AutoCodes – Generic – P1A7A

P1A7A Code - Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit High Voltage

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: P1A7A indicates Starter/Generator Control Module Coolant Temperature Sensor 3 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 1,249

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 P1A7A 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.

OBDII Code P1A7A - Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit High Voltage - AutoCodes.com — P1A7A Code - Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1A7A?

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 P1A7A?

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 P1A7A 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 P1A7A code?

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Information for Specific Makes

P1A7A Buick — Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit High Voltage
P1A7A Cadillac — Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit High Voltage
P1A7A Chevrolet — Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit High Voltage
P1A7A GMC — Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit High Voltage
P1A7A Saturn — Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit High Voltage

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 P1A7A Code

1. What are the common symptoms of OBDII code P1A7A?

- Common symptoms include the Check Engine light illuminating on the dashboard, poor fuel efficiency, and potential issues with engine performance.

2. What does the OBDII code P1A7A indicate?

- The code P1A7A indicates a high voltage issue in the coolant temperature sensor 3 circuit of the Starter/Generator Control Module.

3. What are the possible causes of OBDII code P1A7A?

- Possible causes include a malfunctioning coolant temperature sensor, wiring issues, a faulty control module, or a problem with the electrical system.

4. How can I diagnose the OBDII code P1A7A?

- Diagnosing the code typically involves using a diagnostic scanner to read the code, checking the coolant temperature sensor and its wiring for any issues, and testing the control module.

5. Can I still drive my vehicle with the OBDII code P1A7A present?

- It is not recommended to drive your vehicle with this code present, as it can lead to further damage and potential safety hazards. It is best to address the issue promptly.

6. How can I repair OBDII code P1A7A?

- Repairing the code may involve replacing the coolant temperature sensor, repairing any damaged wiring, replacing the control module if necessary, and clearing the code with a diagnostic tool.

7. Is it safe to reset the OBDII code P1A7A without fixing the underlying issue?

- It is not recommended to simply reset the code without addressing the underlying problem, as it may result in the issue persisting and potentially causing further damage to the vehicle.

8. Are there any specific repair tips for OBDII code P1A7A?

- It is advisable to carefully inspect the coolant temperature sensor and its connections, ensure proper wiring connections, and follow manufacturer guidelines for component replacement.

9. How common is the OBDII code P1A7A in vehicles?

- The code P1A7A is relatively uncommon compared to other OBDII codes, but it can still occur in vehicles equipped with the relevant systems.

10. Can a DIY enthusiast fix OBDII code P1A7A, or is professional assistance recommended?

- Depending on your skill level and experience with automotive repairs, you may be able to address the issue yourself by following repair guides and using the necessary tools. However, professional assistance is recommended if you are unsure or unfamiliar with the repair process.