AutoCodes – Buick – P1A7A Buick

P1A7A Buick 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 Buick 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 812

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

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 Buick?

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 Buick 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 Buick 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 P1A7A Buick Code

1. What does the OBDII code P1A7A mean on a Buick?

The P1A7A code indicates a high voltage issue in the Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit, which monitors the temperature of the coolant in the hybrid or electric system.

2. What are the common symptoms of the P1A7A code?

Symptoms may include an illuminated check engine light, reduced hybrid or electric system performance, overheating warnings, or a failure to engage the starter/generator system.

3. What causes the P1A7A code to appear on a Buick?

Common causes include a faulty coolant temperature sensor, damaged wiring or connectors in the sensor circuit, or issues with the Starter/Generator Control Module itself.

4. Can I drive my Buick with the P1A7A code active?

While the vehicle may still be drivable, it is not recommended as this issue could lead to overheating or reduced hybrid system performance, potentially causing further damage.

5. How do I diagnose the P1A7A code on my Buick?

Diagnosis typically involves checking the coolant temperature sensor for proper function, inspecting the wiring and connectors for damage or corrosion, and testing the Starter/Generator Control Module.

6. What repairs are needed to fix the P1A7A code?

Repairs may include replacing the coolant temperature sensor, repairing damaged wiring or connectors, or replacing the Starter/Generator Control Module if itâ€™s found to be faulty.

7. How much does it cost to fix the P1A7A code on a Buick?

Repair costs vary but could range from $100 to $500 depending on whether the issue is with the sensor, wiring, or module, plus labor costs.

8. Can a faulty coolant temperature sensor cause the P1A7A code?

Yes, a malfunctioning coolant temperature sensor is a common cause of this code as it provides inaccurate readings to the control module.

9. Will clearing the code with a scanner fix the P1A7A issue?

Clearing the code will not fix the underlying issue. The root cause must be identified and repaired to prevent the code from returning.

10. How can I prevent the P1A7A code from occurring again?

Regular maintenance, ensuring the cooling system is in good condition, and promptly addressing any wiring or sensor issues can help prevent this code from recurring.