AutoCodes – Generic – P1A75

P1A75 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 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 1,003

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

What does this mean?

What are the Possible Causes of the DTC P1A75?

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?

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 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.

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Need Help with the Code?

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Information for Specific Makes

P1A75 Buick — Starter/Generator Control Module Coolant Temperature Sensor 2 Performance
P1A75 Cadillac — Starter/Generator Control Module Coolant Temperature Sensor 2 Performance
P1A75 Chevrolet — Starter/Generator Control Module Coolant Temperature Sensor 2 Performance
P1A75 GMC — Starter/Generator Control Module Coolant Temperature Sensor 2 Performance
P1A75 Saturn — Starter/Generator Control Module Coolant Temperature Sensor 2 Performance

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 Code

1. What does the OBDII code P1A75 mean?

P1A75 indicates an issue with the performance of the Starter/Generator Control Module Coolant Temperature Sensor 2, which monitors coolant temperature to ensure proper operation of the starter/generator system.

2. What are the common symptoms of a P1A75 code?

Symptoms may include reduced hybrid or electric vehicle performance, poor fuel efficiency, an illuminated check engine light, or the vehicle entering a limp mode.

3. What causes the P1A75 code to appear?

Possible causes include a faulty coolant temperature sensor, wiring issues such as shorts or open circuits, a malfunctioning starter/generator control module, or low coolant levels.

4. How can I diagnose the P1A75 code?

Use an OBDII scanner to confirm the code and inspect the coolant temperature sensor, wiring, and connector for damage or corrosion. Check the coolant level and ensure there are no leaks.

5. Can I drive with the P1A75 code?

Driving with this code is possible but not recommended, as it may lead to reduced system performance and potential overheating of the starter/generator components.

6. How do I fix the P1A75 code?

Repairs may include replacing the faulty coolant temperature sensor, repairing or replacing damaged wiring, refilling coolant, or addressing issues with the starter/generator control module.

7. How much does it cost to fix a P1A75 code?

The cost can vary depending on the root cause, with sensor replacement typically ranging from $100 to $300, while module repairs may cost significantly more.

8. Can low coolant cause the P1A75 code?

Yes, low coolant levels can cause incorrect readings from the coolant temperature sensor, triggering the P1A75 code.

9. How can I prevent the P1A75 code from recurring?

Regularly check coolant levels, inspect for leaks, and ensure the coolant temperature sensor and related wiring are in good condition.

10. Do I need a professional mechanic to fix the P1A75 code?

While some repairs like adding coolant or inspecting wiring can be done by a skilled DIYer, diagnosing and fixing sensor or module issues may require a professional mechanic.