AutoCodes – GMC – P12A8 2016 GMC Sierra

P12A8 2016 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 2016 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 244

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 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 Fuel Pump Control Status Signal Message Counter is Incorrect.

OBDII Code P12A8 2016 GMC Sierra - Fuel Pump Control Status Signal Message Counter Incorrect - AutoCodes.com — P12A8 2016 GMC Sierra Code - Fuel Pump Control Status Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P12A8 2016 GMC Sierra?

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

How to Fix the DTC P12A8 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 P12A8 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 P12A8 2016 GMC Sierra code?

Need more information on how to fix the P12A8 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 P12A8 2016 GMC Sierra Code

1. What does OBDII code P12A8 mean on a 2016 GMC Sierra?

Code P12A8 indicates an issue with the Fuel Pump Control Module (FPCM), where the status signal message counter is incorrect or out of range.

2. What are the common symptoms of code P12A8 on a 2016 GMC Sierra?

Symptoms may include difficulty starting the engine, reduced fuel efficiency, rough idling, and potential stalling during operation.

3. What causes the P12A8 code to appear?

Common causes include a faulty Fuel Pump Control Module, wiring issues such as damaged or corroded connections, or software glitches in the FPCM.

4. Can a bad fuel pump trigger code P12A8?

While a malfunctioning fuel pump itself is not the direct cause, issues with the Fuel Pump Control Module communicating with the pump can result in this code.

5. How is P12A8 diagnosed on a 2016 GMC Sierra?

A technician will use a scan tool to confirm the code, inspect wiring and connectors for damage, and test the Fuel Pump Control Module for proper function.

6. Can I drive my 2016 GMC Sierra with code P12A8?

Driving with this code is not recommended, as it can lead to engine performance issues and potentially cause the vehicle to stall, posing a safety risk.

7. How do I fix the P12A8 code on a 2016 GMC Sierra?

Repairs may include replacing the Fuel Pump Control Module, addressing wiring or connector issues, and updating the FPCM software if necessary.

8. Is the P12A8 code a common problem for the 2016 GMC Sierra?

While not extremely common, it can occur due to wear and tear, electrical issues, or software-related problems in the fuel system.

9. How much does it cost to repair code P12A8 on a 2016 GMC Sierra?

Repair costs can vary, but replacing the Fuel Pump Control Module typically ranges from $300 to $800, depending on labor and parts.

10. Will clearing the P12A8 code solve the problem?

Clearing the code without addressing the underlying issue may temporarily turn off the check engine light, but the problem will likely return until the root cause is fixed.