AutoCodes – GMC – P12A6 2018 GMC Sierra

P12A6 2018 GMC Sierra Code - Fuel Pump Driver Control Module Enable Circuit Performance

Quick Answer

The Engine Control Module (ECM) provides ignition voltage to the Fuel Pump Driver Control Module whenever the engine is cranking or running. Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver 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: P12A6 2018 GMC Sierra indicates Fuel Pump Driver Control Module Enable Circuit Performance.
Common causes: Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver 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 459

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 13, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P12A6 2018 GMC Sierra Description

The Engine Control Module (ECM) provides ignition voltage to the Fuel Pump Driver Control Module whenever the engine is cranking or running. The ECM enables the Fuel Pump Driver Control Module as long as the engine is cranking or running, and ignition system reference pulses are received. While this enables voltage is being received, the Fuel Pump Driver Control Module supplies a varying voltage to the fuel tank fuel pump module in order to maintain the desired fuel line pressure. The Diagnostic Trouble Code (DTC) will be set if the ECM state of the fuel pump enable circuit does not match the state of the fuel pump enable circuit sensed by the fuel pump driver control module for greater than 0.5 s.

OBDII Code P12A6 2018 GMC Sierra - Fuel Pump Driver Control Module Enable Circuit Performance - AutoCodes.com — P12A6 2018 GMC Sierra Code - Fuel Pump Driver Control Module Enable Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P12A6 2018 GMC Sierra?

Faulty Fuel Pump Driver Control Module
Fuel Pump Driver Control Module harness is open or shorted
Fuel Pump Driver Control Module circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P12A6 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 P12A6 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 P12A6 2018 GMC Sierra code?

Need more information on how to fix the P12A6 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P12A6 2018 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 P12A6 2018 GMC Sierra Code

1. What does the OBDII code P12A6 mean on a 2018 GMC Sierra?

The P12A6 code indicates an issue with the Fuel Pump Driver Control Module Enable Circuit's performance, which manages the fuel pump's operation.

2. What are the symptoms of the P12A6 code in a 2018 GMC Sierra?

Common symptoms include the check engine light being on, difficulty starting the engine, poor fuel efficiency, or reduced engine performance.

3. What causes the P12A6 code to appear?

The code can be caused by a faulty Fuel Pump Driver Control Module, damaged wiring or connectors in the enable circuit, or a malfunctioning fuel pump.

4. Can I drive my 2018 GMC Sierra with the P12A6 code?

Driving with this code is not recommended, as it could lead to further damage or cause the vehicle to stall unexpectedly.

5. How is the P12A6 code diagnosed?

A mechanic will use a scan tool to verify the code, inspect the wiring and connectors, and test the Fuel Pump Driver Control Module and related components for proper operation.

6. How do I fix the P12A6 code on a 2018 GMC Sierra?

Repairs may include replacing the Fuel Pump Driver Control Module, repairing damaged wiring or connectors, or addressing fuel pump issues.

7. Is the P12A6 code a common problem in the 2018 GMC Sierra?

While not extremely common, it can occur in GMC vehicles due to wear and tear or electrical issues within the fuel system.

8. How much does it cost to repair the P12A6 code?

The repair cost varies but typically ranges from $200 to $600, depending on whether the module, wiring, or fuel pump needs replacement.

9. Can a weak battery cause the P12A6 code?

Yes, a weak or failing battery can lead to voltage issues, potentially triggering problems with the Fuel Pump Driver Control Module.

10. How can I prevent the P12A6 code from recurring?

Regular maintenance, inspecting wiring for damage, and ensuring the fuel system components are in good condition can help prevent the code from recurring.