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 is having trouble talking to the part that controls one of the electric motors. It's like when your phone can't connect to Wi-Fi.
The vehicle's control module is not receiving the expected signal from the drive motor 'B' control module, indicating a communication error.
The P1E45 code is triggered when the Powertrain Control Module (PCM) detects an incorrect or missing signal from the control module responsible for managing Drive Motor 'B'. This could be due to a fault in the wiring, a malfunctioning control module, or a software issue.
• Reduced vehicle performance
• Warning light on the dashboard
• Possible inability to drive using electric power
• Faulty drive motor 'B' control module
• Damaged or corroded wiring or connectors
• Software issues in the control module
PCM: Powertrain Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Perform a visual inspection of the wiring and connectors related to drive motor 'B'.
• Use a diagnostic scanner to check for additional codes.
• Test the drive motor 'B' control module for proper operation.
• Repair or replace damaged wiring or connectors.
• Reprogram or update the control module software.
• Replace the drive motor 'B' control module if faulty.
• OBD-II diagnostic scanner
• Multimeter
• Basic hand tools
$200 - $800
Moderate
• Chevrolet Volt
• Nissan Leaf
• BMW i3
• Regular maintenance checks on wiring and connectors.
• Software updates from the manufacturer.
• Avoiding exposure of the vehicle's electronics to moisture.
Communication Error
• Avoid driving long distances until the issue is resolved.
• Consult a professional mechanic for diagnosis and repair.
Check with the vehicle manufacturer for warranty coverage on drive motor components.
This code has become more common with the rise of electric and hybrid vehicles, as they rely heavily on electronic communication between components.
Moderate – While the vehicle may still operate, performance could be affected, and it should be addressed soon to avoid further issues.
Driving with this code may not comply with emissions regulations and could affect vehicle safety.
• Vehicle at operating temperature
• Drive motor 'B' engaged
The drive motor 'B' control module is typically located near the electric motor it controls, often in the engine bay or under the vehicle.
Q: Can I drive my car with a P1E45 code?
A: It's possible, but not recommended as it may affect performance and could lead to further damage.
Q: Will a P1E45 code clear itself?
A: The code may clear if the issue is intermittent and resolves itself, but it's best to have it checked by a professional.
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.