AutoCodes – GMC – P151A 2018 GMC Sierra

P151A 2018 GMC Sierra Code - Throttle Actuator Control Signal Message Counter Incorrect

Quick Answer

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Throttle Actuator Control (TAC) Module, Throttle Actuator Control Module harness is open or shorted, Throttle Actuator Control Module 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: P151A 2018 GMC Sierra indicates Throttle Actuator Control Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Throttle Actuator Control (TAC) Module, Throttle Actuator Control Module harness is open or shorted, Throttle Actuator Control Module 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 188

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 28, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P151A 2018 GMC Sierra Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the Throttle Actuator Control (TAC) Signal Message Counter is Incorrect.

OBDII Code P151A 2018 GMC Sierra - Throttle Actuator Control Signal Message Counter Incorrect - AutoCodes.com — P151A 2018 GMC Sierra Code - Throttle Actuator Control Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P151A 2018 GMC Sierra?

Faulty Throttle Actuator Control (TAC) Module
Throttle Actuator Control Module harness is open or shorted
Throttle Actuator Control Module circuit poor electrical connection

How to Fix the DTC P151A 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P151A 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 P151A 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 P151A 2018 GMC Sierra Code

1. What are common symptoms of OBDII code P151A in a 2018 GMC Sierra?

- Common symptoms include reduced engine power, rough idle, stalling, and the Check Engine light illuminating.

2. What does the OBDII code P151A on a 2018 GMC Sierra mean?

- The code indicates that the Throttle Actuator Control (TAC) system has detected a discrepancy in the signal message counter.

3. What are possible causes of the P151A code in a 2018 GMC Sierra?

- Possible causes include a faulty throttle body, damaged wiring or connectors in the TAC system, software issues, or a malfunctioning electronic control module (ECM).

4. How can I diagnose the P151A code in my 2018 GMC Sierra?

- Diagnosing the code may involve performing a thorough inspection of the throttle body, checking for damaged wiring, and using a scan tool to monitor TAC system data.

5. Can I still drive my 2018 GMC Sierra with the P151A code present?

- It is not recommended to continue driving with the P151A code present, as it can lead to unsafe driving conditions and potential damage to the vehicle.

6. How can I repair the P151A code in my 2018 GMC Sierra?

- Repair options may include replacing the throttle body, repairing damaged wiring or connectors, updating software, or replacing the ECM if necessary.

7. Is it possible to reset the P151A code in a 2018 GMC Sierra without repairs?

- While clearing the code may temporarily turn off the Check Engine light, it is important to address the underlying issue causing the code to prevent further problems.

8. Can a DIY enthusiast fix the P151A code in a 2018 GMC Sierra?

- Depending on the root cause of the code, some DIY enthusiasts may be able to address the issue by replacing the throttle body or repairing wiring under proper guidance.

9. How much does it cost to repair the P151A code in a 2018 GMC Sierra at a dealership?

- Repair costs at a dealership can vary but may include labor charges, parts costs, and diagnostic fees, so it's advisable to get a detailed estimate before proceeding.

10. Will the P151A code in a 2018 GMC Sierra affect fuel efficiency?

- Yes, the P151A code can lead to poor fuel efficiency due to issues with the throttle control system, which can impact the engine's performance and fuel consumption.