AutoCodes – GMC – P1A65 GMC

P1A65 GMC Code - Starter/Generator Control Module Long Term Memory Performance

Quick Answer

What it means: P1A65 GMC indicates Starter/Generator Control Module Long Term Memory Performance.
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 854

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 P1A65 GMC 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 P1A65 GMC - Starter/Generator Control Module Long Term Memory Performance - AutoCodes.com — P1A65 GMC Code - Starter/Generator Control Module Long Term Memory Performance

What does this mean?

What are the Possible Causes of the DTC P1A65 GMC?

Faulty
harness is open or shorted
circuit poor electrical connection

How to Fix the DTC P1A65 GMC?

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 P1A65 GMC 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 P1A65 GMC 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 P1A65 GMC Code

What does the OBDII code P1A65 mean for GMC vehicles?

The OBDII code P1A65 indicates a performance issue with the Starter/Generator Control Module's long-term memory, which can affect the vehicle's hybrid or electric power management systems.

What are common symptoms associated with the P1A65 code?

Common symptoms may include warning lights on the dashboard, reduced engine performance, issues with starting the vehicle, or erratic behavior of the hybrid system.

What could cause the P1A65 code to trigger?

Causes can include a faulty Starter/Generator Control Module, poor electrical connections, software issues, or problems with the vehicle's battery systems leading to incorrect voltage readings.

Can I drive my GMC with the P1A65 code?

While you might be able to drive with this code, it is advisable to address it promptly, as it may affect the vehicle's performance and could lead to further issues if left unresolved.

What steps can I take to diagnose the P1A65 code?

Start by checking for any other related trouble codes, inspecting the wiring and connectors to the Starter/Generator Control Module, and verifying the battery's condition and voltage output.

What repairs might be necessary for the P1A65 code?

Repairs may include resetting or reprogramming the Starter/Generator Control Module, replacing it if faulty, or addressing any underlying electrical issues or battery problems.

How can I clear the P1A65 code from my vehicle's computer?

You can clear the P1A65 code using an OBDII scanner after addressing the underlying issue, or by disconnecting the vehicle's battery for a short period, but this may not resolve the root cause.

Is it safe to ignore the P1A65 code?

Ignoring the P1A65 code is not recommended, as it can lead to further performance issues and may eventually result in more costly repairs if the problem is not resolved.

Will a software update fix the P1A65 code?

In some cases, a software update from the manufacturer may resolve the P1A65 code if it is related to programming errors, but it's important to first diagnose any hardware issues.