Idle position of the throttle valve is determined by the ECM 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." property="og:description">
For Shop Owners

P0121 CADILLAC - Throttle Position Sensor 1 Performance

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3 What does this mean?

Possible causes

  • Faulty throttle position sensor
  • Throttle position sensor harness is open or shorted
  • Throttle position sensor circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
What does this mean?

Tech notes

On some models, the Throttle Position Sensor (TPS) is part of the throttle body assembly.

User Submitted Video

What does this mean?

When is the code detected?

Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM.

Possible symptoms

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

P0121 CADILLAC Description

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 Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM.

Idle position of the throttle valve is determined by the ECM 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.

OBDII Code P0121 Cadillac - Throttle Position Sensor 1 Performance -

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P0121 CADILLAC Comments

Help us improve Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P0121 Cadillac code? Have you replaced any parts?
Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 2
1=Easy 2=Moderate 3=Hard

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