Readers ask: How To Reprogram Car Computer For Idle 2012 Hyundai Sonata?

How do you reset the ECU on a Hyundai Sonata?

disconnect battery, pump brake until no more lights, wait 5 min, reconnect battery, turn key to ‘ON’ (don’t start car yet) for about 1-2 min for ECU to power back up and finish resetting, key to off, start car. If car doesn’t start right away, leave key in On position and wait for another min then restart.

How can I make my car idle relearn?

To complete the idle relearn:

  1. Bring the engine to normal temperature, have the accessories off.
  2. Leave idling for 2 minutes in Park/Neutral to learn.
  3. With the vehicle securely held on the brakes or wheel chocks, change into Drive.
  4. Leave idling for 2 minutes in Drive to learn.
  5. Turn the Air-conditioning on full if fitted.

How do you reset the throttle position sensor on a Hyundai Sonata?


  1. Turn on ignition but don’t start the car. ( KOEO)
  2. Depress gas pedal to the floor for at least 5 seconds.
  3. Turn ignition off while pedal is still depressed.
  4. Release gas pedal.
  5. Wait a few minutes & restart the car. ( Not sure how long of a wait is necessary, if it all)
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How do I reset my electronic throttle control system?

Resetting your electronic throttle control manually can be a tricky job. First, make sure the accelerator pedal is fully released. Next, turn the ignition on and then turn it off and wait for ten seconds. During these ten seconds, be sure the throttle valve is moving by listening for a sound of operation.

How do I reset my car after replacing the battery?

Switch off your vehicle and unplug all fuses once it has completely warmed up, then detach the battery to cut power. All of the old data should be reset after a few minutes, so reconnect the fuses and restart your engine.

How long does it take for a car to relearn idle?

Q: How long does it take for a car to relearn idle? Anywhere from 5 to 25 minutes. It depends if we include warming up the engine during this time. Nonetheless, the car doesn’t require too much time to relearn the correct airflow intake, given that you’re doing everything correctly.

What does an idle relearn fix?

During the relearning procedure, the PCM may change the idle speed until the correct speed is achieved. If the engine threatens to stall or idles too high, stepping on the gas slightly or taking the car for a short drive will help set the PCM correctly.

How long does it take for an ECU to relearn?

When resetting the ECU it will take about 50km (31 miles) to relearn.

How do you reset the accelerator pedal position sensor?

The easiest way to reset your throttle position sensor is to unhook the negative cable from your battery for up to five minutes or to remove the fuse for your engine control module.

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How do you know if your accelerator pedal sensor is bad?

SYMPTOMS OF A FAULTY ACCELERATOR PEDAL SENSOR: SYMPTOMS Increased engine idling speed. Vehicle does not respond if the accelerator pedal is pressed. Vehicle switches to “limp-home mode” Engine warning light in the cockpit illuminates.

How much does it cost to reprogram a throttle body?

Installation prices will be low due to the easy accessibility of the throttle, so look to pay in the $50 to $75. However, some sensors and almost all of the assemblies will need to be reprogrammed, and will add anywhere from $20 to $100 to the installation bill.

What happens when the electronic throttle control goes bad?

When a TPS goes bad, then the car’s throttle body won’t function properly. It could either stay shut or it won’t close properly which is a severe issue. When the throttle gets stuck in an open position than your vehicle will receive too much air and cause it to have a high or fluctuating idle.

How do I adjust my electronic throttle body?

start the engine until it reaches the normal operating temperature. then turn the screw to adjust the idle. once you dial-in, turn-on the a/c then adjust the idle speed until the setting is correct. lastly, turn-on the headlight then adjust again until the idle speed is ok.