AutoCodes – Chevrolet – P0123 2015 Chevrolet Silverado

P0123 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado 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 544

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 2015 Chevrolet Silverado 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 2015 Chevrolet Silverado - Throttle Position Sensor Circuit High Voltage - AutoCodes.com — P0123 2015 Chevrolet Silverado Code - Throttle Position Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0123 2015 Chevrolet Silverado?

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 2015 Chevrolet Silverado?

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 2015 Chevrolet Silverado 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 P0123 2015 Chevrolet Silverado Code

1. What does the OBDII code P0123 mean on a 2015 Chevrolet Silverado?

P0123 indicates a "Throttle Position Sensor (TPS) Circuit High Voltage," meaning the engine control module (ECM) is detecting a voltage signal from the TPS that is higher than expected.

2. What are the common symptoms of code P0123 on a 2015 Chevrolet Silverado?

Symptoms may include poor acceleration, rough idling, engine hesitation, sudden surging, reduced power mode (limp mode), or an illuminated check engine light.

3. What causes the P0123 code in a 2015 Chevrolet Silverado?

Common causes include a faulty throttle position sensor, damaged wiring or connectors in the TPS circuit, a stuck throttle body, or issues with the ECM.

4. Can I drive my 2015 Chevrolet Silverado with the P0123 code?

While the truck may still be drivable, it could enter reduced power mode or experience performance issues. Driving for an extended period without addressing the issue could cause further damage.

5. How do I diagnose the P0123 code on a 2015 Chevrolet Silverado?

Start by inspecting the TPS wiring and connectors for damage or corrosion. Use a multimeter to test the TPS voltage output. If no wiring issues are found, the sensor or ECM may require further testing.

6. How is the P0123 code repaired on a 2015 Chevrolet Silverado?

Repairs may involve replacing the throttle position sensor, repairing damaged wiring, cleaning the throttle body, or reprogramming or replacing the ECM if necessary.

7. What tools do I need to fix a P0123 code on a 2015 Chevrolet Silverado?

Youâ€™ll need a scan tool or OBDII scanner, a multimeter for electrical testing, and basic tools to access and replace the throttle position sensor or wiring.

8. How much does it cost to fix the P0123 code on a 2015 Chevrolet Silverado?

The cost varies depending on the repair. Replacing a throttle position sensor typically costs $100-$300, including parts and labor, while more extensive wiring or ECM repairs may cost more.

9. Can a dirty throttle body cause the P0123 code in a 2015 Chevrolet Silverado?

Yes, a dirty or sticking throttle body can cause erratic voltage readings, leading to a P0123 code. Cleaning the throttle body may resolve the issue.

10. Will clearing the code fix P0123 on a 2015 Chevrolet Silverado?

Clearing the code may temporarily reset the check engine light, but it wonâ€™t solve the underlying issue. Proper diagnosis and repair are required to prevent the code from returning.