2006 V6 Sonata 80K miles, after a 200 mile trip on a 90 degree day, Engine light came on and I lost alot of power, car went as high as 2000 RPM, no higher. Everything seems solid. Suspect sensor or bad converter. Not sure?
I had same problem. The accelerator pedal is a module/component with no direct linkage to the engine - it is a "drive by wire" setup - the accelerator module is probably defective and needs to be replaced. I had mine replaced under warranty and the rpoblem was solved.
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Re: Engine Light came on, Lost power
Only way to tell what is wrong is to have the computer scanned to read what code is stored in the Engine Control Module (ECM).
Any of the large parts stores, eg. Advance Auto, Autozone, Pep Boys, etc. should be able to scan it for free.
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I have a 2001 Sonata. Mine did the same thing but a little different. I bet you anything its a senser. Get it read at an autoparts store. I had two sensors go out and throw the car off whack with the "check engine" light on.
There is either a high or low circuit problem with the motor. The ecm, or called the computor, moniters the cuircuit for the motor.
The best thing to do is have the control motor checked and the ecm. One of them is bad.
The CEL means there is a Diagnostic Fault Code stored in the Engine Control Unit. There are 1000's of DTC's, so you will need to have it read by a Code Reader. Auto Parts stores like Auto Zone, Pep Boys, perhaps even Advanced Auto often will read the code for you; but by law they cannot clear the codes. Many codes do not cause drivability problems, severe ones will trigger the ECU to run in a Limp Mode, which would require repair work before any trip longer than a few miles. Hope this is helpful.
I had an issue where the ABS and ESC lights would go on and wouldn't turn off unless I restarted the car (sometimes they would light up again even if I had restarted). This was because the speed sensor was broken on my back tire. After the dealership replaced it, (under the 36,000 mile warranty) all was good and I have yet to see the lights come back on.
Issue: ABS & ESC would not turn off
Solution: Replaced broken speed sensor on tire