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P1A7A Saturn 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 Saturn 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 1,305

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

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 Saturn?

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 Saturn 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 Saturn 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 Saturn Code

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

P1A7A indicates a problem with the Starter/Generator Control Module Coolant Temperature Sensor 3 Circuit, specifically detecting high voltage in the circuit.

2. What are the symptoms of the P1A7A code?

Symptoms may include an illuminated check engine light, reduced engine performance, potential overheating issues, and abnormal hybrid system behavior if applicable.

3. What causes the P1A7A code on a Saturn?

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

4. Can I drive my Saturn with the P1A7A code?

Itâ€™s not recommended as the issue could lead to overheating or damage to the Starter/Generator system, potentially causing more expensive repairs.

5. How do I diagnose the P1A7A code?

Diagnosis involves using a scan tool to monitor sensor readings, inspecting the wiring and connectors for damage, and testing the coolant temperature sensor for proper operation.

6. How can I fix the P1A7A code on my Saturn?

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

7. How much does it cost to repair the P1A7A code?

Repair costs can vary, but replacing a coolant temperature sensor typically costs between $50 and $200, while more extensive repairs like module replacement can cost significantly more.

8. Can a bad thermostat cause the P1A7A code?

While unlikely, a malfunctioning thermostat could contribute to abnormal temperature readings, but the code specifically points to an electrical issue in the sensor circuit.

9. Does the P1A7A code affect fuel efficiency?

Yes, it can. If the system cannot monitor coolant temperature accurately, it may impact engine or hybrid system performance, reducing fuel efficiency.

10. Do I need to clear the P1A7A code after repairs?

Yes, after completing repairs, use an OBDII scanner to clear the code and verify that it does not return during a test drive.