AutoCodes – Chevrolet – P1EF7 Chevrolet

P1EF7 Chevrolet Code - Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage

Quick Answer

The Body Control Module (BCM) controls the ignition run relay through the control circuit by applying voltage to the circuit. Common causes include Faulty Hybrid Powertrain Control Module 2, Hybrid Powertrain Control Module 2 harness is open or shorted, Hybrid Powertrain Control Module 2 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: P1EF7 Chevrolet indicates Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage.
Common causes: Common causes include Faulty Hybrid Powertrain Control Module 2, Hybrid Powertrain Control Module 2 harness is open or shorted, Hybrid Powertrain Control Module 2 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 1,141

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 P1EF7 Chevrolet Description

The Body Control Module (BCM) controls the ignition run relay through the control circuit by applying voltage to the circuit. The ignition circuit is energized when the vehicle power mode is Vehicle ON or Vehicle in Service Mode. The hybrid powertrain control module 2 sends the vehicle power mode status in a serial data message to the battery charger control module, A/C compressor, battery energy control module, fuel pump control module and the Transmission Control Module (TCM).

OBDII Code P1EF7 Chevrolet - Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage - AutoCodes.com — P1EF7 Chevrolet Code - Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1EF7 Chevrolet?

Faulty Hybrid Powertrain Control Module 2
Hybrid Powertrain Control Module 2 harness is open or shorted
Hybrid Powertrain Control Module 2 circuit poor electrical connection

How to Fix the DTC P1EF7 Chevrolet?

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 P1EF7 Chevrolet 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 P1EF7 Chevrolet code?

Need more information on how to fix the P1EF7 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1EF7 Chevrolet 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 P1EF7 Chevrolet Code

1. What are the common symptoms of OBDII code P1EF7 in a Chevrolet related to the Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage issue?

The common symptoms include difficulty starting the vehicle, intermittent or no power to the battery charger, and potential illumination of the Check Engine Light.

2. What could be potential causes of OBDII code P1EF7 in a Chevrolet indicating a high voltage issue with the Battery Charger Control Module Ignition On/Start Switch Circuit?

Possible causes may include a faulty ignition switch, a malfunctioning battery charger control module, damaged wiring or connectors in the circuit, or a problem with the vehicle's battery.

3. How can I diagnose the OBDII code P1EF7 in a Chevrolet related to the high voltage issue with the Battery Charger Control Module Ignition On/Start Switch Circuit?

A diagnostic scan tool can be used to retrieve the specific fault codes and further investigate the circuit for any visible damage or loose connections. Additionally, testing the ignition switch and the battery charger control module can help pinpoint the issue.

4. Are there any quick repair tips for addressing OBDII code P1EF7 in a Chevrolet due to the Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage problem?

Ensure all connections in the circuit are secure and free of corrosion. Consider testing the ignition switch and the battery charger control module for proper functionality. If needed, consult a professional mechanic for further assistance.

5. Can driving with OBDII code P1EF7 in a Chevrolet, indicating a high voltage issue with the Battery Charger Control Module Ignition On/Start Switch Circuit, cause further damage to the vehicle?

Continuing to drive with this issue may prevent proper charging of the vehicle's battery and could lead to a dead battery or other electrical problems over time. It is recommended to address the underlying cause promptly.

6. Is it safe to reset the Check Engine Light after encountering OBDII code P1EF7 in a Chevrolet related to the Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage?

Resetting the Check Engine Light without addressing the root cause of the issue may temporarily turn off the light, but the problem will likely persist and may resurface. It is advisable to diagnose and fix the underlying problem first.

7. How crucial is it to address OBDII code P1EF7 in a Chevrolet indicating a high voltage issue with the Battery Charger Control Module Ignition On/Start Switch Circuit promptly?

Addressing this issue promptly is crucial to ensure proper charging of the battery and avoid potential electrical problems in the vehicle. Ignoring the problem could lead to more severe issues down the line.

8. Can extreme weather conditions impact the likelihood of encountering OBDII code P1EF7 in a Chevrolet related to the Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage?

Extreme weather conditions, such as extreme heat or cold, can sometimes exacerbate existing electrical issues in a vehicle, potentially leading to the triggering of fault codes like P1EF7. It is important to monitor the vehicle's performance in varying weather conditions.

9. Are there any recalls or technical service bulletins related to OBDII code P1EF7 in Chevrolet vehicles concerning the Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage issue?

It is advisable to check with the manufacturer or authorized dealerships for any recalls or technical service bulletins related to this specific OBDII code in Chevrolet vehicles. They may provide additional information or assistance for addressing the problem.

10. How can regular maintenance help prevent issues like OBDII code P1EF7 in a Chevrolet due to the Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage problem?

Regular maintenance, including checking the condition of the vehicle's battery, inspecting wiring and connectors for damage, and ensuring the proper functioning of components like the ignition switch, can help prevent electrical issues that may trigger fault codes like P1EF7.