AutoCodes – Chevrolet – P151A 2018 Chevrolet Silverado

P151A 2018 Chevrolet Silverado 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 Chevrolet Silverado 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 233

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 Chevrolet Silverado 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 Chevrolet Silverado - Throttle Actuator Control Signal Message Counter Incorrect - AutoCodes.com — P151A 2018 Chevrolet Silverado Code - Throttle Actuator Control Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P151A 2018 Chevrolet Silverado?

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 Chevrolet Silverado?

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 Chevrolet Silverado 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 Chevrolet Silverado code?

Need more information on how to fix the P151A 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code

1. What does the OBD-II code P151A mean on a 2018 Chevrolet Silverado?

P151A indicates that the throttle actuator control signal message counter is incorrect, meaning the communication between the throttle body and the engine control module (ECM) is disrupted or inconsistent.

2. What are the common symptoms of code P151A in a Chevy Silverado?

Symptoms may include reduced engine power, a lit check engine light, poor throttle response, or the vehicle entering "limp mode."

3. What causes the P151A code to appear?

Common causes include a faulty throttle body, wiring or connector issues, a malfunctioning engine control module (ECM), or software glitches.

4. Can I drive my Silverado with the P151A code?

Driving with this code is not recommended because it can lead to reduced engine performance and unsafe driving conditions due to throttle control issues.

5. How do I diagnose the P151A trouble code?

Start by inspecting the throttle body wiring and connectors for damage or corrosion. Use a scan tool to monitor throttle actuator control data and verify the signal integrity.

6. What repairs are typically needed for the P151A code?

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

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

Yes, a dirty or carbon-clogged throttle body can disrupt throttle actuator signals and trigger the P151A code.

8. How much does it cost to fix the P151A code on a 2018 Silverado?

Repair costs vary but may range from $100 to $500 depending on whether the throttle body needs cleaning or replacement, or if wiring or ECM repairs are required.

9. Will clearing the P151A code with a scan tool fix the issue?

Clearing the code may temporarily turn off the check engine light, but the issue will likely return unless the underlying problem is resolved.

10. Is a software update required to fix the P151A code?

In some cases, a software update for the ECM may resolve communication issues and eliminate the P151A code. Check with a certified technician to confirm.