Limp mode

Tiny
RONALD MORRISON2
  • MEMBER
  • 2012 HYUNDAI VELOSTER
  • 1.6L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 95,085 MILES
When I put it into gear and pushed the gas pedal FI reach over 1500 rpm, so it bogs down. But if I keep it under that it will go up to five miles an hour then put it in second in a go up to ten miles an hour. After that it just wants to bog down when I pushed the gas pedal. The transmission light is on.
Saturday, November 10th, 2018 AT 10:24 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,622 POSTS
Hello,

It sounds like your car is in limp mode which can be caused by a dirty throttle body causing the throttle bore and computer to lose correlation. Start by disconnecting your battery and following this guide:

https://www.2carpros.com/articles/throttle-actuator-service

We should run the codes as well.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down these guides and report back.

Cheers, Ken
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Monday, November 12th, 2018 AT 11:54 AM
Tiny
RONALD MORRISON2
  • MEMBER
  • 1 POST
I cleaned the throttle body out before I did that my check engine light was on. So I reset the codes the codes were 7e8 and 7e9 and the rear speed sensor. I cleaned the throttle body and put it back on and started it up now it is still running the same way and I also checked the coils to number four is sparking but not firing.
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Monday, November 19th, 2018 AT 11:29 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,622 POSTS
Those speed sensor codes can cause the issue. Here are the locations so you can replace them and see what happens.

Refer to DTC code "P2765, P2766" Input Shaft Speed Sensor

Check out the diagrams (below). Please let us know what you find.
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Monday, November 19th, 2018 AT 11:34 AM

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