AutoCodes – GMC – P1EF7 GMC

P1EF7 GMC 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 GMC 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 1,218

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 GMC 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 GMC - Battery Charger Control Module Ignition On/Start Switch Circuit High Voltage - AutoCodes.com — P1EF7 GMC 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 GMC?

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 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 P1EF7 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 P1EF7 GMC code?

Need more information on how to fix the P1EF7 GMC 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 P1EF7 GMC Code

What does the OBDII code P1EF7 mean for my GMC?

The code P1EF7 indicates a problem with the Battery Charger Control Module, specifically relating to high voltage in the ignition on/start switch circuit.

What are the common symptoms of a P1EF7 code?

Common symptoms include warning lights on the dashboard, issues with starting the vehicle, and reduced battery charging efficiency.

What could cause the P1EF7 code to trigger?

Possible causes include a faulty Battery Charger Control Module, damaged wiring or connectors, or issues with the ignition switch or battery.

How can I diagnose the P1EF7 code?

You can start by using an OBDII scanner to confirm the code, then inspect the wiring and connectors for damage, and test the Battery Charger Control Module for proper function.

What repairs are typically needed for the P1EF7 code?

Repairs may involve replacing the Battery Charger Control Module, fixing any damaged wiring or connectors, and ensuring the ignition switch is functioning correctly.

Can I drive my GMC with the P1EF7 code?

While it might be possible to drive with this code, it is not recommended due to potential battery charging issues that could lead to vehicle breakdown.

Is the P1EF7 code serious?

Yes, the P1EF7 code can indicate a serious issue with the battery charging system, which could affect the vehicle's performance and reliability.

How much does it typically cost to fix a P1EF7 code?

Repair costs can vary widely based on the root cause, but replacing the Battery Charger Control Module can range from $200 to $600 or more, depending on labor and parts.

Can I reset the P1EF7 code after repairs?

Yes, once the necessary repairs have been made, you can reset the code using an OBDII scanner, but it's important to ensure the issue is resolved to prevent the code from returning.