AutoCodes – Buick – P1A75 Buick

P1A75 Buick Code - Starter/Generator Control Module Coolant Temperature Sensor 2 Performance

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: P1A75 Buick indicates Starter/Generator Control Module Coolant Temperature Sensor 2 Performance.
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 891

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 P1A75 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 P1A75 Buick - Starter/Generator Control Module Coolant Temperature Sensor 2 Performance - AutoCodes.com — P1A75 Buick Code - Starter/Generator Control Module Coolant Temperature Sensor 2 Performance

What does this mean?

What are the Possible Causes of the DTC P1A75 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 P1A75 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 P1A75 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 P1A75 Buick 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 P1A75 Buick Code

What does the OBD-II code P1A75 mean on a Buick?

The P1A75 code indicates an issue with the performance of the Starter/Generator Control Module Coolant Temperature Sensor 2, which monitors coolant temperature for the hybrid system or starter generator.

What are the common symptoms of code P1A75 in a Buick?

Symptoms may include the check engine light turning on, reduced hybrid or electrical system performance, engine overheating, or poor fuel efficiency.

What causes the P1A75 code to appear on a Buick?

Common causes include a faulty coolant temperature sensor, wiring issues such as damaged or corroded connectors, or a malfunction in the Starter/Generator Control Module.

Can I drive my Buick with the P1A75 code?

While the vehicle may still be drivable, ignoring the code can lead to reduced efficiency or damage to the hybrid or electrical system. It's best to address the issue promptly.

How can I diagnose the P1A75 trouble code?

Diagnosis typically involves scanning the vehicle with an OBD-II scanner, inspecting the temperature sensor and its wiring, and checking for any coolant leaks or overheating.

What are the repair options for code P1A75?

Repairs may include replacing the coolant temperature sensor, fixing damaged wiring or connectors, or in rare cases, replacing the Starter/Generator Control Module.

How much does it cost to fix a P1A75 code on a Buick?

The cost varies but typically ranges from $100 to $400, depending on whether the issue is with the sensor, wiring, or module. Labor rates and part prices may also affect the total.

Can a low coolant level cause the P1A75 code?

Yes, low coolant levels can cause temperature sensor performance issues, leading to the P1A75 code. Always check your coolant level before diagnosing further.

Does the P1A75 code only affect hybrid Buicks?

The code is more common in hybrid or mild-hybrid Buicks equipped with a Starter/Generator system but may also appear in non-hybrid models with similar components.

How do I prevent the P1A75 code from recurring?

Regular maintenance, checking coolant levels, inspecting wiring for damage, and addressing overheating issues promptly can help prevent this code from reappearing.