AutoCodes – Chevrolet – P1A79 Chevrolet

P1A79 Chevrolet Code - Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low 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: P1A79 Chevrolet indicates Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low 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 960

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 P1A79 Chevrolet 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 P1A79 Chevrolet - Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage - AutoCodes.com — P1A79 Chevrolet Code - Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1A79 Chevrolet?

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 P1A79 Chevrolet?

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 P1A79 Chevrolet 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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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 P1A79 Chevrolet Code

1. What are common symptoms of OBDII code P1A79 Chevrolet related to the Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage?

The common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine Light.

2. What are the possible causes of OBDII code P1A79 Chevrolet indicating an issue with the Coolant Temperature Sensor 3 Circuit?

Possible causes include a faulty coolant temperature sensor, wiring or connection issues, or a malfunctioning starter/generator control module.

3. How can I diagnose the cause of OBDII code P1A79 Chevrolet related to the Coolant Temperature Sensor 3 Circuit Low Voltage?

Diagnosis involves checking the wiring and connections associated with the coolant temperature sensor, testing the sensor itself, and assessing the starter/generator control module for any faults.

4. Can a faulty coolant temperature sensor cause other issues besides triggering OBDII code P1A79 Chevrolet?

Yes, a faulty coolant temperature sensor can also lead to issues such as inaccurate temperature readings, improper fuel mixture, and potential overheating of the engine.

5. What are some repair tips for addressing OBDII code P1A79 Chevrolet linked to the Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage?

Repair tips include checking and cleaning the sensor connections, replacing a faulty coolant temperature sensor, and ensuring proper functioning of the starter/generator control module.

6. Is it safe to continue driving with OBDII code P1A79 Chevrolet related to the Coolant Temperature Sensor 3 Circuit Low Voltage?

It is not recommended to continue driving with this code present, as it can lead to further engine issues and potentially cause damage if left unresolved.

7. How much does it typically cost to repair OBDII code P1A79 Chevrolet associated with the Coolant Temperature Sensor 3 Circuit issue?

The cost of repair can vary depending on the exact cause of the issue, but it may involve expenses for parts and labor, ranging from $100 to $300 or more.

8. Can I reset the Check Engine Light after addressing OBDII code P1A79 Chevrolet myself?

Yes, once the underlying issue triggering the code has been resolved, you can reset the Check Engine Light using an OBDII scanner or by disconnecting the car's battery for a few minutes.

9. Are there any preventative maintenance steps I can take to avoid encountering OBDII code P1A79 Chevrolet in the future?

Regularly checking and maintaining the coolant temperature sensor, as well as ensuring the overall health of the engine's electrical system, can help prevent issues leading to this code.