AutoCodes – GMC – P1AA1 GMC

P1AA1 GMC Code - Starter/Generator Inverter Phase V Temperature Sensor Circuit High Voltage

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: P1AA1 GMC indicates Starter/Generator Inverter Phase V Temperature Sensor Circuit High Voltage.
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 1,161

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 P1AA1 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 P1AA1 GMC - Starter/Generator Inverter Phase V Temperature Sensor Circuit High Voltage - AutoCodes.com — P1AA1 GMC Code - Starter/Generator Inverter Phase V Temperature Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1AA1 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 P1AA1 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 P1AA1 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 P1AA1 GMC 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 P1AA1 GMC Code

1. What are the common symptoms of OBDII code P1AA1 in a GMC vehicle?

- Common symptoms include the check engine light coming on, reduced engine power, and potential drivability issues.

2. What does the OBDII code P1AA1 indicate in a GMC vehicle?

- This code specifically refers to a high voltage condition detected in the Starter/Generator Inverter Phase V Temperature Sensor Circuit.

3. What are some possible causes of OBDII code P1AA1 in a GMC vehicle?

- Possible causes may include a faulty temperature sensor, wiring issues in the circuit, a malfunctioning inverter, or problems with the starter/generator assembly.

4. How can I diagnose the OBDII code P1AA1 in my GMC vehicle?

- Diagnosing this code typically involves using a scan tool to read the code, checking the temperature sensor and its circuit for faults, and inspecting the inverter and starter/generator components.

5. Can I continue driving my GMC vehicle with OBDII code P1AA1 present?

- It is not recommended to continue driving with this code active, as it can lead to further damage to the electrical components and potentially affect vehicle performance.

6. Is it safe to clear the OBDII code P1AA1 and see if it returns in my GMC vehicle?

- While you can clear the code to see if it returns, it is important to address the underlying issue causing the fault to prevent potential safety hazards or damage to the vehicle.

7. How much does it typically cost to repair OBDII code P1AA1 in a GMC vehicle?

- Repair costs can vary depending on the exact cause of the code, but they may range from a few hundred to over a thousand dollars, especially if components need to be replaced.

8. Can I attempt to repair OBDII code P1AA1 in my GMC vehicle myself?

- Repairing this code may require advanced diagnostic tools and knowledge of electrical systems, so it is recommended to consult a professional mechanic or dealership for proper diagnosis and repair.

9. Are there any preventive maintenance measures I can take to avoid OBDII code P1AA1 in my GMC vehicle?

- Regularly inspecting and maintaining the electrical components in the starter/generator system, as well as ensuring proper wiring connections, can help prevent issues leading to this fault code.

10. How urgent is it to address OBDII code P1AA1 in my GMC vehicle?

- While the severity may vary, it is generally advisable to address this code promptly to prevent potential damage to critical electrical components and ensure the vehicle operates safely.