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 voltage for the electric motor. It's like the sensor is saying the voltage is too high.
The vehicle's control module monitors the voltage sensor for the drive motor 'A'. If the voltage reading is higher than expected, the P1AE9 code is triggered.
The P1AE9 code is set when the Powertrain Control Module (PCM) detects an abnormally high voltage signal from the drive motor 'A' voltage sensor. This sensor is responsible for monitoring the voltage level of the drive motor to ensure it operates within the specified range.
• Check Engine Light illuminated
• Reduced vehicle performance
• Possible issues with electric motor operation
• Faulty drive motor 'A' voltage sensor
• Wiring issues such as short circuits or open circuits
• Malfunctioning Powertrain Control Module (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 related to the voltage sensor.
• Test the drive motor 'A' voltage sensor for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty drive motor 'A' voltage sensor.
• Reprogram or replace the PCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Chevrolet Volt
• Nissan Leaf
• Toyota Prius
• Regular maintenance checks
• Ensure wiring is secure and undamaged
• Use quality replacement parts
Sensor Issue
• Have the vehicle inspected by a professional.
• Avoid driving the vehicle until the issue is resolved.
Check with your vehicle manufacturer for warranty coverage on powertrain components.
This code is more common in hybrid and electric vehicles due to their reliance on electric drive motors.
Moderate – While the vehicle may still be drivable, it is recommended to address the issue to avoid further damage.
Ignoring this code may lead to reduced vehicle performance and efficiency. It's important to address it promptly.
• Vehicle at operating temperature
• Drive motor engaged
The drive motor 'A' voltage sensor is typically located near the drive motor or integrated within the motor control unit.
Q: Can I drive with the P1AE9 code?
A: It's not recommended as it may affect vehicle performance and efficiency.
Q: How do I clear the P1AE9 code?
A: The code can be cleared with an OBD-II scanner after repairs, but it may return if the issue is not fixed.
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.