure. We both, (me and LT) would be really appreciative if you update with what the real problem was, after you find out. Best regards.
I had this happen to me yesterday (2006 V-6 Sonata 78k miles). Wife and I hopped on I-95 and when I went to punch it, the bottom fell out (power wise). Check Engine light came on, ESC got turned off (and couldn't be put back on). I thought the engine had died but it was just a severe lack of power. Was able to maintain 60mph on the highway, but with such loss of power was wondering what happened once I lost that momentum at a red light. Get off the interstate, going thru town (back to our house) it would accelerate, very slowly, and I could get it back up to 60mph or so. I tried driving it manually shifting the gears, no matter what seems like I couldn't get more than 2,500 rpm and she was still a dog. We had just got gas before this happened so some thought that might be the problem. Before heading out to Advanced Auto to get fuel treatment (just in case) I decided to Google 2006 Sonata loss of power and saw this thread. So, ever skeptical, I go out to the car, turn it on and voila! everything is back to normal (except engine light still on). Hopefully this is the end of the story, I will find out more when I drive it later. But thank you thank you thank you for the helpful post Hyundai GURU! (been 5 years, don't know if you will still see this!).
Can only guess by not seeing the car but with what you say I would check the fuel filter first. You didn't say how many miles are on the car, but a tune up would be the second thing that come to mind. (If Hyundai Guru says TPS (Throttle Position Sensor), then I'll agree with him. But just so I don't have to agree with him completely, still check the fuel filter.))
