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Engine-Codes – GMC – P151A 2016 GMC Sierra

P151A 2016 GMC Sierra Code - Throttle Actuator Control Signal Message Counter Incorrect

Quick Answer

The P151A diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Throttle Actuator Control (TAC) system has detected an incorrect signal message counter. Common causes include Faulty throttle actuator control module, Wiring issues or poor connections, Sensor malfunctions (e.g., throttle position sensor). 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 module, Wiring issues or poor connections, Sensor malfunctions (e.g., throttle position sensor).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P151A 2016 GMC Sierra Description

The P151A diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that the Throttle Actuator Control (TAC) system has detected an incorrect signal message counter. This code typically points to an issue with the communication between the throttle actuator control module and other related components in the vehicle's electronic throttle control system. The TAC system is responsible for regulating the throttle opening based on driver input, ensuring smooth acceleration and optimal engine performance.

OBDII Code P151A 2016 GMC Sierra - Throttle Actuator Control Signal Message Counter Incorrect
P151A 2016 GMC Sierra Code - Throttle Actuator Control Signal Message Counter Incorrect

Common Causes of P151A 2016 GMC Sierra

  1. Faulty throttle actuator control module
  2. Wiring issues or poor connections
  3. Sensor malfunctions (e.g., throttle position sensor)
  4. Software glitches or calibration errors
  5. Environmental factors (moisture, corrosion)

Symptoms of P151A 2016 GMC Sierra

  1. Erratic throttle response
  2. Engine hesitation during acceleration
  3. Rough idling or stalling
  4. Reduced power or limp mode activation

How to Fix P151A 2016 GMC Sierra

  1. Diagnose the TAC system using a scan tool to retrieve the specific fault codes and data related to the incorrect signal message counter.
  2. Inspect the wiring harness and connections for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the throttle actuator control module and related sensors for proper functionality. Replace any faulty components.
  4. Perform a software update or calibration reset for the TAC system to ensure proper communication and operation.
  5. Clear the DTCs and perform a test drive to verify that the issue has been resolved.

Cost to Fix P151A 2016 GMC Sierra

The typical repair costs for addressing a P151A code in a 2016 GMC Sierra can vary depending on the specific cause of the issue and the labor rates at the repair shop. On average, the parts and labor for this repair could range from $200 to $500. However, it's important to note that diagnostic time, parts prices, and labor rates can vary based on location, vehicle make and model, and the extent of the repairs needed. It's recommended to consult with a trusted mechanic or dealership for a more accurate cost estimate based on your specific situation.

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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 it’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 vehicle’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.

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