P1AF0 Buick Code - Drive Motor 1 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 1 Control Module Hybrid/EV Battery, Drive Motor 1 Control Module Hybrid/EV Battery harness is open or shorted, Drive Motor 1 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
- P1AF0 Buick indicates Drive Motor 1 Control Module Hybrid/EV Battery Voltage System Isolation Lost.
- Common causes
- Common causes include Faulty Drive Motor 1 Control Module Hybrid/EV Battery, Drive Motor 1 Control Module Hybrid/EV Battery harness is open or shorted, Drive Motor 1 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 P1AF0 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 P1AF0 Buick?
- Faulty Drive Motor 1 Control Module Hybrid/EV Battery
- Drive Motor 1 Control Module Hybrid/EV Battery harness is open or shorted
- Drive Motor 1 Control Module Hybrid/EV Battery circuit poor electrical connection
How to Fix the DTC P1AF0 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 P1AF0 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 P1AF0 Buick Code
1. What does the OBDII code P1AF0 mean on a Buick?
The P1AF0 code indicates that the Drive Motor 1 Control Module has detected a loss of voltage system isolation in the hybrid or EV battery.
2. What are the symptoms of code P1AF0 on a Buick?
Common symptoms include warning lights on the dashboard, reduced hybrid or EV performance, possible failure to start, and limited driving range.
3. What causes the P1AF0 code on a Buick?
This code is typically caused by damaged or degraded insulation in the hybrid/EV battery system, moisture intrusion, or wiring faults leading to voltage isolation loss.
4. Can I drive my Buick with the P1AF0 code?
It is not recommended to drive the vehicle with this code, as it may compromise the safety and performance of the hybrid/EV system.
5. How is the P1AF0 code diagnosed on a Buick?
Technicians use a scan tool to confirm the code and then inspect the hybrid battery, wiring, and related components for insulation damage or moisture.
6. What repairs are necessary to fix code P1AF0 on a Buick?
Repairs may involve replacing damaged wiring, addressing battery insulation issues, or repairing or replacing the hybrid battery if necessary.
7. How much does it cost to repair the P1AF0 code on a Buick?
Repair costs vary widely depending on the severity of the issue, ranging from a few hundred dollars for wiring repairs to several thousand dollars for battery replacement.
8. Can moisture cause the P1AF0 code on a Buick?
Yes, moisture intrusion into the hybrid/EV battery or wiring can lead to voltage isolation loss and trigger this code.
9. Is the P1AF0 code specific to Buick hybrid/EV vehicles?
While this code is specific to hybrid or EV systems, it may also appear on other GM vehicles with similar technology.
10. Do I need a dealership to fix the P1AF0 code on a Buick?
It is often best to visit a dealership or qualified EV/hybrid specialist, as they have the tools and expertise to safely diagnose and repair high-voltage systems.
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