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2014 Veloster Turbo
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Discussion Starter #1 (Edited)
Hey guys!

I'm a new 2014 Veloster turbo owner. I bought the car secondhand. I've noticed that during hard acceleration my turbo will give out, and I get a check engine light. I notice it most often while accelerating hard uphill, for instance on an on-ramp. The issue resolves itself once the car is turned off and then back on again. I'm able to reproduce the issue pretty consistently: From stop, shift into first, accelerate to 4k RPM. Shift into second, accelerate to 5k RPM. In third gear, the cars' power will bleed off, then the boost drops entirely and CEL comes on with p0299 code. It doesn't seem to be due to a mechanical failure, the turbo noise sounds normal even with no boost hitting the engine. There's no odd vibrations, and as I've said it resolves itself once the car is turned off and on again. Softer acceleration usually doesn't cause it to happen, but I've had it occur infrequently while around 2-3k RPM in 4th gear during normal driving.

My question is: What would cause this? Could this be caused by a bad turbo? I'm still getting used to the car, so I'm not sure if there's any other symptoms I should be looking for.

Car info:

2014 Veloster Turbo, AT
114k Miles
turbo replaced previously with good used turbo w/ 50k miles by previous owner
no history of accidents
no previous tune or track time per previous owner
oil and air filter recently changed, coolant is a nice green color
Air intake has been replaced by K&N short ram
Previously driven in state with salted roads, some surface level corrosion on steel and aluminum parts.


EDIT WITH SOLUTION

Replacing the Wastegate solenoid resoled this problem, thanks RPW00Mirage!
 

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You write:
In third gear, the cars' power will bleed off, then the boost drops entirely and CEL comes on with p0299 code.
So, are you witnessing this with a Torque App or something similar?
Then:
it resolves itself once the car is turned off and on again.
You are only referring to the trouble code, are you not?

Have you considered the blow-off valve is the problem?
 

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2014 Veloster Turbo
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Discussion Starter #3
So, are you witnessing this with a Torque App or something similar?
Yes, I'm using the torque app. I've also taken it to autozone to get the code read, just ince case mine was wrong

You are only referring to the trouble code, are you not?
No, the check engine light remains on after restarting it. The boost pressure comes back once the car is restarted.

I have considered it being the blow off valve, but I'm not sure. I plan on replacing that and the boost control solenoid if I can't find the cause for sure, since it seems to be the cheapest part to replace.

Thanks for the reply!
 

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weekend racer
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When I had this problem I used this part to fix it.

394102b100

Wastrgate solenoid valve.
 

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Ok, since you answered in the affirmative, my feeling is that it is the blow-off valve/solenoid assembly that is causing the problem.
I know that if a turbo goes bad, it stays bad, that is, a turbo will not go in and out. It is spun up by the exhaust and as long as the exhaust is present the turbo will spin.
Now I must say this however.
I am sure there is a sensor in the intake that send a signal to the ECU, since that is how the pressure reading is derived.
The ECU also controls the blow-off valve.
So, there is that possibility that the ECU is seeing a bogus sensor reading and opening the blow-off valve causing the problem.
I really don't think that's the problem however because there have been quite a few reports on the forum about faulty blow-off valves (torn diaphragms) and other ailments about the same pressure relief system.
 

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Discussion Starter #6 (Edited)
That might actually be the case! I found this other thread from 2015 while looking through posts with a similar issue:


At the end of this thread, even after replacing turbos, solenoids and the works, it still wasn't resolved. The ECU may be at fault. I have noticed that there seem to be some weird electrical happenings with the car, but I just wrote it off since it wasn't affecting drivability.

Let me take it for a test drive today and I'll come back with an update.

EDIT: Read a bit further, guy said replacing the entire intercooler assembly fixed it. That's a bit pricey, but good to keep in mind if nothing else works. Thanks for the replies everyone
 

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weekend racer
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i did the BOV and bov solenoid up front first, but the wastegate solenoid was what ultimately fixed my problem.
 
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weekend racer
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it is easy! i got it from underneath. you should get new silicon hoses as well. i did that at at time.
 
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2014 Veloster Turbo
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Discussion Starter #10
Welp. I'm pretty sure it's ECM related now.

132610


Can you spot the issue(s)?

This happened on the highway doing about 60mph. I noticed while passing someone that the TC light came on. After that, tire pressure light came on. I thought I got a flat, so I started to pull over when the RPM needle dropped to 0, the temp went away, the clock reset to noon, my music stopped, and the EPS and CEL light came on. As I came to a stop by the side of the road the engine shuddered and stalled out. After starting the car again, all lights went away and the car sounded happy as a clam.
 

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weekend racer
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do you have anything plugged into the obd2 port?

also we have the same-ish mileage. i have 112k lol
 

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weekend racer
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That has been known to cause some **** with the cluster and radio shutting down.

restarting the car fixes it.
 

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weekend racer
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It’s not detrimental. Sometimes my ultragauge does it. I don’t ever unplug it.
 

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Discussion Starter #17
New solenoid installed. Hoses were basically welded onto the old one. Now getting 200+hp at the crank and 16.7 psi of boost. Low boost pressure has completely gone away, only to be replaced by loud squeaking sound coming from the front left at full boost. I'm assuming the intercooler hoses have a small pinhole leak that's making the sound. I can replace those hoses soon, but you guys were right; the solenoid was broken. The solenoid was visibly cracked and was likely leaking air pressure, causing the problem. I'm assuming this happened when the turbo was replaced.

Again, I wouldn't have thought to change the solenoid without your help. Much thanks for pointing me to a $45 part that got me 45+ horsepower!
 

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I was having a similar issue i replaced the turbo with a new one and car runs like a champ feels like a Subaru
 
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