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 has a problem with the software that controls one of the electric motors.
This code indicates an issue with the programming or software of the control module responsible for managing the operation of Drive Motor 'B'.
The P1AFA code is set when the vehicle's control module detects a problem with the programming of the Drive Motor 'B' control module. This could be due to corrupted software, incorrect programming, or a failed update.
• Check Engine Light is on
• Reduced vehicle performance
• Unusual noises from the motor
• Corrupted software in the control module
• Failed software update
• Incorrect programming of the control module
Control Module: A computer in the vehicle that controls various functions.
Software Update: A process to install new software to fix bugs or improve performance.
• Use an OBD-II scanner to confirm the code.
• Check for any available software updates for the control module.
• Inspect the wiring and connections to the control module for damage.
• Reprogram the control module with the latest software.
• Replace the control module if reprogramming fails.
• Ensure all connections to the module are secure and undamaged.
• OBD-II scanner
• Diagnostic software
• Basic hand tools
$200 - $600
Moderate
• Chevrolet Volt
• Nissan Leaf
• Toyota Prius
• Regularly update vehicle software.
• Avoid interrupting software updates.
• Have the vehicle serviced by professionals.
Control Module Programming Issue
• Do not ignore the Check Engine Light.
• Seek professional diagnostics if unsure.
• Keep software up to date.
Check with the vehicle manufacturer for warranty coverage on control module issues.
This code has been more prevalent in vehicles with complex hybrid or electric systems due to the reliance on software for motor control.
Moderate – While the vehicle may still operate, performance could be affected, and ignoring the issue could lead to further problems.
Operating a vehicle with a known issue could lead to safety risks and may void warranties if not addressed.
• Vehicle in a safe, stationary position.
• Access to diagnostic tools and software.
The control module is typically located near the drive motor, often in the engine bay or under the vehicle.
Q: Can I continue driving with a P1AFA code?
A: It's possible, but not recommended, as it may affect vehicle performance.
Q: Is a software update always required for this code?
A: Not always, but it's a common solution. A professional diagnosis is recommended.
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.