AutoCodes – GMC – P151A 2017 GMC Sierra

P151A 2017 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 2017 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 158

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 2017 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 2017 GMC Sierra - Throttle Actuator Control Signal Message Counter Incorrect - AutoCodes.com — P151A 2017 GMC Sierra Code - Throttle Actuator Control Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P151A 2017 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 2017 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 2017 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 2017 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 2017 GMC Sierra Code

1. What does the OBDII code P151A mean on a 2017 GMC Sierra?

P151A indicates an issue with the throttle actuator control (TAC) system, specifically that the signal message counter is incorrect, potentially due to communication or sensor errors.

2. What are the common symptoms of code P151A in a 2017 GMC Sierra?

Symptoms may include reduced engine power, the Check Engine Light illuminating, poor throttle response, or the vehicle entering "limp mode."

3. What causes the P151A code in a GMC Sierra?

Common causes include a faulty throttle body, wiring or connector issues in the TAC system, a failing accelerator pedal position sensor, or a malfunction in the engine control module (ECM).

4. Can I drive my 2017 GMC Sierra with the P151A code?

Driving with the P151A code is not recommended, as it can cause reduced performance and may lead to unsafe driving conditions due to limited throttle control.

5. How do I diagnose the P151A code on a 2017 GMC Sierra?

Diagnosis typically involves inspecting the wiring and connectors for the throttle actuator, testing the accelerator pedal position sensor, and using a scan tool to monitor throttle-related data.

6. What parts might need to be replaced to fix the P151A code?

Possible parts to replace include the throttle body, accelerator pedal position sensor, TAC module, or damaged wiring/connectors.

7. Can a dirty throttle body cause the P151A code?

Yes, a dirty or obstructed throttle body can cause improper throttle actuator operation, potentially triggering the P151A code.

8. How much does it cost to fix the P151A code on a GMC Sierra?

Repair costs vary but can range from $100 to $600, depending on whether cleaning, wiring repair, or part replacement (like the throttle body) is required.

9. Can a software update fix the P151A code?

In some cases, a software update for the engine control module (ECM) may address communication issues and resolve the P151A code.

10. Do I need professional help to fix the P151A code on my 2017 GMC Sierra?

While some issues like cleaning the throttle body may be DIY-friendly, diagnosing and repairing wiring or module issues often requires professional tools and expertise.