AutoCodes – Chevrolet – P0122 2018 Chevrolet Silverado

P0122 2018 Chevrolet Silverado Code - Throttle Position Sensor 1 Circuit Low 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: P0122 2018 Chevrolet Silverado indicates Throttle Position Sensor 1 Circuit Low 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 508

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 P0122 2018 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 less than 0.32 V for greater than 1 s.

OBDII Code P0122 2018 Chevrolet Silverado - Throttle Position Sensor 1 Circuit Low Voltage - AutoCodes.com — P0122 2018 Chevrolet Silverado Code - Throttle Position Sensor 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0122 2018 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 P0122 2018 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 P0122 2018 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 P0122 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0122 in a 2018 Chevrolet Silverado?

The common symptoms include poor acceleration, stalling, rough idling, and the vehicle going into limp mode.

2. What does the OBDII code P0122 indicate in a 2018 Chevrolet Silverado?

The code P0122 indicates an issue with the Throttle Position Sensor 1 Circuit, specifically low voltage being detected by the vehicle's onboard diagnostics system.

3. What are the possible causes of OBDII code P0122 in a 2018 Chevrolet Silverado?

Possible causes of P0122 include a faulty throttle position sensor, damaged wiring or connectors in the circuit, or issues with the vehicle's ECM (Engine Control Module).

4. How can I diagnose the cause of OBDII code P0122 in my 2018 Chevrolet Silverado?

To diagnose P0122, you can use a scan tool to read the code and check the voltage output of the throttle position sensor. Inspect the wiring and connectors for any damage or corrosion as well.

5. Can I drive my 2018 Chevrolet Silverado with OBDII code P0122?

It is not recommended to drive your vehicle with P0122 as it can lead to poor performance and potential safety hazards. It's best to address the issue promptly.

6. How can I repair OBDII code P0122 in my 2018 Chevrolet Silverado?

Repairing P0122 may involve replacing the throttle position sensor, repairing any damaged wiring or connectors, or resetting the ECM to clear the code.

7. Will resetting the ECM clear OBDII code P0122 in a 2018 Chevrolet Silverado?

Resetting the ECM may temporarily clear the code, but if the underlying issue causing P0122 is not resolved, the code is likely to reappear.

8. Can a dirty throttle body cause OBDII code P0122 in a 2018 Chevrolet Silverado?

While a dirty throttle body can affect throttle response, P0122 specifically points to issues with the throttle position sensor circuit rather than the throttle body itself.

9. How much does it cost to fix OBDII code P0122 in a 2018 Chevrolet Silverado?

The cost to fix P0122 can vary depending on the exact cause of the issue. It may range from a few hundred dollars for parts and labor to over a thousand if more extensive repairs are needed.

10. Is OBDII code P0122 a common issue in 2018 Chevrolet Silverado vehicles?

While not extremely common, P0122 can occur in 2018 Chevrolet Silverado vehicles due to various factors like sensor wear, wiring issues, or ECM malfunctions. Regular maintenance can help prevent such issues.