AutoCodes – GMC – P1A7E GMC

P1A7E GMC Code - Starter/Generator Control Module Overtemperature High Voltage System Disabled

Quick Answer

The Starter/Generator Control Module (SGCM) monitors its internal fluid temperature sensors to control the SGCM coolant pump and SGCM cooling fan. Common causes include Faulty Starter/Generator Control Module (SGCM), Starter/Generator Control Module (SGCM) harness is open or shorted, Starter/Generator Control Module (SGCM) 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: P1A7E GMC indicates Starter/Generator Control Module Overtemperature High Voltage System Disabled.
Common causes: Common causes include Faulty Starter/Generator Control Module (SGCM), Starter/Generator Control Module (SGCM) harness is open or shorted, Starter/Generator Control Module (SGCM) 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 779

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 Feb 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A7E GMC Description

The Starter/Generator Control Module (SGCM) monitors its internal fluid temperature sensors to control the SGCM coolant pump and SGCM cooling fan. The internal fluid temperature sensors of the SGCM are thermistors and are not serviceable. When the internal fluid temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the internal fluid temperatures are hot, the resistances of the sensors are low and the voltage signals are low. The input parameters are not displayed on the scan tool. The SGCM calculates the estimated temperature of the electronics to interpret the total temperature of the SGCM. This value is displayed on the scan tool.

OBDII Code P1A7E GMC - Starter/Generator Control Module Overtemperature High Voltage System Disabled - AutoCodes.com — P1A7E GMC Code - Starter/Generator Control Module Overtemperature High Voltage System Disabled

What does this mean?

What are the Possible Causes of the DTC P1A7E GMC?

Faulty Starter/Generator Control Module (SGCM)
Starter/Generator Control Module (SGCM) harness is open or shorted
Starter/Generator Control Module (SGCM) circuit poor electrical connection

How to Fix the DTC P1A7E 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 P1A7E 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.

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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 P1A7E GMC Code

1. What are common symptoms of OBDII code P1A7E GMC?

- Common symptoms include the vehicle not starting, reduced power mode activation, and a warning message indicating "Starter/Generator Control Module Overtemperature High Voltage System Disabled."

2. What can cause OBDII code P1A7E GMC to trigger?

- This code is typically triggered by overheating of the starter/generator control module, leading to the high voltage system being disabled for safety reasons.

3. How serious is OBDII code P1A7E GMC?

- This code should be taken seriously as it indicates a potential issue with the high voltage system of the vehicle, which can impact the overall functionality and safety of the hybrid or electric vehicle.

4. Can I continue driving with OBDII code P1A7E GMC present?

- It is not recommended to continue driving with this code present, as the high voltage system being disabled can lead to further damage or safety hazards.

5. How can OBDII code P1A7E GMC be repaired?

- Repairing this code typically involves diagnosing the root cause of the overheating issue in the starter/generator control module and addressing any related components or wiring problems.

6. What are some DIY tips for troubleshooting OBDII code P1A7E GMC?

- DIY troubleshooting tips may include visually inspecting the starter/generator control module for signs of overheating, checking related fuses and wiring connections, and ensuring proper cooling system functioning.

7. Is it safe to reset the OBDII code P1A7E GMC without addressing the underlying issue?

- It is not recommended to simply reset the code without diagnosing and repairing the underlying cause, as the problem can persist and potentially lead to more serious issues.

8. How can a professional mechanic help with OBDII code P1A7E GMC?

- A professional mechanic can use specialized diagnostic tools to pinpoint the exact cause of the code, perform thorough inspections, and make the necessary repairs to ensure the vehicle is safe and functional.

9. Are there any recalls or technical service bulletins related to OBDII code P1A7E GMC?

- It is advisable to check with the manufacturer or authorized dealerships for any recalls or technical service bulletins related to this specific OBDII code, as there may be known issues and solutions available.

10. How can I prevent OBDII code P1A7E GMC from recurring in the future?

- To prevent this code from recurring, regular maintenance of the high voltage system, cooling system, and related components is essential. Additionally, addressing any signs of overheating promptly can help avoid triggering the code again.