P0501 error code

Hi, Today I noticed that my ABS and ESC lights are on and the cruise is not working and the check engine light is on with DSC code P0501. I understand this has to do with either the brake pedal switch problem or with the Speed sensor output from the transmission to the ECM.

I have an 2007 Hyundai Santa fe GLS 2.7L

any ideas?

thanks
max

 

The vehicle actually has two speed sensors
One is in the transmission
The other is usually the right front abs/tone-ring sensor
The ECU gets inputs from both sensors and compares them
If the readings are way out of known good values then the ECU will put the engine in limp mode
If the wheel/abs sensor is reading out of range then ABS and ESC lights will go on
Would check .. visual inspection .. of wiring
If nothing found then must use a higher level scanner (not a code reader) to diagnose issue.

Good luck

 

is it possible that the issue is with the input speed sensor that located right under the acceleration cable(which is below the thermostat housing) , the reason I say that is when I remove the electrical plug connected to this input sensor I don't see a any difference. meaning if it was not this sensor removing the cable will generate a different error code and it didn't. what do you think?

 

Did you drive the vehicle with the connector off? Don't.
If you have a multi-meter then back probe to see if it is getting power and ground
Then go on internet to check for prices

Don't like to just replace parts without being sure the part is faulty
However, sometimes if the part is cheap enough then replace it

Good luck

 

what will happen if I drive it with the sensor not connected?
also the power to the VSS is correct I get 12V(pin1) and GND(pin2) and (pin3)7V to signal wire when the car key is on position
and with or without the cable connected to the sensor I get the same symptoms so I think its the sensor by the problem replacing the sensor didn't help.

 

Sometimes you need to clear a code to see if it will come back?

Seems the sensor has the power and ground it needs
And there is a signal. But, can not tell how the signal is without an oscilloscope.
If you already tried to replace it without any luck then would probably check the wiring from sensor to ECU

 

how do I know I'm in limp mode, the car drive fine. the speedometer show to the correct speed the RPM show the correct RPM, it is just that the two light ABS /ESCoff are ON and check eng, is ON.
it can be wheel/abs sensor still , right?
can I drive the car like this until I take to my mechanic?

 

If you have got no problem driving (no limp mode) then get it to a mechanic
Please update to let us know what happens. Thanks.