Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer detected a problem with the power supply to one of the electric motors. It's like when a toy's battery is not connected properly, and it can't run.
This code indicates that there is an issue with the isolation of the power supply circuit for Drive Motor 'B' in a hybrid or electric vehicle.
The P1AF3 code is set when the vehicle's control module detects a fault in the isolation of the power supply circuit for Drive Motor 'B'. This could be due to a short circuit, open circuit, or other electrical fault that affects the motor's power supply.
• Check Engine Light is on
• Reduced vehicle performance
• Unusual noises from the motor
• Faulty isolation in the power supply circuit
• Damaged wiring or connectors
• Defective drive motor
Drive Motor: An electric motor that powers the vehicle.
Isolation Fault: A problem where electrical current is not properly contained within its circuit.
• Inspect the wiring and connectors for damage.
• Check the isolation of the power supply circuit.
• Test the drive motor for faults.
• Repair or replace damaged wiring and connectors.
• Ensure proper isolation of the power supply circuit.
• Replace the drive motor if necessary.
• Multimeter
• Insulation tester
• OBD-II scanner
$300 - $1500
Difficult
• Chevrolet Volt
• Nissan Leaf
• Toyota Prius
• Regular maintenance checks
• Avoid driving through deep water
• Inspect electrical components periodically
Electrical Circuit Issue
• Avoid driving the vehicle until repaired.
• Consult a professional mechanic for diagnosis.
Repairs may be covered under the vehicle's powertrain or hybrid system warranty.
This code has been reported in hybrid and electric vehicles, often related to issues with the high-voltage system.
High – This issue can affect vehicle performance and safety.
Driving with this fault may lead to reduced performance or safety hazards. Consult a professional mechanic immediately.
• Vehicle in Park
• Ignition on
The drive motor and its power supply circuit are typically located near the vehicle's axle or transmission area.
Q: Can I drive my car with a P1AF3 code?
A: It's not recommended to drive with this code as it may affect vehicle performance and safety.
Q: How can I prevent this code from appearing?
A: Regular maintenance and inspections of the vehicle's electrical system can help prevent this issue.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.