AutoCodes – GMC – P1A9E GMC

P1A9E GMC Code - Starter/Generator Inverter Phase U Overtemperature

Quick Answer

The Power Inverter Module (PIM) temperature 1 and 2 sensors are used for overheat protection. 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: P1A9E GMC indicates Starter/Generator Inverter Phase U Overtemperature.
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 873

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 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A9E GMC Description

The Power Inverter Module (PIM) temperature 1 and 2 sensors are used for overheat protection. The thermistors are located on the control board, near the phase U or V power MOSFET. The Starter/Generator Control Module (SGCM) monitors the inverter temperature sensor for the following:
To detect if the inverter phase U or V temperature sensor is shorted low.
To detect if the inverter phase U or V temperature sensor is shorted high.

OBDII Code P1A9E GMC - Starter/Generator Inverter Phase U Overtemperature - AutoCodes.com — P1A9E GMC Code - Starter/Generator Inverter Phase U Overtemperature

What does this mean?

What are the Possible Causes of the DTC P1A9E 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 P1A9E 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 P1A9E 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 P1A9E GMC code?

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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 P1A9E GMC Code

1. What are the common symptoms of OBDII code P1A9E GMC (Starter/Generator Inverter Phase U Overtemperature)?

- Common symptoms include illuminated check engine light, reduced power or performance, and possible overheating of the starter/generator inverter.

2. What are the possible causes of OBDII code P1A9E GMC?

- The code P1A9E could be caused by a malfunctioning temperature sensor, cooling system issues, a faulty inverter, or electrical problems.

3. How can I diagnose OBDII code P1A9E GMC?

- Diagnosing this code may involve using an OBDII scanner to retrieve the code, checking the temperature sensor readings, inspecting the cooling system, and testing the inverter for proper operation.

4. Can I still drive my vehicle with OBDII code P1A9E GMC?

- It is not recommended to drive your vehicle with this code present, as it can lead to further damage to the starter/generator inverter and potentially cause a breakdown.

5. How can I repair OBDII code P1A9E GMC?

- Repairing this code may involve replacing the temperature sensor, addressing cooling system issues, repairing or replacing the inverter, and clearing the code with an OBDII scanner.

6. Are there any preventive maintenance tips to avoid OBDII code P1A9E GMC?

- Regularly inspecting and maintaining the cooling system, checking the inverter for any signs of wear or damage, and addressing any electrical issues promptly can help prevent this code from occurring.

7. Can a DIY enthusiast fix OBDII code P1A9E GMC at home?

- Depending on your level of experience and access to tools, some aspects of diagnosing and repairing this code may be feasible for a DIY enthusiast, but it is recommended to consult a professional for accurate diagnosis and repair.

8. How urgent is it to address OBDII code P1A9E GMC?

- It is important to address this code promptly to prevent potential damage to the starter/generator inverter and ensure the overall health and performance of your vehicle.

9. Will resetting the OBDII code P1A9E GMC make it go away permanently?

- Simply resetting the code without addressing the underlying issue will not make it go away permanently. It is crucial to diagnose and repair the root cause of the code for a lasting solution.

10. Is OBDII code P1A9E GMC a common issue in GMC vehicles?

- While not extremely common, OBDII code P1A9E GMC related to Starter/Generator Inverter Phase U Overtemperature can occur in GMC vehicles equipped with this system, particularly in hybrid or electric models.