AutoCodes – GMC – P151A 2016 GMC Sierra

P151A 2016 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 2016 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 136

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 2016 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 2016 GMC Sierra - Throttle Actuator Control Signal Message Counter Incorrect - AutoCodes.com — P151A 2016 GMC Sierra Code - Throttle Actuator Control Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P151A 2016 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 2016 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 2016 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 2016 GMC Sierra code?

Need more information on how to fix the P151A 2016 GMC Sierra code? Get Access to Factory Service Manuals

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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 2016 GMC Sierra Code

1. What does the OBDII code P151A mean on a 2016 GMC Sierra?

The code P151A indicates an issue with the Throttle Actuator Control (TAC) system, specifically a mismatch in the signal message counter sent between the throttle body and the engine control module (ECM).

2. What are the common symptoms of the P151A code on a 2016 GMC Sierra?

Symptoms may include reduced engine power, poor throttle response, an illuminated check engine light, and potentially the vehicle entering "limp mode."

3. What causes the P151A code to appear on a 2016 GMC Sierra?

Common causes include a malfunctioning throttle body, wiring or connection issues in the TAC system, a faulty ECM, or software issues requiring a reprogram.

4. Can I drive my 2016 GMC Sierra with the P151A code?

Driving with this code is not recommended, as it may result in reduced engine power and impact drivability, potentially leaving you stranded.

5. How do I diagnose the P151A code on a 2016 GMC Sierra?

Diagnosis involves inspecting the throttle body, checking TAC system wiring and connectors, and scanning for related codes to identify any underlying issues.

6. How can I fix the P151A code on my 2016 GMC Sierra?

Repairs may include cleaning or replacing the throttle body, repairing damaged wiring or connectors, or reprogramming or replacing the ECM as needed.

7. Does the P151A code require throttle body replacement on a 2016 GMC Sierra?

Not always. The throttle body should first be inspected and cleaned. Replacement is only necessary if it's determined to be faulty.

8. Can a software update fix the P151A code on a 2016 GMC Sierra?

Yes, in some cases, a software update for the ECM can resolve the issue if itâ€™s caused by a programming error.

9. What tools are needed to diagnose the P151A code on a 2016 GMC Sierra?

A professional OBDII scan tool, a multimeter for testing wiring, and access to the vehicleâ€™s service manual are typically needed for accurate diagnosis.

10. How much does it cost to fix the P151A code on a 2016 GMC Sierra?

Repair costs vary depending on the root cause but may range from $100 for cleaning or minor repairs to $500 or more for throttle body replacement or ECM reprogramming.