WHAT DOES P0123 MEAN? - 2001 Dodge Dakota

try here:
P0123 Code Throttle Position Sensor Switch Circuit High Input

P0123 Code - Throttle Position Sensor/Switch A Circuit High

It means the throttle position sensor is open. ( there is no connection ) when you get a flooded engine you push the throttle all the way down and hold it until the engine starts. this is called clear flood. when you do this there is no gas going in the engine so it can clear it's self out and start. so if you have an open tps there is no gas to start the engine. note before you buy unplug and replug several times in case you just have a bad connection.

Hope this helps.

7 posts now, and most are redundant.
i answered both DTC, read the posts. and not repost it.

wrong number and double posted, read the post with P0123 you made
do not double post.
if impatient join the jeep forum...

parts store can tell you.. contact them

1) PO123 IS TPS throttle position sensor. this problem mean adjust in the voltage see the diagram use the VOM, in other model is self calibration by BCM.
2)P0504 SWITCH brake.

A P0123 code means that the computer has detected that the TPS (throttle position sensor) is reporting too high a voltage.

Symptoms may include:

• Rough idle
• High idle
• Surging
• other symptoms may also be present

A code P0123 may mean that one or more of the following has happened:

• TPS not mounted securely
• TPS circuit short to ground or another wire
• Faulty TPS
• Damaged computer (PCM)

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, carefully inspect all wiring and connectors that lead to the TPS. More than likely the problem is with the TPS wiring. Check the voltage at the TPS (refer to a service manual for your vehicle for this specific information). If the voltage spikes or is too high (over 4.65 volts with key on, engine off), then that is indicative of a problem. Carefully trace each wire from the TPS wiring harness to check for breaks, rubbing against other components, etc.

A P0123 code means that the computer has detected that the TPS (throttle position sensor) is reporting too high a voltage.

A code P0123 may mean that one or more of the following has happened:

• TPS not mounted securely
• TPS circuit short to ground or another wire
• Faulty TPS
• Damaged computer

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

http://www.2carpros.com/trouble_codes/trouble-code-P0100-P0199.htm
Here is a link where you can see what the codes mean.Hope this helps and good luck.

P0122 - Throttle Position (TP) Sensor Circuit Low Voltage
P0123 - Throttle Position (TP) Sensor Circuit High Voltage
without checking it 1st I would guess the TPS is most likely defective.
P0432 - Catalyst System Low Efficiency Bank 2, you may have to replace the Catalytic convertor, it may be worn out,
A WORD OF CAUTION: Don't use aftermarket cats, they tend to reset the same code due to compatibility issues, also replace the cat monitor sensor (looks like an O2 sensor) located just to the rear of the bank 2 cat converter.