P1AF5 Buick Code - Drive Motor 1 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
- P1AF5 Buick indicates Drive Motor 1 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.
Code P1AF5 Buick Description
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.
What are the Possible Causes of the DTC P1AF5 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 P1AF5 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 P1AF5 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 P1AF5 Buick Code
1. What does the OBDII code P1AF5 mean on a Buick?
P1AF5 indicates an issue with the Drive Motor 1 Control Module, specifically a problem with the Hybrid Battery Voltage Isolation Sensor Circuit detecting high voltage.
2. What are the common symptoms of code P1AF5 in a Buick?
Symptoms may include the illumination of the check engine light, reduced fuel efficiency, limited drivability, and possible loss of hybrid functionality.
3. What causes the P1AF5 code to appear?
Common causes include a faulty hybrid battery voltage isolation sensor, wiring issues, a damaged Drive Motor 1 Control Module, or high-voltage circuit problems.
4. Can I still drive my Buick with the P1AF5 code active?
Driving with this code is not recommended as it can indicate high-voltage issues that may pose safety risks or cause further damage to the hybrid system.
5. How do I diagnose the P1AF5 code on my Buick?
Diagnosis involves using an advanced scan tool to read the code, inspecting the voltage isolation sensor, checking wiring and connections, and testing the hybrid battery and control module.
6. What repairs can fix the P1AF5 code in a Buick?
Repairs may include replacing the voltage isolation sensor, repairing or replacing damaged wiring, or addressing issues with the Drive Motor 1 Control Module.
7. How much does it cost to fix the P1AF5 code?
Repair costs vary depending on the exact issue, but replacing a voltage isolation sensor or repairing wiring can range from $150 to $500, with higher costs for module replacement.
8. Can a bad hybrid battery cause the P1AF5 code?
Yes, a malfunctioning hybrid battery can contribute to voltage isolation issues, leading to the P1AF5 code.
9. Will clearing the P1AF5 code solve the problem?
Clearing the code without addressing the underlying issue is only a temporary fix, and the code will likely return.
10. Can low hybrid battery charge cause the P1AF5 code?
Low charge alone typically doesn’t trigger this code, but issues in the high-voltage circuit related to the battery can be a contributing factor.
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