Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with the sensor that checks the electrical isolation of the second motor's voltage. It's like a safety check to make sure electricity isn't leaking where it shouldn't be.
The P1AF7 code indicates an issue with the voltage isolation sensor circuit of Drive Motor 'B', suggesting that the sensor is reading a higher voltage than expected.
The Drive Motor 'B' Voltage Isolation Sensor Circuit High code is triggered when the vehicle's powertrain control module (PCM) detects a high voltage condition in the isolation sensor circuit for the second electric drive motor. This sensor is crucial for ensuring that the motor's electrical system is properly isolated from the vehicle's chassis to prevent electrical shorts or shocks.
• Check Engine Light is on
• Reduced vehicle performance
• Unusual noises from the electric motor
• Faulty voltage isolation sensor
• Damaged wiring or connectors
• Malfunctioning PCM
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics II
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the voltage isolation sensor for proper operation.
• Replace the faulty voltage isolation sensor.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $600
Moderate
• Chevrolet Volt
• Nissan Leaf
• Toyota Prius
• Regular maintenance checks
• Ensure all electrical connections are secure
• Avoid exposure to extreme moisture
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional as soon as possible.
Check with the vehicle manufacturer for warranty coverage on hybrid or electric drive components.
This code has been reported in vehicles with electric or hybrid drive systems, often due to sensor wear or environmental factors affecting wiring.
Moderate – Addressing this issue promptly can prevent further electrical problems.
Driving with an unresolved electrical isolation issue may pose a safety risk. Always follow vehicle safety guidelines.
• Vehicle must be in a safe, dry environment.
• Ensure the battery is fully charged.
The voltage isolation sensor is typically located near the drive motor or integrated into the motor control module.
Q: Can I drive my car with this code?
A: It's not recommended to drive for extended periods with this code, as it may lead to further electrical issues.
Q: How do I reset the Check Engine Light?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is resolved, the light should stay off.
Pro · Four-system diagnostics
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Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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