Engine-Codes - Jeep - P0121 2004 JEEP LIBERTY

P0121 2004 JEEP LIBERTY - Throttle Position Sensor 1 Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P0121 2004 JEEP LIBERTY Possible Causes

  • Faulty throttle position sensor
  • Throttle position sensor harness is open or shorted
  • Throttle position sensor circuit poor electrical connection
  • Faulty Powertrain Control Module (PCM)

How is the P0121 2004 JEEP LIBERTY code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P0121 2004 JEEP LIBERTY code

Labor: 1.0

The cost to diagnose the P0121 2004 JEEP LIBERTY code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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When is the code detected?

Sensor input voltage does not fall within a valid range based on engine speed and load

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0121 2004 JEEP LIBERTY Meaning

The Throttle Position Sensor (TPS) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Powertrain Control Module (PCM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the PCM.
Idle position of the throttle valve is determined by the PCM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

More Information

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