AutoCodes – GMC – P151A 2015 GMC Sierra

P151A 2015 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 2015 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 150

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 2015 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 2015 GMC Sierra - Throttle Actuator Control Signal Message Counter Incorrect - AutoCodes.com — P151A 2015 GMC Sierra Code - Throttle Actuator Control Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P151A 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra Code

1. What does the OBDII code P151A mean on a 2015 GMC Sierra?

P151A indicates an issue with the throttle actuator control system, specifically that the signal message counter from the throttle body is incorrect or out of range.

2. What are the common symptoms of the P151A code?

Symptoms may include reduced engine performance, activation of "limp mode," a check engine light, poor throttle response, and possible stalling.

3. What causes the P151A code to appear?

Common causes include a faulty throttle body, wiring or connector issues in the throttle actuator circuit, a failing powertrain control module (PCM), or software glitches.

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

Yes, carbon buildup or debris in the throttle body can interfere with its operation and cause the P151A code.

5. How can I diagnose the P151A code on my GMC Sierra?

Start by inspecting the throttle body and its wiring for damage or corrosion. Use a scan tool to monitor throttle position sensor data and check for related codes.

6. Is it safe to drive with the P151A code active?

Driving with this code is not recommended because it can lead to reduced performance, safety issues, or further damage to the vehicle.

7. How do I fix the P151A code?

Repairs may involve cleaning or replacing the throttle body, repairing damaged wiring or connectors, or updating the PCM software. In some cases, the PCM may need to be replaced.

8. What tools are needed to fix the P151A code?

You'll typically need a scan tool, multimeter, throttle body cleaner, and basic hand tools to diagnose and resolve this issue.

9. Can a software update resolve the P151A code?

Yes, if the issue is related to a PCM software glitch, updating the software through a dealership or qualified technician may resolve the problem.

10. How much does it cost to repair the P151A code?

Repair costs can vary widely. Cleaning the throttle body may cost $100â€“$200, while replacing the throttle body or PCM can range from $500â€“$1,500 depending on parts and labor.