P1AF2 Code - Drive Motor 2 Control Module Hybrid/EV Battery Voltage System Isolation Lost
Quick Answer
The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Common causes include Faulty Drive Motor 2 Control Module Hybrid/EV Battery, Drive Motor 2 Control Module Hybrid/EV Battery harness is open or shorted, Drive Motor 2 Control Module Hybrid/EV Battery 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
- P1AF2 indicates Drive Motor 2 Control Module Hybrid/EV Battery Voltage System Isolation Lost.
- Common causes
- Common causes include Faulty Drive Motor 2 Control Module Hybrid/EV Battery, Drive Motor 2 Control Module Hybrid/EV Battery harness is open or shorted, Drive Motor 2 Control Module Hybrid/EV Battery 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.
Code P1AF2 Description
Motor control modules' loss of isolation is detected through the use of two high-impedance resistors and voltage measuring circuitry. The two resistors are connected in series between the high- voltage positive and high-voltage negative circuits. The centre connection of the two resistors is also connected to vehicle chassis. The motor control module then measures the voltage drop across one of the resistors. Without a loss of isolation, the motor control module 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.
What are the Possible Causes of the DTC P1AF2?
- Faulty Drive Motor 2 Control Module Hybrid/EV Battery
- Drive Motor 2 Control Module Hybrid/EV Battery harness is open or shorted
- Drive Motor 2 Control Module Hybrid/EV Battery circuit poor electrical connection
How to Fix the DTC P1AF2?
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 P1AF2 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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Information for Specific Makes
- P1AF2 Buick — Drive Motor 2 Control Module Hybrid/EV Battery Voltage System Isolation Lost
- P1AF2 Cadillac — Drive Motor 2 Control Module Hybrid/EV Battery Voltage System Isolation Lost
- P1AF2 Chevrolet — Drive Motor 2 Control Module Hybrid/EV Battery Voltage System Isolation Lost
- P1AF2 GMC — Drive Motor 2 Control Module Hybrid/EV Battery Voltage System Isolation Lost
- P1AF2 Saturn — Drive Motor 2 Control Module Hybrid/EV Battery Voltage System Isolation Lost
Frequently Asked Questions about P1AF2 Code
1. What are common symptoms of OBDII code P1AF2?
- Common symptoms include loss of power, reduced fuel efficiency, and the vehicle going into a limp mode.
2. What does OBDII code P1AF2 indicate?
- This code indicates that the Drive Motor 2 Control Module in a hybrid or electric vehicle has detected a loss of isolation in the high-voltage battery system.
3. What are possible causes of code P1AF2?
- Possible causes include wiring issues, a faulty control module, a malfunctioning battery pack, or a problem with the high-voltage system components.
4. How can I diagnose OBDII code P1AF2?
- Diagnosing this code typically involves using a scan tool to retrieve the specific fault codes, checking the high-voltage system for any visible damage, and performing voltage tests on the battery system components.
5. Can I still drive my vehicle with OBDII code P1AF2 present?
- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the high-voltage system and potentially unsafe driving conditions.
6. How can I repair OBDII code P1AF2?
- Repairing this code may involve repairing or replacing damaged wiring, replacing the Drive Motor 2 Control Module, repairing the high-voltage battery pack, or addressing any other underlying issues causing the isolation loss.
7. Is it safe to clear the OBDII code P1AF2 and continue driving?
- It is not recommended to clear the code without addressing the underlying issue, as it can lead to further complications and potential safety hazards.
8. Can a DIY enthusiast fix OBDII code P1AF2 at home?
- While some basic troubleshooting steps can be done at home, diagnosing and repairing OBDII code P1AF2 often requires specialized tools and expertise, so it is recommended to seek professional help.
9. How much does it cost to repair OBDII code P1AF2?
- The cost of repairing this code can vary depending on the underlying issue, parts needed, and labor costs. It is recommended to get a diagnostic from a qualified technician to determine the exact cost.
10. How can I prevent OBDII code P1AF2 from occurring in the future?
- Regular maintenance, such as checking the high-voltage system components and wiring for wear or damage, can help prevent OBDII code P1AF2 from occurring.
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