AutoCodes – GMC – P1EFA GMC

P1EFA GMC Code - Battery Charger High-Voltage Converter 1 Input Current Too High

Quick Answer

The hybrid/EV powertrain control module 2 monitors the battery charger high-voltage output and current output and ensures they are within the proper range. 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: P1EFA GMC indicates Battery Charger High-Voltage Converter 1 Input Current Too High.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 868

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1EFA GMC Description

The hybrid/EV powertrain control module 2 monitors the battery charger high-voltage output and current output and ensures they are within the proper range. The battery charger operates in either a constant current mode or a constant voltage mode. Whichever mode you are in will determine which diagnostic will be run. The battery charger runs constant voltage mode at the beginning and end of the charge cycle and runs constant current mode most of the charging cycle.

OBDII Code P1EFA GMC - Battery Charger High-Voltage Converter 1 Input Current Too High - AutoCodes.com — P1EFA GMC Code - Battery Charger High-Voltage Converter 1 Input Current Too High

What does this mean?

What are the Possible Causes of the DTC P1EFA GMC?

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

How to Fix the DTC P1EFA GMC?

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 P1EFA GMC 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 P1EFA GMC code?

Need more information on how to fix the P1EFA GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1EFA GMC code diagnosed by a professional: Find a repair shop in your area

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 P1EFA GMC Code

1. What are the common symptoms of OBDII code P1EFA in a GMC vehicle?

- Common symptoms include poor fuel efficiency, loss of power, illuminated check engine light, and potential drivability issues.

2. What could cause the OBDII code P1EFA in a GMC to trigger?

- The code may trigger due to a faulty high-voltage converter, issues with the battery charger system, or a malfunction in the input current sensor.

3. How can I diagnose the Battery Charger High-Voltage Converter 1 Input Current Too High error in my GMC?

- Diagnosis typically involves using a diagnostic scan tool to retrieve the specific trouble codes, inspecting the high-voltage converter and related components, and testing the input current sensor.

4. Is it safe to continue driving my GMC with the P1EFA code present?

- It is not recommended to drive the vehicle with this code present, as it could lead to further damage to the electrical system or components.

5. What are some possible repair tips for fixing the Battery Charger High-Voltage Converter 1 Input Current Too High issue?

- Repair tips may include checking and replacing damaged wiring, repairing or replacing the high-voltage converter, and ensuring proper connections in the charging system.

6. Can a DIY enthusiast fix the P1EFA code in a GMC, or is professional help necessary?

- While some simple checks like inspecting wiring connections can be done by a DIY enthusiast, diagnosing and repairing more complex issues related to the high-voltage converter may require professional help.

7. How much does it typically cost to repair the Battery Charger High-Voltage Converter 1 Input Current Too High problem in a GMC?

- The cost of repair can vary depending on the extent of the issue, parts needed, and labor rates, but it may range from a few hundred to over a thousand dollars.

8. Are there any preventive maintenance steps I can take to avoid the P1EFA code in my GMC?

- Regularly inspecting the high-voltage components, keeping the electrical system well-maintained, and addressing any warning signs promptly can help prevent the occurrence of this code.

9. Can a weak or failing battery cause the P1EFA code to appear in a GMC?

- Yes, a weak or failing battery can sometimes contribute to the triggering of the P1EFA code, as it may affect the proper functioning of the high-voltage converter and charging system.

10. Will resetting the OBDII code P1EFA in my GMC make it go away permanently?

- Resetting the code may temporarily make the warning light disappear, but if the underlying issue is not addressed and fixed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.