AutoCodes – Buick – P1A64 Buick

P1A64 Buick Code - Starter/Generator Control Module Reset

Quick Answer

What it means: P1A64 Buick indicates Starter/Generator Control Module Reset.
Common causes: Common causes include Faulty, harness is open or shorted, 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 914

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 19, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A64 Buick Description

The purpose of the Accessory Power Module (APM), integral to the Starter/Generator Control Module (SGCM), is to control the amount and direction of energy flowing between the 42 V DC and 14 V DC buses via the APM, bi-directional 42 V DC to 14 V DC converter. All APM functions will only be run when in the enable mode. APM current will be defined as the current flowing through the outputs. APM power is bi-directional, with negative current representing 14-42 direction, and positive current representing the 42-14 direction.
When the APM Power Conversion direction is set to a value of 42 V to 14 V, the energy will flow from the 42 V DC Bus to the 14 V DC Bus via the APM. When the Service Charge or jump starting is requested, the energy will flow from the 14 V DC Bus to the 42 V DC Bus via the APM. When the APM Power Conversion direction is set to a value of Off, the APM will be turned off, and not consume or transfer any power. When the APM Power Conversion direction is set to a value of Invalid, the energy will flow from the 42 V DC Bus to the 14 V DC Bus via the APM.

OBDII Code P1A64 Buick - Starter/Generator Control Module Reset - AutoCodes.com — P1A64 Buick Code - Starter/Generator Control Module Reset

What does this mean?

What are the Possible Causes of the DTC P1A64 Buick?

Faulty
harness is open or shorted
circuit poor electrical connection

How to Fix the DTC P1A64 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 P1A64 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.

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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 P1A64 Buick Code

1. What does the OBDII code P1A64 mean on a Buick?

P1A64 indicates an issue with the Starter/Generator Control Module Reset, which relates to the hybrid or electric system's control module functionality.

2. What are the common symptoms of the P1A64 code on a Buick?

Common symptoms include a check engine light, reduced fuel efficiency, limited hybrid or electric performance, and possible trouble starting the vehicle.

3. What causes the P1A64 code to trigger on a Buick?

The code is often caused by a faulty Starter/Generator Control Module, wiring issues, low voltage conditions, or software glitches in the control module.

4. Can driving with the P1A64 code damage my Buick?

Yes, continuing to drive with this code may lead to performance issues, reduced efficiency, or further damage to the hybrid or electric system components.

5. How do you diagnose the P1A64 code on a Buick?

A technician typically checks the Starter/Generator Control Module for faults, inspects the wiring and connections, and may perform a software update or system reset.

6. Is the Starter/Generator Control Module expensive to replace?

The cost can vary but replacing the module could be expensive, ranging from a few hundred to over a thousand dollars, depending on labor and parts.

7. Can I fix the P1A64 code on my Buick myself?

DIY repairs are possible but not recommended unless you have advanced knowledge of hybrid or electric systems and proper diagnostic tools.

8. Does the P1A64 code always mean the Starter/Generator Control Module is faulty?

No, the issue could also stem from a poor electrical connection, blown fuse, or software malfunction rather than the module itself.

9. Will resetting the code fix the P1A64 error on my Buick?

Resetting the code may clear it temporarily, but the underlying issue must be addressed to prevent the code from returning.

10. How can I prevent the P1A64 code from occurring again?

Regular maintenance, ensuring the battery and wiring are in good condition, and addressing any hybrid system issues promptly can help prevent this code.