AutoCodes – Saturn – P0123 Saturn

P0123 Saturn Code - Throttle Position Sensor Circuit High Voltage

Quick Answer

The Throttle Position Sensor (TPS) responds to the accelerator pedal movement. 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: P0123 Saturn indicates Throttle Position Sensor Circuit High Voltage.
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 8,244

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 Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0123 Saturn 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 P0123 Saturn - Throttle Position Sensor Circuit High Voltage - AutoCodes.com — P0123 Saturn Code - Throttle Position Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0123 Saturn?

Faulty throttle position sensor
Throttle position sensor harness is open or shorted
Throttle position sensor circuit poor electrical connection

How to Fix the DTC P0123 Saturn?

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 P0123 Saturn 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 P0123 Saturn code?

Need more information on how to fix the P0123 Saturn code? Get Access to Factory Service Manuals

Need Help with the 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 P0123 Saturn Code

1. What are the common symptoms of OBDII code P0123 in a Saturn related to the throttle position sensor circuit high voltage?

The common symptoms include issues with acceleration, decreased fuel efficiency, stalling or surging while driving, and potential difficulty shifting gears.

2. What are the typical causes of the OBDII code P0123 in a Saturn indicating a high voltage in the throttle position sensor circuit?

Common causes of this code include a faulty throttle position sensor, a damaged or frayed sensor wiring harness, poor electrical connections, or a problem with the engine control module.

3. How can I diagnose the OBDII code P0123 in my Saturn related to the throttle position sensor circuit high voltage?

To diagnose this issue, you can use an OBDII scanner to retrieve the specific error code. Then, inspect the throttle position sensor and its wiring for any visible damage or corrosion. Testing the sensor's voltage output can also help pinpoint the problem.

4. What are some repair tips for fixing the OBDII code P0123 in a Saturn due to a high voltage in the throttle position sensor circuit?

Start by checking and cleaning the throttle position sensor connector and wiring. If no issues are found, consider replacing the throttle position sensor itself. Ensure all connections are secure and properly reassemble components after repair.

5. Can driving with the OBDII code P0123 in a Saturn indicating a high voltage in the throttle position sensor circuit cause further damage?

Continuing to drive with this issue can potentially lead to poor engine performance, reduced fuel efficiency, and even further damage to the throttle position sensor or other related components. It is recommended to address the problem promptly.

6. Is it possible to reset the OBDII code P0123 in a Saturn caused by a high voltage in the throttle position sensor circuit without fixing the underlying issue?

While clearing the error code may temporarily turn off the check engine light, the issue causing the code will persist and may lead to recurring problems. It is crucial to diagnose and repair the root cause of the code.

7. How can I prevent the OBDII code P0123 in my Saturn related to the throttle position sensor circuit high voltage from occurring in the future?

Regularly inspecting and maintaining the throttle position sensor and its wiring can help prevent this issue. Avoid driving aggressively or through rough terrain that could damage the sensor or its connections.

8. Are there any DIY fixes I can try at home for the OBDII code P0123 in a Saturn indicating high voltage in the throttle position sensor circuit?

While basic inspections and cleaning of connections can be done at home, replacing the throttle position sensor or addressing more complex issues may require professional assistance to ensure proper repair and reset of the error code.

9. How long does it typically take to repair the OBDII code P0123 in a Saturn caused by a high voltage in the throttle position sensor circuit?

The repair time can vary depending on the exact cause of the issue and the complexity of the repair. Simple fixes like cleaning connections may take a short time, while sensor replacement or wiring repairs could extend the repair process.

10. Can the OBDII code P0123 in a Saturn related to the throttle position sensor circuit high voltage be a recurring problem even after repair?

If the root cause of the issue is not effectively addressed during repair, the code may reappear. Proper diagnosis, thorough repair, and regular maintenance are essential to prevent the recurrence of this code.