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I have a 2014 Hyundai Elantra GT that lost RPMs on a highway and I had it towed home and then to a mechanic once one was selected. My wife and I are religious about oil changes with our vehicles. didn't know about any open service bulletins before something happened. The mechanic said the engine is seized up and that the open bulletin and this might be related. I'm not seeing much data on the 2014 Elantra GT but I see there's a variety of vehicles being recalled with theta engines so maybe the problem is bigger than they want to admit and they are trying to find the vehicles that have an issue by using the software update?

reading this forum it looks like there's a large issue here and being called in for an update and then having the vehicle go into "limp home mode." indicates they know but were not prepared for the severity of it. Not the first owner obviously so I don't know it's history. It had a hurricane battery in it that didn't fit the battery compartment. It was suggested I check the battery and the battery was not holding enough charge to start the engine. the vehicle wasn't there and running so I couldn't have it plugged in at the auto-parts store to see the codes. When it broke down it was very hot, there was some smoke, and when I tried to start it there was a repeating pulse through the whole system. wish I had known sooner that the battery wasn't to spec but they had this black insert in the compartment and it never caught my eye. It was sold to me with the wrong battery so I might be experiencing an issue that isn't common for this service bulletin. My gut says it started as an electrical issue and became an engine issue. Literally all I know is the indicator lamp blinked briefly as I was driving then I was coasting with no power.

the benefit of the software update is for the car to put itself in a "protective mode."? The problem is there wasn't any feedback from the vehicle on what was happening. Maybe a newer model would have had an electrical monitor. used to have sprint drive in my car and when logged in you could see the voltage, oil temps, and other stuff available through the OBD-II port. suspect I might have known sooner if I still had that thing running. network service was not good at my last job so I changed providers. still have the device but I'm not sure how to use it without logging in to sprint's website. Own it even if it isn't on the network anymore.
 
I brought my 2014 Hyundai Sonata Hybrid in for the 964- AUXILIARY CANISTER INSTALLION & 966- ENGINE MONITORING LOGIC Service recall campaigns on 12/08/21. Today, 12/21/21, in heavy traffic on the highway, my car engine abruptly shuts off, immediately decelerating, completely losing any ability to accerate while the engine light, parking break light come on along with an "electric motor warning - safely pull over and do not drive" message on the dashboard. All this happens while a high pitch alarm goes off. All happening simultaneously without warning on the highway with vehicles surrounding us driving 70 mph! This has never happened prior to today and should never happen. How we managed to avoid an accident or worse was a miracle. This was life threatening and should not be taken lightly!
that's about what happened to me but there wasn't any warning that I was aware of. Lost RPMs and coasted into a parking lot. 2014 Hyundai Elantra GT. Do regular oil changes and I think I've had the car about two years. Discovered the battery wasn't the right size while trying to identify what was wrong. Mechanic told us to have it towed to the dealership because it must be throwing codes telling her it's related to this bulletin. She told my wife the engine is seized up. That's probably going to cost 90% of the car's value to replace and I'm not sure what happened. There wasn't any service indicator. I didn't see anything while I was driving to warn me it was about to shut off. It's been a good little car but I think it's a $12,000k brick now. If 3/4 of its value when I bought it is needed to repair it then I'll scrap it and start over.

We did our homework before buying it and I don't remember any of this in the lemon-aide guide. We also have a 2015 Toyota Sienna and I went online and made sure there weren't any open service bulletins because I'm going to be paranoid about this stuff. It sounds like some of us were lucky and some of us weren't. Wish me luck fixing my 12k dollar brick or replacing it.
 
People...I know that this is a semi-old thread, but I am posting as a warning.

We have a 2016 Sonata Hybrid. 2021 there were 3 recalls issued:
  1. 1 for an emissions sticker (the car might now pass emissions with the sticker from the factory)
  2. 1 for a new hose or a new belt (or something similar, I don't remember)
  3. 1 for possible engine failure due to the rods
Car went in to dealer June 2021. Items #1 & 2 no problem. Item #3 involved a stress test. What happens if the car passes the test: you all good, no new engine needed. Car fails? new engine needed courtesy of Hyundai. Our car passed...Yay (I'd rather have a new engine put in)

Labor day weekend...Road trip: 330 miles. Friday night 9/3 roughly 7:30pm and 200 miles into the trip (57,000 odometer miles), car starts flashing warning light: LOW WASHER FLUID. this warning continues for about 30 minutes, becoming more and more frantic (mind you, we are in the middle of no where and NOT using our washer fluid at all). Roughly 8:00pm, the car starts making a lot of noise. We are on a rolling highway (Route 17 NY). Family of 4 starts to debate about WTF the noise is. Maybe something came loose on the front of the the car? Climbing up the next hill...noise get really loud and then BANG! car is dead...engine seized.

Fast forward 3 months and a lot of headache...we finally get our car back mid-December 2021. The alignment is off, the tranny has a problem, and the check engine light is one. I am 200 miles from home, and NOT leaving my car there again.

Fast forward 3 more months, I have since gotten my car repaired at my local mechanic, and submitted for reimbursement of expenses (car rental, hotel stay, post-engine replacement mechanic work, etc). Hyundai called me yesterday (March 18 2022). Blah. blah. blah...can't pay for hotel...blah blah blah...we'll see about the other items....oh, "and I see that you have 2 outstanding recalls on the car, you should get it to the dealer ASAP". I explain that I had 3 recalls in 2021, so does this mean there is # 4 and #5? He confirms yes, recalls #4 (210) and #5 (966). Recall #5 sounds exactly like recall #3, no?

So now what? I have to bring the car in again, lest the engine blow up. Fine, pain in the a** but whatever.

There is no "moral of the story" here. Just giving you info to decide on how you handle things.

FYI: Engine warranty has been extended for all recall related cars.

FYI#2: all cars could have problems. Don't get me started about our 2013 Prius, when it wouldn't drive more than 10 MPH, sat at the dealer for 30 days with them clueless, 15 more days after they replaced multiple computers, and then later that year a giant recall for a computer problem that makes the Prius stop driving (yes, we were part of the few that helped them figure that one out).
 
that's about what happened to me but there wasn't any warning that I was aware of. Lost RPMs and coasted into a parking lot. 2014 Hyundai Elantra GT. Do regular oil changes and I think I've had the car about two years. Discovered the battery wasn't the right size while trying to identify what was wrong. Mechanic told us to have it towed to the dealership because it must be throwing codes telling her it's related to this bulletin. She told my wife the engine is seized up. That's probably going to cost 90% of the car's value to replace and I'm not sure what happened. There wasn't any service indicator. I didn't see anything while I was driving to warn me it was about to shut off. It's been a good little car but I think it's a $12,000k brick now. If 3/4 of its value when I bought it is needed to repair it then I'll scrap it and start over.

We did our homework before buying it and I don't remember any of this in the lemon-aide guide. We also have a 2015 Toyota Sienna and I went online and made sure there weren't any open service bulletins because I'm going to be paranoid about this stuff. It sounds like some of us were lucky and some of us weren't. Wish me luck fixing my 12k dollar brick or replacing it.
Hyundai should replace the engine for free under warranty.
 
People...I know that this is a semi-old thread, but I am posting as a warning.

We have a 2016 Sonata Hybrid. 2021 there were 3 recalls issued:
  1. 1 for an emissions sticker (the car might now pass emissions with the sticker from the factory)
  2. 1 for a new hose or a new belt (or something similar, I don't remember)
  3. 1 for possible engine failure due to the rods
Car went in to dealer June 2021. Items #1 & 2 no problem. Item #3 involved a stress test. What happens if the car passes the test: you all good, no new engine needed. Car fails? new engine needed courtesy of Hyundai. Our car passed...Yay (I'd rather have a new engine put in)

Labor day weekend...Road trip: 330 miles. Friday night 9/3 roughly 7:30pm and 200 miles into the trip (57,000 odometer miles), car starts flashing warning light: LOW WASHER FLUID. this warning continues for about 30 minutes, becoming more and more frantic (mind you, we are in the middle of no where and NOT using our washer fluid at all). Roughly 8:00pm, the car starts making a lot of noise. We are on a rolling highway (Route 17 NY). Family of 4 starts to debate about WTF the noise is. Maybe something came loose on the front of the the car? Climbing up the next hill...noise get really loud and then BANG! car is dead...engine seized.

Fast forward 3 months and a lot of headache...we finally get our car back mid-December 2021. The alignment is off, the tranny has a problem, and the check engine light is one. I am 200 miles from home, and NOT leaving my car there again.

Fast forward 3 more months, I have since gotten my car repaired at my local mechanic, and submitted for reimbursement of expenses (car rental, hotel stay, post-engine replacement mechanic work, etc). Hyundai called me yesterday (March 18 2022). Blah. blah. blah...can't pay for hotel...blah blah blah...we'll see about the other items....oh, "and I see that you have 2 outstanding recalls on the car, you should get it to the dealer ASAP". I explain that I had 3 recalls in 2021, so does this mean there is # 4 and #5? He confirms yes, recalls #4 (210) and #5 (966). Recall #5 sounds exactly like recall #3, no?

So now what? I have to bring the car in again, lest the engine blow up. Fine, pain in the a** but whatever.

There is no "moral of the story" here. Just giving you info to decide on how you handle things.

FYI: Engine warranty has been extended for all recall related cars.

FYI#2: all cars could have problems. Don't get me started about our 2013 Prius, when it wouldn't drive more than 10 MPH, sat at the dealer for 30 days with them clueless, 15 more days after they replaced multiple computers, and then later that year a giant recall for a computer problem that makes the Prius stop driving (yes, we were part of the few that helped them figure that one out).
Hyandai now has had my car for two weeks. They confirmed it's the engine issue under 966 and we won't be charged for the repairs. Beyond that I don't know much other than my odd experience when it stopped working.


Thanks for sharing your experience with was different alerts but sounds like the electronics were again aware it was the engine but not telling you it's the engine.... I used a guidebook also when looking for a used car and unfortunately this peculiar issue wasn't in it. engine recalls are not fun for anyone.
 
I had the exact same issue occur with our 2015 Hyundai Sonata Hybrid. What was the resolve for you?
We already had the engine (theta 2) replaced under the first recall and the dealer is saying that they already preformed a "bearing clearance test" and it passed. This means the engine warranty is not on them because the updated knock sensor is stating the issue is coming from the top end of the engine and not the short block side which is covered by the warranty. Doesn't make sense to me but am really caught in a hard position because I need a vehicle.
 
I brought my 2014 Hyundai Tucson in for the 966 recall on February 10th. From my understanding they updated the software to make the Knock Sensor more sensitive to engine vibration. Therefore, if there is premature wear/damage to the connecting rod bearings the knock sensor will sense the issue and warn the driver. Two days later on February 12th, I was driving and all of the sudden my check engine light was flashing and my engine shut off of and I had no control of the gas pedal. This is known as limp home mode (a mode that lets the driver get off the road safely). Brought the car to a dealership, they tried to reinstall the software, but that didn’t fix the issue. They did a bearing test, and the car passed the test. Now they think the Knock Sensor needs to be replaced. We’ll see what happens.
I had the exact same issue occur with our 2015 Hyundai Sonata Hybrid. What was the resolve for you?
We already had the engine (theta 2) replaced under the first recall and the dealer is saying that they already preformed a "bearing clearance test" and it passed. This means the engine warranty is not on them because the updated knock sensor is stating the issue is coming from the top end of the engine and not the short block side which is covered by the warranty. Doesn't make sense to me but am really caught in a hard position because I need a vehicle.
 
I brought my 2014 Hyundai Sonata Hybrid in for the 964- AUXILIARY CANISTER INSTALLION & 966- ENGINE MONITORING LOGIC Service recall campaigns on 12/08/21. Today, 12/21/21, in heavy traffic on the highway, my car engine abruptly shuts off, immediately decelerating, completely losing any ability to accerate while the engine light, parking break light come on along with an "electric motor warning - safely pull over and do not drive" message on the dashboard. All this happens while a high pitch alarm goes off. All happening simultaneously without warning on the highway with vehicles surrounding us driving 70 mph! This has never happened prior to today and should never happen. How we managed to avoid an accident or worse was a miracle. This was life threatening and should not be taken lightly!
I had the exact same issue occur with our 2015 Hyundai Sonata Hybrid. What was the resolve for you?
We already had the engine (theta 2) replaced under the first recall and the dealer is saying that they already preformed a "bearing clearance test" and it passed. This means the engine warranty is not on them because the updated knock sensor is stating the issue is coming from the top end of the engine and not the short block side which is covered by the warranty. Doesn't make sense to me but am really caught in a hard position because I need a vehicle.
 
I brought my 2014 Hyundai Tucson in for the 966 recall on February 10th. From my understanding they updated the software to make the Knock Sensor more sensitive to engine vibration. Therefore, if there is premature wear/damage to the connecting rod bearings the knock sensor will sense the issue and warn the driver. Two days later on February 12th, I was driving and all of the sudden my check engine light was flashing and my engine shut off of and I had no control of the gas pedal. This is known as limp home mode (a mode that lets the driver get off the road safely). Brought the car to a dealership, they tried to reinstall the software, but that didn’t fix the issue. They did a bearing test, and the car passed the test. Now they think the Knock Sensor needs to be replaced. We’ll see what happens.
I have had the same issues since the 966 recall for my 2015 Hyundai Tucson. After the Knock Sensor recall "enhancement" was performed, the CEL was blinking and the car went into "limp mode" and Diagnostic Tool Code P1326. Brought the car in THREE TIMES doing the same thing since the recall "enhancement"
1 - they installed a new Knock Sensor
2 - they updated software
3 - they disconnected and reconnected
Picked up the car 3rd time and now it shows issues with Fuel Pump Adapter Assembly ?????????
Was the dealer supposed to have done a Bearing Clearance Test to diagnose the Knock Sensor DTC P1326?????????
They never informed me that they were going to or did perform that test.
Can anyone tell me if they know if they were suppose to check for that? Vehicle still CEL and limp mode.
 
I have had the same issues since the 966 recall for my 2015 Hyundai Tucson. After the Knock Sensor recall "enhancement" was performed, the CEL was blinking and the car went into "limp mode" and Diagnostic Tool Code P1326. Brought the car in THREE TIMES doing the same thing since the recall "enhancement"
1 - they installed a new Knock Sensor
2 - they updated software
3 - they disconnected and reconnected
Picked up the car 3rd time and now it shows issues with Fuel Pump Adapter Assembly ?????????
Was the dealer supposed to have done a Bearing Clearance Test to diagnose the Knock Sensor DTC P1326?????????
They never informed me that they were going to or did perform that test.
Can anyone tell me if they know if they were suppose to check for that? Vehicle still CEL and limp mode.
Yes they are supposed to preform the bearing clearance test. On my car, the dealership stated that they did perform the test and it passed. Yet, the problem is still occurring. The dealer is stating that it is coming from the "top end of the engine" which I find highly unlikely because why would a knock sensor be able to identify a valve issue? I am still trying to get answers for all this. The dealer is saying that I need a new engine but on the other hand are saying its not due to the recall. I think the software update probably is identifying something else or too sensitive but getting the dealer to prove that is becoming an issue. I have a dead vehicle that cannot even be driven more then 10 miles before entering limp mode. Never had a check engine light, no misfire, or anything else. This is groundhog day with the first recalled engine. Yet, in the letter I got, it stated that I need to perform the recall to honor the engine warranty (short block).
 
Got my Hyundai Tucson back!
Just to recap, they did the bearing clearance test (which the car passed) and replaced the knock sensor, although the check engine light was still coming on because the knock sensor sensed abnormal engine vibration. They performed another bearing clearance test, and it passed that one too.
Fast forward a couple weeks.
They performed a top engine cleaning, to remove any built up carbon or other contaminants. I’ve had the car back for about a week and she’s running smooth again.
It was a lengthy (4 weeks)and relatively stressful process, but I am happy and grateful to have my vehicle back and running.
Hyundai had me pay for the knock sensor replacement, but they covered the cost of the engine cleaning. So in total I paid for a rental car, until they were able to provide me a loaner, and $500 for the knock sensor replacement.
I’ve noticed through reading this thread that some dealerships are doing things differently. According to my dealership they followed every step in the book and eventually called Hyundai corporate for follow on instructions (ie. performing the top engine cleaning).
Hoping this car lasts me another year or so, and then I’ll probably get a Toyota.
 
Got my Hyundai Tucson back!
Just to recap, they did the bearing clearance test (which the car passed) and replaced the knock sensor, although the check engine light was still coming on because the knock sensor sensed abnormal engine vibration. They performed another bearing clearance test, and it passed that one too.
Fast forward a couple weeks.
They performed a top engine cleaning, to remove any built up carbon or other contaminants. I’ve had the car back for about a week and she’s running smooth again.
It was a lengthy (4 weeks)and relatively stressful process, but I am happy and grateful to have my vehicle back and running.
Hyundai had me pay for the knock sensor replacement, but they covered the cost of the engine cleaning. So in total I paid for a rental car, until they were able to provide me a loaner, and $500 for the knock sensor replacement.
I’ve noticed through reading this thread that some dealerships are doing things differently. According to my dealership they followed every step in the book and eventually called Hyundai corporate for follow on instructions (ie. performing the top engine cleaning).
Hoping this car lasts me another year or so, and then I’ll probably get a Toyota.
I am not sure the MY of your Tucson but you should check the NHTSA website to see if your vehicle qualified for a new knock sensor during one of their (many) "product improvement campaigns." You may be entitled to a reimbursement. Also not aware of all the specifics of your car troubles but I would reach out to Hyundai Motor America and explain your situation to see if you might qualify for and apply for reimbursement under one of their recall campaigns or class action settlements. They may offer reimbursement for the rental car as well.
Good Luck !
 
Update: After I wrote the previous post I was driving home from work and the engine gave out on me…again.
Back to the dealership.
I am not sure the MY of your Tucson but you should check the NHTSA website to see if your vehicle qualified for a new knock sensor during one of their (many) "product improvement campaigns." You may be entitled to a reimbursement. Also not aware of all the specifics of your car troubles but I would reach out to Hyundai Motor America and explain your situation to see if you might qualify for and apply for reimbursement under one of their recall campaigns or class action settlements. They may offer reimbursement for the rental car as well.
Good Luck !
 
I am not sure the MY of your Tucson but you should check the NHTSA website to see if your vehicle qualified for a new knock sensor during one of their (many) "product improvement campaigns." You may be entitled to a reimbursement. Also not aware of all the specifics of your car troubles but I would reach out to Hyundai Motor America and explain your situation to see if you might qualify for and apply for reimbursement under one of their recall campaigns or class action settlements. They may offer reimbursement for the rental car as well.
Good Luck !
It's a 2014 Tucson. I'll check out the NHTSA website and I'll do some digging to see if I qualify for reimbursement.
Thanks for the tips, I really appreciate it!
 
I am not sure the MY of your Tucson but you should check the NHTSA website to see if your vehicle qualified for a new knock sensor during one of their (many) "product improvement campaigns." You may be entitled to a reimbursement. Also not aware of all the specifics of your car troubles but I would reach out to Hyundai Motor America and explain your situation to see if you might qualify for and apply for reimbursement under one of their recall campaigns or class action settlements. They may offer reimbursement for the rental car as well.
Good Luck !
I'm currently in a similiar situation, I never got the warranty letter and my engine gave out.. rod bearings.. Currently having engine replaced at another mechanic as I didn't know about this! Everyone is saying without the warranty done they won't help me, but that doesn't seem right... 2013 Hyundai Tucson.

Seems like this happens a lot
 
It's a 2014 Tucson. I'll check out the NHTSA website and I'll do some digging to see if I qualify for reimbursement.
Thanks for the tips, I really appreciate it!
I'm currently in a similiar situation, I never got the warranty letter and my engine gave out.. rod bearings.. Currently having engine replaced at another mechanic as I didn't know about this! Everyone is saying without the warranty done they won't help me, but that doesn't seem right... 2013 Hyundai Tucson 119k miles
I was driving down the road and the engine just died and made a horrible noise. Have you called Hyundai? Any tips?

Seems like this happens a lot
 
I have a 13 Tucson I received the recall letter regarding Campaign 966.
I do regular maintenance on it and take great care of the vehicle. Its at 136k miles on it. On Easter the engine gave out, i thought i had a tire going down so i coasted to the shoulder as quick as i could. No warning lights or any lights lit up.
Got out and inspected everything heard a loud knocking in the engine block and had to have it towed to the dealership. Car is currently sitting at the dealership for another 3-4 weeks before they can look at it and diagnose and submit the recall. And then who knows how much longer before i get it back. They will not help with a loaner until the car is in the shop. Such BS. Car is paid off next year too … going with a Mazda or Toyota next. Absolutely terrible service from Hyundai
 
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