AutoCodes – Generic – P1EFC

P1EFC Code - Battery Charger Control Module System Voltage Low Voltage

Quick Answer

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. Common causes include Faulty Battery Charger Control Module, Battery Charger Control Module harness is open or shorted, Battery Charger Control 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: P1EFC indicates Battery Charger Control Module System Voltage Low Voltage.
Common causes: Common causes include Faulty Battery Charger Control Module, Battery Charger Control Module harness is open or shorted, Battery Charger Control 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 2,217

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 P1EFC Description

The vehicle control modules or sensors monitor the system voltage to verify the system voltage is within the normal operating range. The Powertrain Control Module (PCM) sets the OBDII code when the Battery Charger Control Module is not to factory specifications.

OBDII Code P1EFC - Battery Charger Control Module System Voltage Low Voltage - AutoCodes.com — P1EFC Code - Battery Charger Control Module System Voltage Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1EFC?

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

How to Fix the DTC P1EFC?

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 P1EFC 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 P1EFC code?

Need more information on how to fix the P1EFC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1EFC code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1EFC Buick — Battery Charger Control Module System Voltage Low Voltage
P1EFC Cadillac — Battery Charger Control Module System Voltage Low Voltage
P1EFC Chevrolet — Battery Charger Control Module System Voltage Low Voltage
P1EFC GMC — Battery Charger Control Module System Voltage Low Voltage
P1EFC Saturn — Battery Charger Control Module System Voltage Low 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 P1EFC Code

1. What are the common symptoms of OBDII code P1EFC?

- Common symptoms of code P1EFC include difficulty starting the vehicle, dimming lights, erratic behavior of electronic components, and the check engine light illuminating.

2. What are the possible causes of OBDII code P1EFC?

- The possible causes of code P1EFC include a faulty battery charger control module, low battery voltage, wiring issues, or problems with the charging system.

3. How can I diagnose OBDII code P1EFC?

- Diagnosing code P1EFC involves using a diagnostic scanner to retrieve the code, checking the battery voltage, inspecting the battery charger control module, and testing the charging system components.

4. Can a low battery voltage trigger OBDII code P1EFC?

- Yes, low battery voltage can trigger code P1EFC as it may indicate a problem with the charging system or the battery charger control module.

5. What are some repair tips for OBDII code P1EFC?

- Repair tips for code P1EFC include checking and replacing the battery if necessary, inspecting and repairing any damaged wiring, testing and replacing the battery charger control module, and ensuring proper charging system operation.

6. Is it safe to continue driving with OBDII code P1EFC present?

- It is not recommended to continue driving with code P1EFC present, as it can lead to issues with starting the vehicle and potential damage to electronic components due to low voltage.

7. How urgent is it to address OBDII code P1EFC?

- It is important to address code P1EFC promptly to prevent further electrical system issues and ensure the vehicle remains safe and reliable to drive.

8. Can a DIY enthusiast repair OBDII code P1EFC?

- DIY enthusiasts with automotive repair experience may be able to address code P1EFC by following diagnostic procedures, checking components, and making necessary repairs or replacements.

9. How much does it typically cost to repair OBDII code P1EFC?

- The cost to repair code P1EFC can vary depending on the underlying cause, but expenses may include parts such as a battery charger control module, battery, or wiring harness, as well as labor costs if professional help is needed.

10. Can a faulty battery charger control module cause OBDII code P1EFC?

- Yes, a faulty battery charger control module can cause code P1EFC by failing to regulate the system voltage properly, leading to low voltage issues in the vehicle's electrical system.