AutoCodes – Generic – P1F5E

P1F5E 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 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 1,044

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 Apr 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1F5E 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 - 14 Volt Power Module L-Terminal Circuit High Voltage - AutoCodes.com — P1F5E Code - 14 Volt Power Module L-Terminal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1F5E?

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?

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 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 code?

Need more information on how to fix the P1F5E code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P1F5E Buick — 14 Volt Power Module L-Terminal Circuit High Voltage
P1F5E Cadillac — 14 Volt Power Module L-Terminal Circuit High Voltage
P1F5E Chevrolet — 14 Volt Power Module L-Terminal Circuit High Voltage
P1F5E GMC — 14 Volt Power Module L-Terminal Circuit High Voltage
P1F5E Saturn — 14 Volt Power Module L-Terminal Circuit High Voltage

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 Code

1. What are the common symptoms of OBDII code P1F5E (14 Volt Power Module L-Terminal Circuit High Voltage)?

- Common symptoms include illuminated Check Engine Light, decreased fuel efficiency, and potential issues with the vehicle's electrical systems.

2. What are the possible causes of OBDII code P1F5E?

- Potential causes of this code include a faulty 14 Volt Power Module, damaged wiring or connectors in the L-Terminal circuit, or issues with the vehicle's battery.

3. How can I diagnose OBDII code P1F5E?

- Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the 14 Volt Power Module and related components, and testing the voltage in the L-Terminal circuit.

4. What are the recommended repair tips for OBDII code P1F5E?

- Repair tips may include replacing the 14 Volt Power Module, repairing any damaged wiring or connectors, and ensuring the battery is in good condition.

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

- It is not recommended to drive the vehicle with this code present, as it can lead to further electrical issues and potential damage to the vehicle's systems.

6. How serious is OBDII code P1F5E?

- While the severity can vary, this code should be addressed promptly to prevent potential damage to the vehicle's electrical components and ensure proper functioning.

7. Can I reset OBDII code P1F5E with a simple reset tool?

- A simple reset tool may clear the code temporarily, but it is important to address the underlying issue causing the code for a permanent solution.

8. Is OBDII code P1F5E specific to certain vehicle makes and models?

- This code can be found in various vehicle makes and models equipped with OBDII systems, but the specific diagnostic and repair procedures may vary.

9. How can I prevent OBDII code P1F5E from recurring?

- Regular maintenance, ensuring proper battery health, and promptly addressing any electrical issues can help prevent the recurrence of this code.

10. Should I seek professional help for diagnosing and repairing OBDII code P1F5E?

- Due to the complexity of electrical systems in modern vehicles, consulting a professional mechanic or technician is recommended for accurate diagnosis and repair of this code.