SYMPTOM
P0123-THROTTLE POSITION SENSOR VOLTAGE HIGH
WHEN MONITORED
With the ignition ON and battery voltage above 10.4 volts .
SET CONDITION
Throttle Position Sensor voltage at the PCM goes above 4.5 volts for 3.2 seconds .
POSSIBLE CAUSES
hope this helps, Tim 423 327 4108
A P0123 code means that the computer has detected that the TPS (throttle position sensor) is reporting too high a voltage.
Symptoms may include:
A code P0123 may mean that one or more of the following has happened:
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.
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