AutoCodes – GMC – P100A 2018 GMC Sierra

P100A 2018 GMC Sierra Code - Turbocharger Boost 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 Turbocharger Boost Control. 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: P100A 2018 GMC Sierra indicates Turbocharger Boost Control Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Turbocharger Boost Control.
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 218

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 Aug 19, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P100A 2018 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 Turbocharger Boost Control Signal Message Counter is Incorrect.

OBDII Code P100A 2018 GMC Sierra - Turbocharger Boost Control Signal Message Counter Incorrect - AutoCodes.com — P100A 2018 GMC Sierra Code - Turbocharger Boost Control Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P100A 2018 GMC Sierra?

Faulty Turbocharger Boost Control

How to Fix the DTC P100A 2018 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 P100A 2018 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 P100A 2018 GMC Sierra code?

Need more information on how to fix the P100A 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 P100A 2018 GMC Sierra Code

1. What does OBDII code P100A mean on a 2018 GMC Sierra?

P100A indicates that the Turbocharger Boost Control Signal Message Counter is incorrect, meaning the ECM is detecting an issue with the communication or functionality of the turbo boost control system.

2. What are the symptoms of code P100A in a 2018 GMC Sierra?

Common symptoms include reduced engine performance, poor acceleration, decreased fuel efficiency, and possibly an illuminated check engine light.

3. What causes the P100A code to appear on a GMC Sierra?

The primary causes can include faulty turbocharger boost control solenoid, wiring or connector issues, communication errors between the ECM and turbo components, or software glitches in the ECM.

4. Can I still drive my GMC Sierra with a P100A code?

While the vehicle may still be drivable, it is not recommended, as the code can lead to decreased performance and may cause further damage to the turbo system if left unresolved.

5. How do I diagnose the P100A code on my 2018 GMC Sierra?

Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the wiring and connectors for damage or loose connections, and testing the turbocharger boost control solenoid for functionality.

6. What repairs are needed to fix the P100A code?

Repairs may include replacing the turbocharger boost control solenoid, repairing damaged wiring or connectors, reprogramming or updating the ECM, or addressing any underlying turbocharger issues.

7. How much does it cost to fix the P100A code on a GMC Sierra?

Costs can vary depending on the specific issue but generally range from $100 to $500, including parts and labor, with higher costs if the turbocharger itself is involved.

8. Can a software update fix the P100A code?

Yes, in some cases, an ECM software update or reflash may resolve the issue if it's related to a communication error or programming problem.

9. What tools do I need to troubleshoot the P100A code?

Youâ€™ll need an OBDII scanner capable of reading manufacturer-specific codes, a multimeter for testing electrical connections, and possibly a service manual for detailed wiring diagrams.

10. Is the P100A code a common issue for the 2018 GMC Sierra?

While not extremely common, this code can occur in vehicles with turbocharged engines, especially if maintenance on the turbo system or related components has been neglected.