AutoCodes – Generic – P1A4F

P1A4F Code - Drive Motor 1 Control Module Not Programmed

Quick Answer

The drive motor control modules are internal to the Power Inverter Module, often referred to as the drive motor-generator Power Inverter Module, and are not serviced separately. Common causes include Faulty Power Inverter Module (PIM), Power Inverter Module (PIM) harness is open or shorted, Power Inverter Module (PIM) 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: P1A4F indicates Drive Motor 1 Control Module Not Programmed.
Common causes: Common causes include Faulty Power Inverter Module (PIM), Power Inverter Module (PIM) harness is open or shorted, Power Inverter Module (PIM) 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 1,326

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 Aug 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A4F Description

The drive motor control modules are internal to the Power Inverter Module, often referred to as the drive motor-generator Power Inverter Module, and are not serviced separately. This fault is handled inside the drive motor control modules and no external circuits are involved. The Diagnostic Trouble Code (DTC) will set when the Power Inverter Module has detected an internal malfunction, or a service module has been installed but not yet programmed.

OBDII Code P1A4F - Drive Motor 1 Control Module Not Programmed - AutoCodes.com — P1A4F Code - Drive Motor 1 Control Module Not Programmed

What does this mean?

What are the Possible Causes of the DTC P1A4F?

Faulty Power Inverter Module (PIM)
Power Inverter Module (PIM) harness is open or shorted
Power Inverter Module (PIM) circuit poor electrical connection

How to Fix the DTC P1A4F?

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 P1A4F 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 P1A4F code?

Need more information on how to fix the P1A4F code? Get Access to Factory Service Manuals

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Information for Specific Makes

P1A4F Buick — Drive Motor 1 Control Module Not Programmed
P1A4F Cadillac — Drive Motor 1 Control Module Not Programmed
P1A4F Chevrolet — Drive Motor 1 Control Module Not Programmed
P1A4F GMC — Drive Motor 1 Control Module Not Programmed

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 P1A4F Code

1. What does the OBDII code P1A4F mean?

P1A4F indicates that the Drive Motor 1 Control Module is not programmed or has lost its programming, which can prevent proper communication and functionality.

2. What are the common symptoms of code P1A4F?

Symptoms may include reduced vehicle performance, inability to engage the hybrid or electric drive system, a check engine light, and possible warning messages on the dashboard.

3. What causes the P1A4F code to appear?

The code is typically caused by a missing or corrupted software program in the Drive Motor 1 Control Module, often due to a failed update, a replaced module, or electrical issues.

4. Can I drive my car with the P1A4F code?

Driving with this code is not recommended, as it can lead to reduced performance or failure of the hybrid or electric drive system, potentially leaving the vehicle inoperable.

5. How is code P1A4F diagnosed?

A technician will use a diagnostic scanner to confirm the code, check the module's programming status, inspect for related electrical issues, and verify communication with other systems.

6. What is the typical repair for a P1A4F code?

The most common repair is reprogramming or flashing the Drive Motor 1 Control Module with the latest software using a manufacturer-approved tool.

7. Do I need to replace the Drive Motor 1 Control Module to fix P1A4F?

Replacement is not always necessary; reprogramming the module often resolves the issue. However, if the module is physically damaged, it may need to be replaced.

8. How much does it cost to fix a P1A4F code?

Costs vary depending on the vehicle and repair shop, but reprogramming typically ranges from $100 to $300. Module replacement, if required, can cost significantly more.

9. Can I fix the P1A4F code myself?

Reprogramming requires specialized tools and software that are usually only available to dealerships or qualified repair shops, so it's not recommended as a DIY repair.

10. How can I prevent the P1A4F code from reappearing?

Ensure that software updates and module replacements are performed by qualified technicians using manufacturer-approved tools. Avoid interrupting module programming processes.