P0123 – replaced TPS but still dies while driving

Do you have to reset computer after replacing throttle position sensor?

After replacing the throttle body to your engine, if the engine light was on and has a pending code, the code will go away. If the code was a hard permanent code, then the ECM (computer) would need a hard reset.

How do I fix error P0123?

What repairs can fix the P0123 code?

  1. Repairing or replacing the TPS connector for shorting.
  2. Repairing the wiring short as necessary.
  3. Replacing the TPS with a new sensor.

What happens if you unplug the TPS sensor?

Can I Bypass My Throttle Position Sensor? When you disconnect the throttle position sensor, take 30 seconds to turn on your ignition and wait for the engine to start, your vehicle should start properly. TPSes can only work if the ECU realizes they’re not working and adjusts the engine’s functioning accordingly.

What conditions set the DTC P0123?

Vehicles with electronic throttle control (ETC) use two throttle position sensors as a fail-safe measure. If the engine computer receives a signal from the TP sensor that exceeds the maximum limit for a set period, a P0123 code may get registered by on-board diagnostics.

How do you reset the throttle position sensor on a Honda?

The procedure for resetting the throttle body on a Honda is straightforward. To begin, insert your key into the ignition and turn it to the RUN position for three seconds. Afterwards, start the car and try to crank it up to around 3,000 RPM or higher. The radiator fans should be forced to turn on as a result of this.

What does diagnostic code P0123 mean?

Throttle/Pedal Position Sensor/Switch

OBD-II Code P0123 is defined as a Throttle/Pedal Position Sensor/Switch “A” Circuit High Input. Driving with this trouble code is not recommended. A vehicle with this code should be taken in to a repair shop for diagnosis.

Why does the throttle position sensor Get Low voltage?

The voltage of the throttle position sensor can drop below the expected range for several reasons, including the following: A loosely-mounted throttle position sensor. Electrical short on the sensor circuit, either to the ground or to another wire. Faulty sensor.

How do you fix a throttle position sensor?

And get the connector and plug it back in till it snaps then cross your fingers and start up. And voila no more shaking. And no more check engine light coming.

How do you reset the throttle position sensor on a Mercedes?

Key in the ignition. Turn it to the point where all the lights come on but don't start your car. Leave it that way. You know coming here we're gonna listen for the throttle body to move.

Does a throttle position sensor need to be programmed?

Code errors can cause your throttle position sensor to work erratically or incorrectly. Otherwise, you’ll need professional software to reprogram your sensor. This job is best done by a professional mechanic.

How do I reset my Mercedes accelerator?


  1. Turn the ignition key to the on (not start) position.
  2. Press the gas pedal to the floor and hold for five seconds.
  3. Turn the key to the “off” position (don’t remove the key), then release the gas pedal.
  4. Wait at least two minutes for ECU to reset.

Can throttle position sensor affect transmission shifting?

The Throttle Position sensor measures the throttle position, which is controlled by the gas pedal. It is used to determine engine load and if it fails it can cause automatic transmission shifting problems.

Which speed sensor controls the transmission?

Typically, two sensors communicate the transmission data to the vehicle’s powertrain control module. The first sensor, referred to as the input sensor, monitors the speed of the transmission’s input shaft. The second sensor is the output sensor, which monitors the output shaft speed.

What sensor can cause a transmission to slip?

The Turbine Shaft Sensor measures input shaft speed. The PCM uses the information provided by the TSS to determine whether or not the transmission is slipping. When it fails it usually results in shift timing problems. Depending on the manufacturer, it can cause multiple shift-timing and shift-feel problems.