AutoCodes – GMC – P16A1 2018 GMC Sierra

P16A1 2018 GMC Sierra Code - Throttle Position Sensor Communication 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: P16A1 2018 GMC Sierra indicates Throttle Position Sensor Communication 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 354

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on May 20, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P16A1 2018 GMC Sierra 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 a high voltage circuit condition on the throttle position sensor signal circuit for greater than 1 s.

OBDII Code P16A1 2018 GMC Sierra - Throttle Position Sensor Communication Circuit High Voltage - AutoCodes.com — P16A1 2018 GMC Sierra Code - Throttle Position Sensor Communication Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P16A1 2018 GMC Sierra?

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 P16A1 2018 GMC Sierra?

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 P16A1 2018 GMC Sierra 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 P16A1 2018 GMC Sierra 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 P16A1 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P16A1 in a 2018 GMC Sierra?

The common symptoms of code P16A1 include rough idling, reduced engine power, poor acceleration, and the illumination of the Check Engine Light.

2. What can cause the Throttle Position Sensor Communication Circuit High Voltage error code in a 2018 GMC Sierra?

The P16A1 code in a 2018 GMC Sierra is typically triggered by a faulty throttle position sensor, wiring issues in the communication circuit, or a problem with the engine control module (ECM).

3. How can I diagnose the Throttle Position Sensor Communication Circuit High Voltage issue in my 2018 GMC Sierra?

Diagnosing the P16A1 code involves checking the throttle position sensor's voltage readings, inspecting the sensor's wiring for any damage, and scanning the ECM for related error codes.

4. Can I drive my 2018 GMC Sierra with the P16A1 code present?

It is not recommended to drive your GMC Sierra with the P16A1 code active, as it can lead to poor performance, potential engine damage, and safety risks. It is advisable to address the issue promptly.

5. What are the repair options for resolving the Throttle Position Sensor Communication Circuit High Voltage code in a 2018 GMC Sierra?

Repair options for the P16A1 code may include replacing the faulty throttle position sensor, repairing damaged wiring connections, or reprogramming the ECM to address communication issues.

6. How much does it typically cost to fix the P16A1 error code in a 2018 GMC Sierra?

The cost of repairing the P16A1 code in a 2018 GMC Sierra can vary depending on the specific cause of the issue, but it may range from $100 to $300 for parts and labor.

7. Are there any preventive maintenance measures to avoid the Throttle Position Sensor Communication Circuit High Voltage code in a 2018 GMC Sierra?

Regularly checking and maintaining the throttle position sensor, ensuring proper wiring connections, and promptly addressing any engine performance issues can help prevent the occurrence of the P16A1 code.

8. Will disconnecting the battery reset the P16A1 code in my 2018 GMC Sierra?

Disconnecting the battery may temporarily clear the error code, but it is not a recommended long-term solution. The underlying issue causing the P16A1 code needs to be diagnosed and repaired for a permanent fix.

9. Can a DIY enthusiast fix the Throttle Position Sensor Communication Circuit High Voltage error in a 2018 GMC Sierra?

Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to address the P16A1 code by following repair guides, but professional diagnosis and repair may be necessary for accurate resolution.

10. How urgent is it to address the P16A1 code in a 2018 GMC Sierra?

It is important to address the P16A1 code promptly to prevent further damage to the engine, ensure optimal vehicle performance, and maintain safety on the road.