AutoCodes – GMC – P1F5D GMC

P1F5D GMC Code - 14 Volt Power Module L-Terminal Circuit Low Voltage

Quick Answer

The Engine Control Module (ECM) uses two circuits to control and monitor the state of the 14V power module, often referred to as the accessory DC power control module. Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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: P1F5D GMC indicates 14 Volt Power Module L-Terminal Circuit Low Voltage.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) 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 684

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 Apr 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1F5D GMC Description

The Engine Control Module (ECM) uses two circuits to control and monitor the state of the 14V power module, often referred to as the accessory DC power control module. The control circuit functions much like the L Terminal circuit on a generator equipped vehicle. A high side driver in the ECM applies a duty cycled voltage to the 14V power module. The duty cycle controls the 14V power module output. The ECM monitors the state of the 14V power module control circuit. The ECM will detect faults on the 14V power module control circuit when the vehicle is ON.

OBDII Code P1F5D GMC - 14 Volt Power Module L-Terminal Circuit Low Voltage - AutoCodes.com — P1F5D GMC Code - 14 Volt Power Module L-Terminal Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1F5D GMC?

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

How to Fix the DTC P1F5D GMC?

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 P1F5D GMC 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 P1F5D GMC 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 P1F5D GMC Code

1. What are common symptoms of the OBDII code P1F5D GMC (14 Volt Power Module L-Terminal Circuit Low Voltage)?

The common symptoms include dim or flickering lights, electrical system malfunctions, and difficulty starting the vehicle.

2. What can cause the P1F5D GMC trouble code to appear?

The P1F5D code is typically triggered by a low voltage condition in the 14 Volt Power Module L-Terminal Circuit, which can be caused by issues such as a faulty power module, damaged wiring, or poor electrical connections.

3. How can I diagnose the root cause of the P1F5D GMC code?

To diagnose the issue, you can use a multimeter to test the voltage levels in the L-Terminal circuit of the 14 Volt Power Module. Check for any loose connections, damaged wiring, or a malfunctioning power module.

4. What are some repair tips for addressing the P1F5D trouble code?

Start by inspecting the wiring and connections in the L-Terminal circuit. Repair or replace any damaged components, and ensure all connections are secure. If the issue persists, consider replacing the 14 Volt Power Module.

5. Can I drive my vehicle with the P1F5D GMC trouble code?

It is not recommended to drive your vehicle with the P1F5D trouble code present, as it can lead to further electrical system issues and potentially cause the vehicle to stall or not start.

6. How serious is the P1F5D GMC trouble code?

While the P1F5D code may not cause immediate safety concerns, it should be addressed promptly to prevent potential electrical system failures and ensure the proper functioning of your vehicle.

7. Is it possible to clear the P1F5D trouble code without fixing the underlying issue?

Clearing the trouble code without addressing the root cause will only temporarily turn off the check engine light. The issue will likely reappear if the underlying problem is not fixed.

8. Can a DIY enthusiast fix the P1F5D GMC trouble code?

Depending on your skill level and access to tools, you may be able to diagnose and repair the issue causing the P1F5D trouble code. However, for complex electrical problems, it is recommended to seek professional help.

9. How much does it cost to repair the P1F5D trouble code?

The cost of repairing the P1F5D code can vary depending on the cause of the issue, the parts needed for repair, and labor costs. It is advisable to obtain quotes from mechanics or repair shops for an accurate estimate.

10. Will the P1F5D trouble code cause my vehicle to fail an emissions test?

If the P1F5D code is present during an emissions test, it may cause your vehicle to fail. It is important to address the issue promptly to ensure your vehicle meets emissions standards.