Codes P0087 andP0193 (Pending)?

Tiny
VELOSTERTROUBLES
  • MEMBER
  • 2016 HYUNDAI VELOSTER
  • 1.6L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
Issue: Several weeks ago, while starting my car, it kept shutting off. I was barely able to keep it running and get it home-it stalled if I ever took my foot off the gas. Once I made it home, I was able to start it one more time and since then it will not start.

Codes: P0087, P0193 (Pending)

History: Previously, in tank fuel pump died (3-4 months ago). I have replaced this fuel pump previously and I installed a new OEM one. I also replaced the fuel screen and fuel filter on the unit with OEM parts. This did not resolve the issue or change anything.

I have changed out the high-pressure fuel pump with an aftermarket one which did not change the issue. I inspected the cam follower (maybe wrong term) under the pump, and it looked good. I put 5w30 oil on it before I aligned it with the slot and pushed it back in. It can only go in one way due to being keyed and did not appear worn.

The battery is new, charged, and good. It has been tested with a battery tester and even pulled out and charged to make sure it wasn't too lot from me trying to start it a few times.

I am trying to post screenshots of a data steam that I was able to pull regarding fuel pressure.

Additional Info: If you look up "Veloster turbo P0087" you will find a variety of stories where individuals replace many different parts and have difficulty with diagnosing this issue. Several came to the conclusion that the HPFP was bad after changing several other parts-which is why it was one of the first things that I have tried with my issue.
Also, Veloster's of this age are known to have issues with fuel line problems. I cannot tell if mine is leaking or not. After trying to start it about 6 times, I do not see any spot of gas underneath it. However, the fuel line is covered so it can leak a little and be held or obscured by this cover.

Question: Where would you suggest I check next?
Sunday, November 24th, 2024 AT 2:06 PM

14 Replies

Tiny
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It keeps saying the image was added, but it isn't showing for me. I will try one more time here and upload it to imgur too.

This was captured while the car was turning over..

https://imgur.com/a/kgnYogu
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Sunday, November 24th, 2024 AT 2:09 PM
Tiny
KEN L
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So, I have seen the fuel pressure sensor on the fuel rail cause this issue. I would start by replacing the sensor and then clear the codes once the repairs have been completed.

P0087 - Fuel Rail/System Pressure Too Low

P0193 - Fuel Rail Pressure Sensor Circuit High Input

Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.
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Monday, November 25th, 2024 AT 12:37 PM
Tiny
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Hey, I really appreciate the reply. I swapped the fuel pressure sensor and cleared the codes but nothing has changed. Because of what the car is at (steep hill), I can't really get it moved or get to it safely into my garage to diagnose much more, but I suspect a fuel line.

I'm going to have it towed to the dealership in the next day or two and can update you all when I hear back.

Appreciate the advice. I fix most things myself, but it looks like this won't be one of those :/
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Thursday, January 2nd, 2025 AT 3:11 PM
Tiny
KEN L
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Okay, it can be the high pressure fuel pump causing it as well. Check out the images (below). Please let us know what happens at the repair shop.
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Friday, January 3rd, 2025 AT 11:37 AM
Tiny
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Just to clarify so far, I have replaced LPFP, HPFP (no change so reverted to original), fuel rail pressure sensor.

Car has been at dealership about 2 weeks and here's where we are at:
They believed that it was the crank position sensor since it wasn't sending a signal. Just got it today and they say that the PCM isn't sending a signal to it. They contacted Hyundai and Hyundai advises that they replace the PCM. So far waiting for a PCM to come in then should have another update mid next week.

Total cost from dealership so far is around $1800. About 600 for crank position sensor and 1200 for PCM. I'm not liking how high this cost is.

As they explained to me, the vehicle may have been trying to start and sending signals but no spark and the PCM or the crank position sensor can cause the other one to go bad. (PCM makes crank position sensor go bad, or crank position sensor makes PCM go bad.)

Does this sound reasonable to you? Would you recommend anything else?
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Friday, January 24th, 2025 AT 6:36 AM
Tiny
KEN L
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No, I don't think the crankshaft sensor can make the PCM go bad. When you had the HPFP out did you check the cam lobe that runs the pump? If this lobe wears down, it will cause this issue.
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Friday, January 24th, 2025 AT 10:35 AM
Tiny
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Hey Ken, appreciate all of your knowledge as I navigate this issue.

I pulled it and examined it. It looked okay to me, and I rubbed fresh oil on it then reinstalled it. However, I am having second thoughts. If I still had the vehicle, I would have cleaned all of the oil off to get a better look at it.
The dealership is waiting for a new PCM, and I have requested that they have a mechanic pull the HPFP and look at the cam follower to inspect it and see what they think. I'll keep you all updated on what/if they find anything.
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Thursday, January 30th, 2025 AT 1:28 PM
Tiny
KEN L
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Sounds good, thanks for getting back to me, have a nice weekend!
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Friday, January 31st, 2025 AT 10:08 AM
Tiny
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Hey Ken, greatly appreciate you sticking with me through this.
Just heard from the dealership this am. They installed PCM and now have spark but have no fuel. They are asking me if I have the original fuel pump. I explained to them that I replaced the HPFP with the original when changing it for an aftermarket made no difference and that as for the LPFP that I disassembled the unit and that I confirmed that fuel is making its way from the fuel tank to the HPFP low pressure side when I crank (Disconnected line and drained into bottle while cranking to confirm fuel delivery).

To be honest, at this point, it sounds like this dealership that my vehicle is at does not have the most knowledgeable mechanics when it comes to this issue. I just left them a message with additional details on what all I did and will update you all once I hear from them.

I'm losing faith in this dealership though. Ken, you don't by chance work in the Midwest do you? Or would you recommend anyone in the St. Louis area?
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Monday, February 10th, 2025 AT 9:32 AM
Tiny
KEN L
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Yep, dealerships can be iffy sometimes, I am sorry I don't know anyone you can take it too, I would look at Yelp and Google reviews before choosing. I wonder what codes it has now?
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Monday, February 10th, 2025 AT 10:36 AM
Tiny
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Thanks Ken. This is a well-reviewed place and insanely popular due to their reputation. Maybe it's a fluke or maybe the reviews aren't so accurate (4.5 avg stars over about 5,000 google reviews). So far, my impression of their way of fixing things is pretty foreign to me. They plug in scan tool, contact Hyundai, do what Hyundai recommends, then if it doesn't work, they ask Hyundai what they should do next. I'm not trying to flame them, but when I take my vehicle to a mechanic, it's specifically for the mechanic having experience and expertise, not for them to be a middleman who can't diagnose a problem themselves.
That said, I never took my vehicles to dealerships and always fixed my own vehicles for the last 20 years so maybe I am out of touch with the way you have to do things now.

So far, the cost is $2,000 for a car that still will not start and run. Now they just got back to me and said that the flow of fuel is low and that likely the fuel pump that I installed is not delivering enough fuel for the vehicle to start. Bad parts happen, but how did this supposedly kill a PCM?

Now they want another $985 to install a fuel pump assembly. Since they said the fuel lines are good and they are fairly certain that it's the low pressure fuel pump, I'll just tow the vehicle home and do it myself, or even in the parking lot. I can swap the assembly in an hour or less and I'm a nobody. Do you need to reprogram anything on these vehicles if you change a low pressure fuel pump?

I don't think that's the case and feel like I am paying for someone's mistake. The hours worked, I do not dispute, but I disagree with paying for a PCM because I don't see how a bad low pressure fuel pump could in any way kill a PCM. And I see it as highly unlikely for two parts to fail that can both independently cause the same no start situation. Does this seem reasonable?
I'm not usually one to complain but I think I will see if I can get a discount or something because this seems unreasonable. Do you have a good way that I could word it to them when I pick up the vehicle?
I'm not great with people, hard time expressing myself accurately. If I can manage to get a discount or something, I'll gladly toss your website some of the money I save.

Hope all of this makes sense and sorry for the book, a little upset over all of this.
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Monday, February 10th, 2025 AT 1:39 PM
Tiny
KEN L
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That is reasonable, it sounds like they missed the problem, and it was a defective LPFP. This pump does not need programming so you can do the job yourself if needed. You worded it perfectly, tell them what you told me, and they should work with you about the price.
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Tuesday, February 11th, 2025 AT 9:51 AM
Tiny
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Thanks again Ken. I ended up letting the dealership do the fuel pump since I had an unexpected family emergency come up. Here are the pictures of the final bill. I haven't picked up the vehicle yet. I do want to clarify one thing, I thought that they told me the PCM over the phone, but it was the ECU. So, when I said "PCM" previously, that should have said ECU.

Please see the attached pictures for the details that they typed in.

I'll see what I can do about the price and speak with them.

Question: Do you think I may have ruined the ECU myself?
I'm trying to reconcile the ECU stop working since it sounds like the issue changed when they replaced it. I do not recall if I disconnected the battery or not every single time I tried working on the vehicle (I usually do, especially around fuel) but if I caused a connector to short, could that ruin an ECU and maybe crank sensor?
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Friday, February 21st, 2025 AT 11:05 AM
Tiny
KEN L
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It is hard to say if you damaged the ECU, it looks like they are throwing parts at it, how can the ECU, crankshaft sensor, and the low-pressure fuel pump be bad at the same time? I guess it's possible. I would bring that up to them to help work on the price.
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Saturday, February 22nd, 2025 AT 11:26 AM

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