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P1AF7 Buick Code - Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage

Quick Answer

The drive motor generator Power Inverter Control Module (PIM) contains two Motor Control Modules (MCMs). Common causes include Reprogram Power Inverter Control Module (PIM), Faulty Power Inverter Control Module (PIM), Power Inverter Control Module (PIM) harness is open or shorted. 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: P1AF7 Buick indicates Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage.
Common causes: Common causes include Reprogram Power Inverter Control Module (PIM), Faulty Power Inverter Control Module (PIM), Power Inverter Control Module (PIM) harness is open or shorted.
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 857

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 Mar 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1AF7 Buick Description

The drive motor generator Power Inverter Control Module (PIM) contains two Motor Control Modules (MCMs). Each MCM measures hybrid battery High Voltage (HV) with several internal sensors. The MCMs test for Loss Ff Isolation (LOI) between either the HV positive circuit or HV negative circuit and vehicle chassis. The MCMs test for isolation when the HV contactor relays are closed. The battery energy control module (BECM) only tests the hybrid battery assembly for HV loss of isolation when the HV contactor relays are open.
MCM LOI is detected through the use of two high-impedance resistors and voltage measuring circuitry. The two resistors are connected in series between the HV positive and HV negative circuits. The center connection of the two resistors is also connected to vehicle chassis. The MCM then measures the voltage drop across one of the resistors. Without a loss of isolation, the MCM should measure about half of the high voltage potential. This is referred to as mid-pack voltage. The Mid-pack voltage value is then doubled by the software and displayed on a scan tool as Motor 1 Isolation Voltage or Motor 2 Isolation Voltage. When a loss of isolation is present, the motor isolation voltage display will indicate voltage that is more or less than actual hybrid battery high voltage. The MCM monitors the LOI voltage measuring circuitry for correct operation.

OBDII Code P1AF7 Buick - Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage - AutoCodes.com — P1AF7 Buick Code - Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1AF7 Buick?

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

How to Fix the DTC P1AF7 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 P1AF7 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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Need Help with the 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 P1AF7 Buick Code

1. What are the common symptoms of OBDII code P1AF7 in a Buick related to the Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage?

- Common symptoms include the Check Engine light illuminating, reduced hybrid system performance, and potential issues with the hybrid battery.

2. What could cause the Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage code P1AF7 in a Buick?

- Possible causes include a faulty isolation sensor, wiring issues, or problems with the hybrid battery system.

3. How can I diagnose the OBDII code P1AF7 related to the Drive Motor 2 Control Module in my Buick?

- Diagnostic steps may include checking the wiring and connections related to the isolation sensor, testing the sensor itself, and inspecting the hybrid battery system for any issues.

4. Can I continue driving my Buick with the P1AF7 code related to the Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the hybrid system. It's best to address the issue promptly.

5. How serious is the OBDII code P1AF7 in a Buick with regards to the Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage?

- This code is considered serious as it pertains to the high voltage circuit in the hybrid system, which can impact the vehicle's performance and safety.

6. Are there any common repair tips for fixing the P1AF7 code related to the Drive Motor 2 Control Module in a Buick?

- Repair tips may include checking and cleaning the sensor connections, inspecting for any visible wiring issues, and consulting a professional for further diagnosis and repair.

7. How much does it typically cost to repair the OBDII code P1AF7 related to the Drive Motor 2 Control Module in a Buick?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay for sensor replacement, wiring repairs, or potential hybrid system component fixes.

8. Can a DIY enthusiast fix the P1AF7 code related to the Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage in a Buick?

- While some basic checks and maintenance tasks can be performed by a DIYer, diagnosing and repairing complex hybrid system issues may require specialized knowledge and equipment best handled by a professional.

9. Is it possible for the OBDII code P1AF7 in a Buick to reoccur after repair of the Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage issue?

- If the root cause of the problem is not properly addressed during the repair, there is a possibility for the code to reoccur. Thorough diagnosis and repair are essential.

10. How long does it typically take to repair the OBDII code P1AF7 related to the Drive Motor 2 Control Module in a Buick?

- The repair time can vary based on the specific issue causing the code, but it may take a few hours to a full day for diagnosis and repair by a qualified technician.