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P0A02 Cadillac Code - Starter/Generator Control Module Coolant Temperature Sensor 1 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: P0A02 Cadillac indicates Starter/Generator Control Module Coolant Temperature Sensor 1 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 888

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 P0A02 Cadillac 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 P0A02 Cadillac - Starter/Generator Control Module Coolant Temperature Sensor 1 Circuit Low Voltage - AutoCodes.com — P0A02 Cadillac Code - Starter/Generator Control Module Coolant Temperature Sensor 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0A02 Cadillac?

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 P0A02 Cadillac?

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 P0A02 Cadillac 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 P0A02 Cadillac Code

What does the OBDII code P0A02 mean for my Cadillac?

The P0A02 code indicates that there is a low voltage condition detected in the Starter/Generator Control Module Coolant Temperature Sensor 1 circuit.

What are the common symptoms associated with the P0A02 code?

Common symptoms include poor engine performance, reduced fuel efficiency, warning lights on the dashboard, and potentially overheating of the starter/generator system.

What could cause the P0A02 code to trigger?

Causes may include a faulty coolant temperature sensor, damaged wiring or connectors, low coolant levels, or issues with the Starter/Generator Control Module itself.

How can I diagnose the P0A02 code?

To diagnose the P0A02 code, check the coolant temperature sensor's wiring for damage, test the sensor for proper operation, and ensure that the coolant level is adequate.

Is it safe to drive my Cadillac with the P0A02 code?

While it may be safe to drive short distances, it is advised to address the issue promptly to avoid potential engine or system damage.

What repairs are commonly needed for the P0A02 code?

Repairs may include replacing the coolant temperature sensor, repairing or replacing damaged wiring, or addressing issues with the Starter/Generator Control Module.

Can I clear the P0A02 code after repairs?

Yes, you can clear the P0A02 code using an OBDII scanner after making the necessary repairs, but ensure to verify that the issue has been resolved before doing so.

How can I prevent the P0A02 code from recurring?

Regular maintenance, including checking coolant levels, inspecting electrical connections, and ensuring sensors are functioning properly, can help prevent the P0A02 code from recurring.

Should I take my Cadillac to a dealer or a local mechanic for the P0A02 code?

Both options can be valid; however, a dealer may have more specific expertise with Cadillac vehicles, while a reputable local mechanic can also effectively diagnose and repair the issue.