AutoCodes – GMC – P1F5E GMC

P1F5E GMC Code - 14 Volt Power Module L-Terminal Circuit High 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: P1F5E GMC indicates 14 Volt Power Module L-Terminal Circuit High 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 799

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 P1F5E 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 P1F5E GMC - 14 Volt Power Module L-Terminal Circuit High Voltage - AutoCodes.com — P1F5E GMC Code - 14 Volt Power Module L-Terminal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1F5E 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 P1F5E 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 P1F5E 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 P1F5E 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 P1F5E GMC Code

1. What are the common symptoms of OBDII code P1F5E GMC?

The common symptoms of code P1F5E GMC include illuminated check engine light, reduced engine power, and potential issues with the vehicle's electrical system.

2. What does the 14 Volt Power Module L-Terminal Circuit High Voltage mean?

This code indicates that the voltage on the L-terminal circuit of the 14 Volt Power Module is higher than normal, which can lead to various electrical system malfunctions.

3. What are the possible causes of OBDII code P1F5E GMC?

Possible causes of code P1F5E GMC include a faulty 14 Volt Power Module, damaged wiring in the L-terminal circuit, loose connections, or issues with the vehicle's electrical system.

4. How can I diagnose the cause of OBDII code P1F5E GMC?

Diagnosing code P1F5E GMC typically involves conducting a thorough inspection of the 14 Volt Power Module, checking the wiring and connections in the L-terminal circuit, and using a multimeter to measure voltage levels.

5. Can I still drive my vehicle with OBDII code P1F5E GMC?

It is not recommended to drive your vehicle with code P1F5E GMC present, as it can lead to further electrical system issues and potential engine damage. It is best to address the problem promptly.

6. How serious is OBDII code P1F5E GMC?

Code P1F5E GMC should be taken seriously as it indicates a problem with the vehicle's electrical system, which can potentially affect the overall performance and safety of the vehicle if left unresolved.

7. How can I repair OBDII code P1F5E GMC?

Repairing code P1F5E GMC often involves replacing the faulty 14 Volt Power Module, repairing or replacing damaged wiring, ensuring all connections are secure, and clearing the trouble code with a diagnostic tool.

8. Can a DIY enthusiast fix OBDII code P1F5E GMC?

While some DIY enthusiasts may have the skills to address code P1F5E GMC, it is recommended to consult a professional mechanic or technician for proper diagnosis and repair to ensure the issue is resolved correctly.

9. How much does it cost to fix OBDII code P1F5E GMC?

The cost of fixing code P1F5E GMC can vary depending on the extent of the problem, parts needed for repair, and labor costs. It is advisable to obtain quotes from different repair shops for an accurate estimate.

10. Is it necessary to reset the trouble code after repairing OBDII code P1F5E GMC?

Yes, it is important to reset the trouble code using a diagnostic tool after repairing code P1F5E GMC to clear the vehicle's system of the fault and ensure proper functionality.