P1AF2 Buick 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 Buick 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 Buick 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 Buick?
- 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 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 P1AF2 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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Frequently Asked Questions about P1AF2 Buick Code
1. What does the OBDII code P1AF2 mean for a Buick?
P1AF2 indicates that the Drive Motor 2 Control Module has detected a loss of isolation in the hybrid/EV battery voltage system.
2. What are the symptoms of P1AF2 on a Buick?
Symptoms may include warning lights on the dashboard, reduced power delivery, difficulty in starting the vehicle, or the vehicle entering a limited performance mode.
3. What causes the P1AF2 code to appear on a Buick?
Common causes include damaged battery wiring, moisture intrusion, insulation failure in the high-voltage system, or a malfunction in the Drive Motor 2 Control Module.
4. Can I drive my Buick with the P1AF2 code?
It is not recommended to drive the vehicle with this code active, as it can indicate a high-voltage electrical issue that may pose safety risks.
5. How is the P1AF2 code diagnosed on a Buick?
Diagnosis typically involves scanning the vehicle with an OBDII tool, inspecting the hybrid/EV battery system, checking for damaged wiring or connectors, and performing isolation resistance tests.
6. What repairs are needed to fix the P1AF2 code on a Buick?
Repairs may involve replacing damaged wiring or connectors, addressing insulation failures, repairing or replacing the hybrid battery, or reprogramming the Drive Motor 2 Control Module.
7. Can a bad hybrid battery cause the P1AF2 code?
Yes, a failing hybrid battery or compromised insulation within the battery pack can trigger this code.
8. What is the cost to fix the P1AF2 code on a Buick?
Costs can vary widely depending on the root cause but may range from $200 for minor wiring repairs to several thousand dollars if the hybrid battery or control module needs replacement.
9. Is the P1AF2 code specific to Buick hybrid or EV models?
Yes, this code is specific to Buick hybrid or electric vehicles equipped with a Drive Motor 2 Control Module.
10. Can moisture in the high-voltage system cause the P1AF2 code?
Yes, moisture intrusion can compromise the isolation of the high-voltage system and lead to this code being triggered.
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