Where is the speed sensor located? and how do i know if thats wat the problem is?

Hello Kamran, Your vehicle output speed sensor is located on the transmission tail housing. You can find some images by searching "Google" - 2011 Chevy Cruze Output speed sensor location.

Lorraine, speed sensors are not located on engines. there are transmission speed sensors and wheel speed sensors.
Check the attached links,instruction and guides, Good luck
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Speed sensors locations Google Search

Vehicle Speed Sensor Location

vehicle speed sensor VSS

wheel speed sensors Google Search

If you are referring to the Vehicle Speed Sensor (VSS), they (there are two) are located at the rear of the Transfer Case (item 21 in the attached figure)

Hi there:
DTC P0500 - Vehicle Speed Sensor Malfunction
Basically this means that the vehicle's speed as read by the Vehicle Speed Sensor (VSS) is not working properly.

Symptoms of a P0500 DTC may include:
loss of anti-lock brakes
the "anti-lock" or "brake" warning lamps on the dash may be lit
the speedometer or odometer may not work properly (or at all)
your vehicle's RPM limiter may be decreased
the shifting of an automatic transmission may become erratic
other symptoms may also be present

A code P0500 may mean that one or more of the following has happened:
The Vehicle Speed Sensor (VSS) is not reading (functioning) properly
There is a broken/frayed wire leading to the vehicle speed sensor
The vehicle's PCM is not correctly configured for the actual tire size on the vehicle

Possible Solutions:
The simplest thing to do is to reset the code and see if it comes back.
Next, check all wiring and connectors that lead to the speed sensor. The location of the sensor depends on your vehicle. The sensor could be on the rear axle, transmission, or perhaps the wheel hub (brake) assembly.
If the wiring and connectors are OK, then check the voltage at the speed sensor. Again, the exact procedure wil depend on your make and model of vehicle.
If everything looks OK, replace the sensor.

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I assume you know the location of the sensor if not, it is located on top of the transmission unit. Disconnect the wire connector, unscrew 2 screws holding the speed sensor the you are done.

There is an input and output on the transmission,The output is also the vehicle speed sensor.

as far as i know there is only one speed sensor and it is located on top of the rear differential should have one bolt holding it in. i believe that code says the speed sensor has a low output.

engine light keeps comeing on n sometimes the battery light comes on my 94 lexus es 300 wat does tat me

Boritz2: there are several speed sensors on this vehicle, so I will give you the locations of all of them due to the fact that I don't know which one you are seeking.
There are speed sensors located at each wheel to work with the ABS unit.
On the trans-axle, on the driver's side near the top of the transmission.
I hope this has been helpful to you.
Is there a reason you are looking for the speed sensor?