AutoCodes – Generic – P1EFD

P1EFD Code - Battery Charger Power Efficiency

Quick Answer

The battery charger will diagnose its own systems and determine when a fault condition is present. Common causes include Faulty Battery Charger, Battery Charger harness is open or shorted, Battery Charger 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: P1EFD indicates Battery Charger Power Efficiency.
Common causes: Common causes include Faulty Battery Charger, Battery Charger harness is open or shorted, Battery Charger 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 851

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 P1EFD Description

The battery charger will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the battery charger to the hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for DTC information.

OBDII Code P1EFD - Battery Charger Power Efficiency - AutoCodes.com — P1EFD Code - Battery Charger Power Efficiency

What does this mean?

What are the Possible Causes of the DTC P1EFD?

Faulty Battery Charger
Battery Charger harness is open or shorted
Battery Charger circuit poor electrical connection

How to Fix the DTC P1EFD?

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 P1EFD 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 P1EFD code?

Need more information on how to fix the P1EFD code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1EFD code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1EFD Buick — Battery Charger Power Efficiency
P1EFD Cadillac — Battery Charger Power Efficiency
P1EFD Chevrolet — Battery Charger Power Efficiency
P1EFD GMC — Battery Charger Power Efficiency
P1EFD Saturn — Battery Charger Power Efficiency

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 P1EFD Code

1. What are the common symptoms of OBDII code P1EFD (Battery Charger Power Efficiency)?

- Common symptoms include slow charging, incomplete charging cycles, and potential battery draining issues.

2. What are the possible causes of OBDII code P1EFD?

- Possible causes include a faulty battery charger, issues with the charging cable, poor electrical connections, or a damaged battery.

3. How can I diagnose the OBDII code P1EFD?

- You can diagnose this code by checking the battery charger operation, inspecting the charging cable for damage, testing the battery health, and verifying electrical connections.

4. What are some repair tips for addressing code P1EFD?

- Repair tips may include replacing the battery charger, repairing or replacing the charging cable, ensuring proper electrical connections, and replacing the battery if necessary.

5. Can a low-quality or incompatible battery charger trigger code P1EFD?

- Yes, using a low-quality or incompatible battery charger can lead to efficiency issues and trigger code P1EFD.

6. How important is it to address OBDII code P1EFD promptly?

- It is important to address this code promptly to ensure proper charging of the vehicle's battery and avoid potential issues with battery performance and longevity.

7. Are there any safety precautions to consider when dealing with OBDII code P1EFD?

- Safety precautions may include following manufacturer guidelines for using battery chargers, avoiding contact with exposed electrical components, and ensuring proper ventilation during charging.

8. Can weather conditions affect the triggering of code P1EFD?

- Extreme weather conditions, such as very high or low temperatures, can impact the efficiency of battery chargers and potentially trigger code P1EFD.

9. Is it possible for a software glitch in the vehicle's system to cause code P1EFD?

- Yes, a software glitch in the vehicle's system related to battery charging management can also potentially trigger code P1EFD.

10. How can regular maintenance help prevent OBDII code P1EFD from occurring?

- Regular maintenance, such as inspecting and cleaning electrical connections, checking the battery charger for any issues, and ensuring proper storage of the charger, can help prevent code P1EFD.