AutoCodes – KIA – P1121 KIA

P1121 KIA Code - Throttle Position Sensor Signal Invalid

Quick Answer

Throttle Position (TP) Sensor measures the opening angle of throttle valve and mounts on the side of the throttle body and is connected to the throttle blade shaft. 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: P1121 KIA indicates Throttle Position Sensor Signal Invalid.
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 30,326

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
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1121 KIA Description

Throttle Position (TP) Sensor measures the opening angle of throttle valve and mounts on the side of the throttle body and is connected to the throttle blade shaft. The TP sensor’s resistance changes according to the throttle blade shaft position. TP Sensor has a potentiometer whose resistance changes along with the Throttle valve position. The Engine Control Module (ECM) provides a 5volt reference voltage to the TP Sensor. The ECM reads the voltage across the TP Sensor and converts it into throttle position. During acceleration, the TP Sensor resistance decreases. During deceleration, the TP Sensor resistance increases. The ECM uses the TP Sensor signal to adjust timing and injector pulse width. The TP Sensor signal along with the MAF sensor signal is used by the ECM to calculate engine load. Throttle angle information to the ECM to be used for the detection of engine status such as idle, part load, full throttle condition and anti-jerk condition and acceleration fuel enrichment correction.

OBDII Code P1121 KIA - Throttle Position Sensor Signal Invalid - AutoCodes.com — P1121 KIA Code - Throttle Position Sensor Signal Invalid

What does this mean?

What are the Possible Causes of the DTC P1121 KIA?

Faulty Throttle Position Sensor
Throttle Position Sensor harness is open or shorted
Throttle Position Sensor circuit poor electrical connection

How to Fix the DTC P1121 KIA?

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 P1121 KIA 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.

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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 P1121 KIA Code

What does OBDII code P1121 on a Kia mean?

P1121 indicates that the throttle position sensor (TPS) is sending an invalid or inconsistent signal to the engine control module (ECM).

What are the common symptoms of code P1121 in a Kia?

Symptoms may include poor acceleration, engine hesitation, high or low idle, stalling, or the check engine light being illuminated.

What causes the P1121 code in a Kia?

The code can be caused by a faulty throttle position sensor, damaged wiring or connectors, or issues with the ECM.

Can a dirty throttle body cause the P1121 code on a Kia?

Yes, a dirty or sticking throttle body can affect the TPS signal and lead to the P1121 code.

How can I diagnose the P1121 code on a Kia?

You can use an OBDII scanner to confirm the code, inspect the throttle position sensor and wiring, and check the throttle body for dirt or debris.

Can I drive my Kia with the P1121 code?

Driving with this code is not recommended, as it can lead to reduced performance, stalling, and potential safety hazards.

How do I fix the P1121 code on a Kia?

Repairs may include cleaning the throttle body, replacing the throttle position sensor, or repairing damaged wiring.

How much does it cost to fix code P1121 on a Kia?

Repair costs vary but typically range from $100 to $300, depending on whether the TPS needs replacement or wiring repairs are required.

Will clearing the code P1121 solve the issue on a Kia?

Clearing the code may temporarily remove the check engine light but won't fix the underlying problem causing the invalid TPS signal.

Can a failing ECM cause the P1121 code in a Kia?

While rare, a malfunctioning ECM can potentially cause the P1121 code if it incorrectly interprets the TPS signal.

Discuss the causes and fixes for P1121 KIA OBDII Code

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Greg Guttridge
Date: June 19, 2023 at 4:47 am

After market part working fine but cannot clear the code, differences between the signal is the cause. OEM or code u pick.

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