AutoCodes – Buick – P1AC0 Buick

P1AC0 Buick Code - Starter/Generator Control Module Output Circuit

Quick Answer

The Starter/Generator Control Module (SGCM) coolant pump/fan relay supplies battery voltage to the SGCM coolant pump relay and the SGCM coolant fan relay. Common causes include Faulty Starter/Generator Control Module Cooling Fan Relay, Starter/Generator Control Module Cooling Fan Relay harness is open or shorted, Starter/Generator Control Module Cooling Fan Relay 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
P1AC0 Buick indicates Starter/Generator Control Module Output Circuit.
Common causes
Common causes include Faulty Starter/Generator Control Module Cooling Fan Relay, Starter/Generator Control Module Cooling Fan Relay harness is open or shorted, Starter/Generator Control Module Cooling Fan Relay 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.
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 851
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Mar 01, 2020
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Code P1AC0 Buick Description

The Starter/Generator Control Module (SGCM) coolant pump/fan relay supplies battery voltage to the SGCM coolant pump relay and the SGCM coolant fan relay. The SGCM monitors the temperature of the low side driver for the SGCM coolant pump/fan relay. The temperature sensor of the driver is not serviceable and the data for this sensor is not available on the scan tool. This internal driver temperature sensor aids in detecting a control circuit shorted to ground or a shorted relay coil.
OBDII Code P1AC0 Buick - Starter/Generator Control Module Output Circuit - AutoCodes.com
P1AC0 Buick Code - Starter/Generator Control Module Output Circuit

What are the Possible Causes of the DTC P1AC0 Buick?

  • Faulty Starter/Generator Control Module Cooling Fan Relay
  • Starter/Generator Control Module Cooling Fan Relay harness is open or shorted
  • Starter/Generator Control Module Cooling Fan Relay circuit poor electrical connection

How to Fix the DTC P1AC0 Buick?

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 P1AC0 Buick 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 P1AC0 Buick code?

Need more information on how to fix the P1AC0 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1AC0 Buick code diagnosed by a professional: Find a repair shop in your area

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 P1AC0 Buick Code

1. What are the common symptoms of OBDII code P1AC0 in a Buick related to the Starter/Generator Control Module Output Circuit?

The common symptoms include issues with starting the vehicle, decreased engine performance, and possible stalling.

2. What are the potential causes of OBDII code P1AC0 in a Buick related to the Starter/Generator Control Module Output Circuit?

Possible causes include faulty wiring, a malfunctioning starter/generator control module, or a problem with the electrical connections.

3. How can I diagnose OBDII code P1AC0 in my Buick related to the Starter/Generator Control Module Output Circuit?

Diagnosis typically involves using a diagnostic scanner to read the trouble codes, inspecting the wiring and connections, and testing the starter/generator control module for proper functionality.

4. What are some repair tips for resolving OBDII code P1AC0 in a Buick related to the Starter/Generator Control Module Output Circuit?

Repair tips may include repairing or replacing damaged wiring, ensuring all connections are secure, and replacing the starter/generator control module if necessary.

5. Can I continue driving my Buick with OBDII code P1AC0 related to the Starter/Generator Control Module Output Circuit?

It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage and potential safety hazards.

6. How much does it typically cost to repair OBDII code P1AC0 in a Buick related to the Starter/Generator Control Module Output Circuit?

Repair costs can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Are there any preventive measures to avoid OBDII code P1AC0 related to the Starter/Generator Control Module Output Circuit in my Buick?

Regular vehicle maintenance, such as checking the electrical system and connections, can help prevent issues that may trigger this trouble code.

8. Can a DIY enthusiast fix OBDII code P1AC0 related to the Starter/Generator Control Module Output Circuit in a Buick?

Depending on your skills and experience with automotive repairs, you may be able to address simple issues like checking connections or replacing damaged wiring. However, more complex repairs may require professional assistance.

9. How urgent is it to address OBDII code P1AC0 related to the Starter/Generator Control Module Output Circuit in my Buick?

It is advisable to address this code promptly to avoid potential further damage to the vehicle and ensure safe operation.

10. Will resetting the trouble codes make OBDII code P1AC0 related to the Starter/Generator Control Module Output Circuit disappear permanently?

Resetting the trouble codes may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after some driving cycles.

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