AutoCodes – Cadillac – P1120 Cadillac

P1120 Cadillac Code - Throttle Position Sensor 1 Circuit

Quick Answer

The Throttle Position (TP) sensor is a potentiometer. Common causes include Faulty Throttle Position Sensor, Throttle Position Sensor harness is open or shorted, Throttle Position Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1120 Cadillac indicates Throttle Position Sensor 1 Circuit.
Common causes: Common causes include Faulty Throttle Position Sensor, Throttle Position Sensor harness is open or shorted, Throttle Position Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 7,166

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 25, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1120 Cadillac Description

The Throttle Position (TP) sensor is a potentiometer. The TP sensor provides a voltage signal that changes relative to throttle blade angle. This signal voltage is one of the most important inputs used by the Powertrain Control Module (PCM). The TP sensor has a 5.0 volt reference, a ground and a signal circuit.
TP sensor Signal voltage should be about 0.6 volt at idle. The TP sensor voltage should increase to above 4.0 volts at wide open throttle (WOT).

OBDII Code P1120 Cadillac - Throttle Position Sensor 1 Circuit - AutoCodes.com — P1120 Cadillac Code - Throttle Position Sensor 1 Circuit

What does this mean?

What are the Possible Causes of the DTC P1120 Cadillac?

Faulty Throttle Position Sensor
Throttle Position Sensor harness is open or shorted
Throttle Position Sensor circuit poor electrical connection
Throttle Position Sensor not properly adjusted

How to Fix the DTC P1120 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1120 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1120 Cadillac code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1120 Cadillac Code

1. What are the common symptoms of OBDII code P1120 in a Cadillac related to the Throttle Position Sensor 1 Circuit?

- Common symptoms may include poor engine performance, rough idling, stalling, and issues with acceleration.

2. What are the possible causes of OBDII code P1120 in a Cadillac?

- The code P1120 may be triggered by a faulty throttle position sensor, wiring issues, or problems with the throttle body itself.

3. How does a faulty throttle position sensor contribute to the occurrence of code P1120 in a Cadillac?

- A faulty throttle position sensor can send incorrect data to the engine control module, leading to improper fuel delivery and affecting overall engine performance.

4. Can a dirty throttle body cause OBDII code P1120 in a Cadillac?

- Yes, a dirty or clogged throttle body can disrupt the throttle position sensor's readings, potentially triggering code P1120.

5. What steps can be taken to diagnose the root cause of OBDII code P1120 in a Cadillac?

- Diagnostic steps may include checking the throttle position sensor's wiring, inspecting the throttle body for cleanliness, and testing the sensor's voltage output.

6. How can the throttle position sensor in a Cadillac be tested for functionality?

- The throttle position sensor can be tested using a multimeter to measure voltage output as the throttle is opened and closed.

7. Is it possible to repair OBDII code P1120 in a Cadillac without professional help?

- Some DIY enthusiasts may be able to address code P1120 by cleaning the throttle body, checking the sensor's wiring, or replacing the throttle position sensor themselves.

8. What are the risks of ignoring OBDII code P1120 in a Cadillac?

- Ignoring code P1120 can lead to poor engine performance, reduced fuel efficiency, and potential safety hazards while driving.

9. Can resetting the OBDII system clear code P1120 in a Cadillac?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.

10. How can a Cadillac owner prevent OBDII code P1120 related to the throttle position sensor?

- Regular maintenance, including cleaning the throttle body, inspecting sensor wiring, and addressing any issues promptly, can help prevent the occurrence of code P1120.