AutoCodes – Chevrolet – P0123 Chevrolet

P0123 Chevrolet Code - Throttle Position Sensor Circuit High Voltage

Quick Answer

The Throttle Body Assembly contains a contact-less inductive throttle position sensing element that is managed by a customized integrated circuit. Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly 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 Chevrolet indicates Throttle Position Sensor Circuit High Voltage.
Common causes: Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly 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 26,559

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 May 20, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0123 Chevrolet Description

The Throttle Body Assembly contains a contact-less inductive throttle position sensing element that is managed by a customized integrated circuit. The throttle position sensor is mounted within the throttle body assembly and is not serviceable. The Engine Control Module (ECM) supplies the throttle body with a 5 V reference circuit, a low reference circuit. The asynchronous signal means communication is only going from the throttle body to the ECM. The throttle body cannot receive data from the ECM over the signal/serial data circuit. The throttle position sensor provides a signal voltage that changes relative to throttle blade angle. The throttle position sensor information is transmitted between the throttle body and the ECM on the signal/serial data circuit. The ECM decodes the serial data signal and is used as voltages for throttle position sensor 1 and 2. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the throttle position sensor 1 signal voltage is greater than 4.7 V for greater than 1 s.

OBDII Code P0123 Chevrolet - Throttle Position Sensor Circuit High Voltage - AutoCodes.com — P0123 Chevrolet Code - Throttle Position Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0123 Chevrolet?

Faulty Throttle Body Assembly
Throttle Body Assembly harness is open or shorted
Throttle Body Assembly circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0123 Chevrolet?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0123 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the P0123 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P0123 2014 Chevrolet Silverado — Throttle Position Sensor Circuit High Voltage
P0123 2015 Chevrolet Silverado — Throttle Position Sensor Circuit High Voltage
P0123 2016 Chevrolet Silverado — Throttle Position Sensor Circuit High Voltage
P0123 2017 Chevrolet Silverado — Throttle Position Sensor Circuit High Voltage
P0123 2018 Chevrolet Silverado — Throttle Position Sensor Circuit High Voltage

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 Chevrolet Code

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

- Common symptoms include poor acceleration, reduced fuel efficiency, stalling or surging of the engine, and the vehicle going into limp mode.

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

- The main causes are a faulty throttle position sensor, a short or open circuit in the sensor's wiring, or a problem with the vehicle's ECM (engine control module).

3. How can I diagnose the P0123 code on my Chevrolet related to the throttle position sensor circuit high voltage?

- You can use a scan tool to read the trouble code and check the throttle position sensor's voltage output. Inspect the sensor's wiring for any damage or loose connections.

4. Can I still drive my Chevrolet with the P0123 code indicating high voltage in the throttle position sensor circuit?

- It's not recommended to drive the vehicle with this issue as it can lead to poor performance and potential safety hazards. It's best to address the problem promptly.

5. Are there any simple repair tips for fixing the P0123 code on a Chevrolet due to high voltage in the throttle position sensor circuit?

- Check the sensor's connector for corrosion, clean it if necessary, and ensure a secure connection. If the issue persists, consider replacing the throttle position sensor.

6. How much does it typically cost to repair the P0123 code on a Chevrolet caused by high voltage in the throttle position sensor circuit?

- The cost can vary depending on the specific model and labor rates, but replacing the throttle position sensor or repairing the wiring may range from $100 to $300.

7. Will resetting the trouble codes clear the P0123 code related to high voltage in the throttle position sensor circuit on my Chevrolet?

- Resetting the codes may temporarily clear the warning light, but if the underlying issue is not fixed, the code is likely to reappear after driving the vehicle.

8. Can a DIY enthusiast with basic automotive knowledge fix the P0123 code on a Chevrolet themselves?

- Yes, replacing the throttle position sensor or checking and repairing the wiring can be done by someone with basic automotive skills and the right tools.

9. What are the long-term effects of ignoring the P0123 code indicating high voltage in the throttle position sensor circuit of a Chevrolet?

- Ignoring the issue can lead to further damage to the engine, reduced fuel efficiency, and potentially unsafe driving conditions due to erratic throttle response.

10. Is it recommended to seek professional help to diagnose and repair the P0123 code on a Chevrolet related to high voltage in the throttle position sensor circuit?

- If you are unsure about diagnosing or fixing the issue yourself, it's best to consult a professional mechanic who can accurately diagnose the problem and perform the necessary repairs.