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Engine-Codes – Generic – P1A79

P1A79 Code - Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage

Quick Answer

The P1A79 diagnostic trouble code (DTC) refers to an issue with the Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage in a vehicle. Common causes include Faulty Starter/Generator Control Module Coolant Temperature Sensor 3, Wiring or connector issues in the sensor circuit, Corrosion or damage in the sensor connections. 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 indicates Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage.
Common causes
Common causes include Faulty Starter/Generator Control Module Coolant Temperature Sensor 3, Wiring or connector issues in the sensor circuit, Corrosion or damage in the sensor connections.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1A79 Description

The P1A79 diagnostic trouble code (DTC) refers to an issue with the Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage in a vehicle. This sensor is responsible for monitoring the coolant temperature in the engine, providing crucial data for the engine control module to adjust fuel delivery and ignition timing. When the voltage from the sensor falls below the specified range, the control module triggers this code to indicate a problem with the sensor's circuit.

OBDII Code P1A79 - Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage
P1A79 Code - Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage

Common Causes of P1A79

  1. Faulty Starter/Generator Control Module Coolant Temperature Sensor 3
  2. Wiring or connector issues in the sensor circuit
  3. Corrosion or damage in the sensor connections
  4. Malfunctioning engine control module

Symptoms of P1A79

  1. Decreased fuel efficiency
  2. Rough idling or hesitation
  3. Engine stalling
  4. Difficulty starting the vehicle
  5. Check Engine Light illuminated

How to Fix P1A79

  1. Begin by performing a visual inspection of the sensor wiring and connectors for any signs of damage or corrosion.
  2. Test the Starter/Generator Control Module Coolant Temperature Sensor 3 with a multimeter to check for proper resistance and voltage readings.
  3. If the sensor is faulty, replace it with a new one and ensure proper installation.
  4. Clear the DTC using a scan tool and test drive the vehicle to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the control module or wiring.

Cost to Fix P1A79

The typical repair costs for addressing the P1A79 code can vary depending on the specific vehicle make and model, as well as the labor rates in different locations. On average, the parts cost for a new Starter/Generator Control Module Coolant Temperature Sensor 3 ranges from $50 to $100, while the labor cost for diagnosis and replacement can range from $100 to $200. Additional costs may apply if further diagnostics or repairs are needed. It is advisable to consult with a professional mechanic or auto repair shop for a more accurate estimate based on the individual circumstances.

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Code P1A79 Information for Specific Makes

  • P1A79 Buick — Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage
  • P1A79 Cadillac — Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage
  • P1A79 Chevrolet — Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage
  • P1A79 GMC — Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low Voltage
  • P1A79 Saturn — Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit Low 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 P1A79 Code

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

- Common symptoms include poor engine performance, reduced fuel efficiency, and potential starting issues.

2. What typically causes the OBDII code P1A79 to trigger?

- The P1A79 code is often triggered by a malfunction in the Starter/Generator Control Module Coolant Temperature Sensor 3, leading to low voltage readings.

3. How can I diagnose the root cause of OBDII code P1A79?

- A thorough diagnostic process involving checking the sensor wiring, connections, and sensor itself using a multimeter or scan tool is recommended to pinpoint the issue.

4. Can a faulty coolant temperature sensor cause the P1A79 code?

- Yes, a faulty coolant temperature sensor can cause the P1A79 code if it is providing low voltage signals to the control module.

5. What are some repair tips for addressing the P1A79 code?

- Repair tips may include checking and replacing the Starter/Generator Control Module Coolant Temperature Sensor 3, ensuring proper wiring connections, and clearing the code after repairs.

6. How urgent is it to address the OBDII code P1A79?

- While the vehicle may still be operational with the P1A79 code, addressing it promptly is recommended to prevent potential engine performance issues and further damage.

7. Can I drive my vehicle with the P1A79 code present?

- It is generally not recommended to drive the vehicle with the P1A79 code present, as it can lead to poor engine performance and potentially other related problems.

8. Is it possible to clear the P1A79 code without fixing the underlying issue?

- While clearing the code may temporarily turn off the check engine light, it is crucial to address the root cause of the P1A79 code to prevent it from reoccurring.

9. Are there any common related codes that may accompany the P1A79 code?

- Other related codes that may accompany P1A79 include issues with the Starter/Generator Control Module or other coolant temperature sensor circuits.

10. What is the typical cost to repair the OBDII code P1A79?

- The cost to repair the P1A79 code can vary depending on the exact cause of the issue, but it may involve sensor replacement, wiring repairs, or module reprogramming, potentially ranging from $100 to $500 or more.

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