AutoCodes – Generic – P1F5B

P1F5B Code - 14 Volt Power Module Status Terminal Circuit High Voltage

Quick Answer

The 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 14 Volt Power Module, 14 Volt Power Module harness is open or shorted, 14 Volt Power 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: P1F5B indicates 14 Volt Power Module Status Terminal Circuit High Voltage.
Common causes: Common causes include Faulty 14 Volt Power Module, 14 Volt Power Module harness is open or shorted, 14 Volt Power 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 1,317

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 P1F5B Description

The 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 status circuit functions much like the F Terminal circuit on a generator equipped vehicle. A high side driver in the 14V power module applies a duty cycled voltage to the ECM. The duty cycle indicates 14V power module internal temperature and operational condition. The ECM will detect faults on the 14V power module status circuit when the vehicle is ON.

OBDII Code P1F5B - 14 Volt Power Module Status Terminal Circuit High Voltage - AutoCodes.com — P1F5B Code - 14 Volt Power Module Status Terminal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1F5B?

Faulty 14 Volt Power Module
14 Volt Power Module harness is open or shorted
14 Volt Power Module circuit poor electrical connection

How to Fix the DTC P1F5B?

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 P1F5B 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 P1F5B code?

Need more information on how to fix the P1F5B code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P1F5B Buick — 14 Volt Power Module Status Terminal Circuit High Voltage
P1F5B Cadillac — 14 Volt Power Module Status Terminal Circuit High Voltage
P1F5B Chevrolet — 14 Volt Power Module Status Terminal Circuit High Voltage
P1F5B GMC — 14 Volt Power Module Status Terminal Circuit High Voltage
P1F5B Saturn — 14 Volt Power Module Status 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 P1F5B Code

1. What does the OBDII code P1F5B mean?

P1F5B indicates a high voltage issue in the 14-volt power module status terminal circuit, which is related to the vehicle's low-voltage power supply system.

2. What are the common symptoms of code P1F5B?

Symptoms may include a check engine light, reduced fuel efficiency, difficulty starting the vehicle, or malfunctioning electrical components.

3. What causes the P1F5B code to trigger?

Possible causes include a faulty 14-volt power module, damaged wiring or connectors, or a malfunctioning control module.

4. Can I drive my car with the P1F5B code?

Driving with this code is not recommended, as it can lead to electrical system failures or further damage to the vehicle's power supply components.

5. How can I diagnose the P1F5B code?

Diagnosis involves inspecting the 14-volt power module, checking the wiring and connectors for damage, and testing the circuit for proper voltage levels.

6. What repairs are needed to fix the P1F5B code?

Repairs could include replacing the 14-volt power module, repairing or replacing damaged wiring, or reprogramming the control module if necessary.

7. How much does it cost to repair the P1F5B code?

Repair costs vary depending on the specific issue but can range from $100 for minor wiring repairs to over $1,000 for module replacement and reprogramming.

8. Can a dead battery cause the P1F5B code?

A weak or dead battery is unlikely to cause this code directly but may contribute to electrical issues that affect the power module's operation.

9. How do I prevent the P1F5B code from occurring again?

Regular maintenance, inspecting the electrical system for damage, and ensuring the battery and alternator are in good condition can help prevent this code.

10. Does the P1F5B code only apply to hybrid or electric vehicles?

No, this code can appear in various types of vehicles equipped with a 14-volt power module, regardless of whether they are hybrid, electric, or traditional internal combustion engine vehicles.