AutoCodes – GMC – P12A8 2017 GMC Sierra

P12A8 2017 GMC Sierra Code - Fuel Pump Control Status 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 Fuel Pump, Fuel Pump harness is open or shorted, Fuel Pump 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: P12A8 2017 GMC Sierra indicates Fuel Pump Control Status Signal Message Counter Incorrect.
Common causes: Common causes include Faulty Fuel Pump, Fuel Pump harness is open or shorted, Fuel Pump 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 268

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 27, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P12A8 2017 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 Fuel Pump Control Status Signal Message Counter is Incorrect.

OBDII Code P12A8 2017 GMC Sierra - Fuel Pump Control Status Signal Message Counter Incorrect - AutoCodes.com — P12A8 2017 GMC Sierra Code - Fuel Pump Control Status Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P12A8 2017 GMC Sierra?

Faulty Fuel Pump
Fuel Pump harness is open or shorted
Fuel Pump circuit poor electrical connection

How to Fix the DTC P12A8 2017 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 P12A8 2017 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 P12A8 2017 GMC Sierra code?

Need more information on how to fix the P12A8 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P12A8 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 P12A8 2017 GMC Sierra Code

1. What does the OBDII code P12A8 mean on a 2017 GMC Sierra?

P12A8 indicates that the fuel pump control module has detected an incorrect status signal message counter, typically related to communication or performance issues.

2. What are common symptoms of the P12A8 code in a 2017 GMC Sierra?

Symptoms may include poor engine performance, difficulty starting, reduced fuel efficiency, or the illumination of the check engine light.

3. What causes the P12A8 code to appear on a 2017 GMC Sierra?

Common causes include a malfunctioning fuel pump control module, wiring issues, poor electrical connections, or software glitches in the module.

4. Can I drive my 2017 GMC Sierra with a P12A8 code?

While the truck may still be drivable, itâ€™s not recommended as it could lead to further engine performance issues or damage.

5. How do I diagnose the P12A8 code on a 2017 GMC Sierra?

Diagnose by using an OBDII scanner to confirm the code, inspecting the fuel pump control module, checking wiring and connections, and testing for proper communication signals.

6. How do I fix the P12A8 code on a 2017 GMC Sierra?

Repairs may involve replacing the fuel pump control module, repairing damaged wiring, updating the moduleâ€™s software, or cleaning and securing electrical connectors.

7. How much does it cost to repair the P12A8 code on a 2017 GMC Sierra?

Costs vary depending on the issue but typically range from $150 to $500, with higher costs if the fuel pump control module needs replacement.

8. Can a software update fix the P12A8 code on a 2017 GMC Sierra?

Yes, in some cases, a software update for the fuel pump control module may resolve the issue if itâ€™s caused by a programming glitch.

9. What tools are needed to troubleshoot the P12A8 code on a 2017 GMC Sierra?

Youâ€™ll need an OBDII scanner, a multimeter for electrical testing, and potentially access to GMC-specific diagnostic software.

10. Does the P12A8 code always mean the fuel pump control module is bad?

No, it could also be caused by wiring issues, poor electrical connections, or communication errors rather than a faulty module. Proper diagnosis is essential.