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sprinkles08, ASE Certified Technician
Category: Hyundai
Satisfied Customers: 23103
Experience:  ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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Hyundai Santa Fe: 2007 Hyundai Santa Fe. Ran fine all day Friday.

Customer Question

2007 Hyundai Santa Fe. Ran fine all day Friday. Saturday morning, started to leave and noticed we couldn't go above 20 mph. ESC OFF light came on, check engine light came on and transmission light came on. Started it later and ran fine but now continues the same way. Any ideas?
Submitted: 2 years ago.
Category: Hyundai
Expert:  sprinkles08 replied 2 years ago.
Hello and welcome to JustAnswer!
With this combination of waring lights and symptoms I would first suspect an electronic throttle control related problem. The engine and trans lights could come on for a trans problem and if the trans was in limp in then RPM's would be very high if you tried to drive it normally, but with the ESC light coming on and it not going over 20 MPH it appears more likely to be throttle control related. The throttle body is controlled by an electric motor based on signal from the accelerator peal position sensor. If the problem is ETC related it could be the accelerator pedal position sensor, the throttle body, wiring, an intake restriction or vacuum leak.
The first step in diagnosing the problem will be to see what fault codes are setting. The warning lights have come on because the respective modules have seen an issue and set a fault code. If you don't have a code reader or scan tool of your own you can have the codes read from the engine and trans controllers for free at most big chain parts stores such as Autozone.