AutoCodes – GMC – P15AF 2014 GMC Sierra

P15AF 2014 GMC Sierra Code - Fuel Injector Control Module System Voltage High Voltage

Quick Answer

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Common causes include Faulty Fuel Injector Control Module, Fuel Injector Control Module harness is open or shorted, Fuel Injector 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: P15AF 2014 GMC Sierra indicates Fuel Injector Control Module System Voltage High Voltage.
Common causes: Common causes include Faulty Fuel Injector Control Module, Fuel Injector Control Module harness is open or shorted, Fuel Injector 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 184

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 23, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P15AF 2014 GMC Sierra Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. The Diagnostic Trouble Code (DTC) will be set when the Fuel Injector Control Module detects a system voltage below or above a threshold.

OBDII Code P15AF 2014 GMC Sierra - Fuel Injector Control Module System Voltage High Voltage - AutoCodes.com — P15AF 2014 GMC Sierra Code - Fuel Injector Control Module System Voltage High Voltage

What does this mean?

What are the Possible Causes of the DTC P15AF 2014 GMC Sierra?

Faulty Fuel Injector Control Module
Fuel Injector Control Module harness is open or shorted
Fuel Injector Control Module circuit poor electrical connection

How to Fix the DTC P15AF 2014 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 P15AF 2014 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 P15AF 2014 GMC Sierra code?

Need more information on how to fix the P15AF 2014 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 P15AF 2014 GMC Sierra Code

1. What does the OBDII code P15AF mean on a 2014 GMC Sierra?

P15AF indicates that the Fuel Injector Control Module (FICM) is detecting a higher-than-expected voltage in the system.

2. What are the common symptoms of the P15AF code?

Symptoms may include engine misfires, poor acceleration, reduced fuel efficiency, rough idling, or the check engine light being illuminated.

3. What causes the P15AF code to appear?

Common causes include a malfunctioning Fuel Injector Control Module, wiring issues like shorts or damaged connectors, or a failing alternator supplying excessive voltage.

4. Can I drive my 2014 GMC Sierra with the P15AF code?

Driving with the P15AF code is not recommended, as it may cause further damage to the fuel injection system or engine.

5. How is the P15AF code diagnosed?

A technician will use a scan tool to confirm the code, inspect the FICM wiring and connectors, test the alternator output, and potentially check the FICM itself for faults.

6. How do you fix the P15AF code on a 2014 GMC Sierra?

Repairs may involve replacing the Fuel Injector Control Module, repairing damaged wiring or connectors, or addressing voltage issues from the alternator.

7. How much does it cost to repair a P15AF code?

The cost varies but can range from $200 to $900 depending on whether the FICM or other components need replacement.

8. Can a dead or weak battery cause the P15AF code?

Not typically, but voltage irregularities from a failing alternator or incorrect electrical modifications could contribute to the issue.

9. Will clearing the P15AF code fix the problem?

Clearing the code without addressing the underlying issue will only temporarily turn off the check engine light, and the problem is likely to return.

10. How can I prevent the P15AF code from recurring?

Regularly inspect and maintain the electrical system, ensure proper alternator operation, and avoid aftermarket modifications that could affect the FICM.