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My 2009 sonata loses power and i get a ESC code and check engine light comes on what does this mean and when i turn off the car then back on its ok but check engine light is still on for awhile ,why does the car loose power when this light (esc) comes on .?
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The ESC Off light comes on and pushing the ON/OFF switch does not put it out. If I shut the car off and re start, the dash light goes out sometimes; May return the next time I start the car..I've heard that the problem has something to do with the brake sensors. People usually notice that the brake lights go crazy as well.My 2009 is in the shop right now for my check engine light. My ESC light is also coming on as well. They ran the diagnostic and the only code that showed up was a faulty crankshaft sensor. I'm wondering if that is affecting the ESC. I know when the ESC comes on I get hesitation before it. That might be the crankshaft sensors doing. They said no other codes came up.This problem was recalled back in 2007-2008 and is presently being recalled on some vehicles. This appears to be a common problem with Hyundais who refuse to address the problem unless the cars are recalled. Please write the National Car Safety so that they can request a recall. Without these complaints, the recall will not occur and everyone will be paying out of pocket for a manufacturing defect.
This may not be your problem but it does bring the vehicle in fail safe you may have a warranty
Group TRANSAXLE
Number 09-AT-016
Date AUGUST, 2009
Model 1999-SONATA 2001-ELANTRA, SANTA FE & XG 2003-TIBURON 2005-TUCSON 2006-AZERA 2007-ENTOURAGE
An improperly functioning input speed sensor or output speed sensor may result in the following conditions:
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"Check Engine" light on
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Harsh P-R or P-D engagement shock
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Transaxle in 3rd gear fail-safe
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Diagnostic trouble codes
1. Using a GDS, check for DTCs in both the "Engine" and "Automatic Transaxle" menus. Record the DTC and description.
2. From the GDS, select:
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Vehicle
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"Auto Transaxle" menu
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"Current Data"
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"Input speed sensor" and "output speed sensor". Drive the vehicle and monitor the input and output speed sensors. If the sensors show:
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Continuous output, the wiring currently has no open/shorts. Go to Step 6.
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No output, go to Step 3
3. Check the wiring harness visually for an open circuit or short circuit to ground. Check for a pinched harness at the PCM/TCM attachment bolts.
4. Disconnect the connectors at the input and output speed sensor and PCM/TCM. Check for bent pins or pins not fully inserted into the connector.
5. If a harness open/short is found, repair or replace the ECM control harness between the PCM/TCM and transaxle and go to Step 8. If not, go to Step 6.
These codes indicate your accelerator position sensor has malfunctioned. The computer has gone into limp mode, which allows you to drive to safety without damaging the engine. The computer is unable to determine how far you are depressing the accelerator and doesn't want to over-rev the engine. You need a new sensor.
Replace the brake/stop lamp switch at the brake pedal, also check for trouble codes. Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on. You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any codes which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE and perhaps eventually fix the problem.
For some reason, the ESC system "thinks" the drive wheels are slipping and it is trying to prevent the tires from spinning.
Take the car to your local Auto Zone and ask them to scan the car for trouble codes, they will do the scan for free. Write the codes down and respond back to this post and we can start to diagnose the problem.
Good luck and let me know.
Regards,
OK!... I assume you mean the ESC light... right? Based on my experience, what you have is a malfunctioning BRAKE LAMP SWITCH... replace it and see if that fixes your problem. Hope this is helpful (since you didn't scan the 'CHECK ENGINE' light issue).Whenever the 'CHECK ENGINE' (Service Engine Soon) light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on.
You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. If, IN FACT, you have a 'BRAKE LAMP SWITCH' code, then you've found the problem and the solution.
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.
Summary:
Issue: ABS & ESC would not turn off
Solution: Replaced broken speed sensor on tire
I had the problem with the engine light and the ESC light on. At the same time the car would not accelerate. I disconnected and reconnected the battery and works fine now.
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