AutoCodes – Buick – P1F59 Buick

P1F59 Buick Code - 14 Volt Power Module Status Terminal Circuit Performance

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: P1F59 Buick indicates 14 Volt Power Module Status Terminal Circuit Performance.
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 860

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 P1F59 Buick 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 P1F59 Buick - 14 Volt Power Module Status Terminal Circuit Performance - AutoCodes.com — P1F59 Buick Code - 14 Volt Power Module Status Terminal Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1F59 Buick?

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 P1F59 Buick?

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 P1F59 Buick 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 P1F59 Buick 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 P1F59 Buick Code

1. What does the OBDII code P1F59 mean for a Buick?

Code P1F59 indicates an issue with the 14 Volt Power Module Status Terminal Circuit Performance, meaning the vehicleâ€™s control module is detecting irregularities in the power module circuit.

2. What are the common symptoms of code P1F59 in a Buick?

Symptoms may include the vehicle not charging properly, warning lights on the dashboard (such as the battery or check engine light), reduced fuel efficiency, or possible electrical malfunctions.

3. What causes code P1F59 to appear in a Buick?

Common causes include a faulty 14 Volt Power Module, wiring or connector issues, a malfunctioning battery, or a problem with the vehicleâ€™s control module.

4. Can I drive my Buick with the P1F59 code?

Driving with this code is not recommended, as it can lead to battery depletion, electrical failures, or further damage to the charging system.

5. How is the P1F59 code diagnosed?

A technician will use a scan tool to retrieve the code, inspect the wiring and connectors for damage, test the 14 Volt Power Module, and check the battery and alternator for proper operation.

6. What repairs are needed to fix code P1F59 in a Buick?

Repairs may include replacing the 14 Volt Power Module, repairing or replacing damaged wiring or connectors, or reprogramming/updating the vehicleâ€™s control module.

7. How much does it cost to repair a Buick with a P1F59 code?

The repair cost varies depending on the root cause, but it can range from $150 to $800 or more, depending on labor rates and parts needed.

8. Can a dead battery trigger code P1F59 on a Buick?

Yes, a weak or dead battery can cause irregularities in the 14 Volt Power Module circuit and trigger the P1F59 code.

9. Is the P1F59 code common in Buick vehicles?

While not extremely common, this code can occur in certain Buick models with advanced electrical systems, especially if there are issues with the charging system.

10. Does the P1F59 code require a software update to fix?

In some cases, a software update or reprogramming of the control module may be necessary if the issue stems from a software glitch affecting the 14 Volt Power Module.