AutoCodes – Honda – P1F20 Honda

P1F20 Honda Code - Generator Motor Inverter Power Supply Voltage Low

Quick Answer

The Voltage Control Unit (VCU) monitors decrease in the supplied 12 volt power supply voltage at all times and sends the judgment result to the motor control module (generator) via serial communication. Common causes include Faulty Voltage Control Unit (VCU), Voltage Control Unit (VCU) harness is open or shorted, Voltage Control Unit (VCU) 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: P1F20 Honda indicates Generator Motor Inverter Power Supply Voltage Low.
Common causes: Common causes include Faulty Voltage Control Unit (VCU), Voltage Control Unit (VCU) harness is open or shorted, Voltage Control Unit (VCU) 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 1,281

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 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1F20 Honda Description

The Voltage Control Unit (VCU) monitors decrease in the supplied 12 volt power supply voltage at all times and sends the judgment result to the motor control module (generator) via serial communication. The motor control module (generator) detects a malfunction and stores a DTC when the 12 volt power supply voltage decrease judgment result is received from the VCU continuously for the prescribed time or more.

OBDII Code P1F20 Honda - Generator Motor Inverter Power Supply Voltage Low - AutoCodes.com — P1F20 Honda Code - Generator Motor Inverter Power Supply Voltage Low

What does this mean?

What are the Possible Causes of the DTC P1F20 Honda?

Faulty Voltage Control Unit (VCU)
Voltage Control Unit (VCU) harness is open or shorted
Voltage Control Unit (VCU) circuit poor electrical connection
Faulty Motor Control Module (Generator)

How to Fix the DTC P1F20 Honda?

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 P1F20 Honda 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 P1F20 Honda code?

Need more information on how to fix the P1F20 Honda code? Get Access to Factory Service Manuals

Need Help with the 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 P1F20 Honda Code

What does the OBDII code P1F20 mean for Honda vehicles?

The OBDII code P1F20 indicates that the generator motor inverter power supply voltage is low, which can affect the performance of the vehicle's hybrid system.

What are common symptoms of the P1F20 code?

Common symptoms may include reduced power output, warning lights on the dashboard, and potential issues with the hybrid system's operation.

What could cause the P1F20 code to trigger?

The code can be triggered by issues such as a failing generator motor inverter, low voltage from the battery, damaged wiring, or poor connections in the electrical system.

How can I diagnose the P1F20 code?

To diagnose the P1F20 code, use an OBDII scanner to confirm the code, inspect the battery and inverter connections, and test the voltage output from the generator motor inverter.

What repair steps should I take if I encounter the P1F20 code?

Repair steps may include checking and securing electrical connections, testing the battery voltage and inverter performance, and replacing any faulty components, such as the generator motor inverter.

Can I drive my Honda vehicle with a P1F20 code?

While it may be possible to drive the vehicle, it is not recommended as it can lead to further damage to the hybrid system or reduced performance.

How important is it to fix the P1F20 code?

It is important to address the P1F20 code promptly to ensure the proper functioning of the hybrid system and to prevent more serious issues in the future.

Is the P1F20 code specific to Honda vehicles?

Yes, while the P1F20 code can appear in other vehicles, it is commonly associated with Honda hybrid models and their specific hybrid system components.

What is the typical cost to repair the issue related to the P1F20 code?

Repair costs can vary widely based on the underlying issue, but repairs may range from a few hundred to several thousand dollars depending on whether components need to be repaired or replaced.