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 pump that helps keep the electric parts of a hybrid or electric car cool is spinning too fast because it doesn't have enough liquid to move around.
The code indicates that the electronics coolant pump in a hybrid or electric vehicle is running at an excessive speed, likely due to a lack of coolant, which can cause the pump to 'dry run'.
The P2E46 code is triggered when the control module detects that the electronics coolant pump B is operating at a higher speed than normal, which usually happens when there is insufficient coolant in the system. This can lead to overheating of electronic components if not addressed.
• Check engine light on
• Overheating warning light
• Unusual noise from the coolant pump
• Low coolant level
• Faulty coolant pump
• Air in the coolant system
Coolant: A fluid used to keep the engine and other components from overheating.
Dry Run: When a pump operates without sufficient fluid, causing potential damage.
• Check coolant level and refill if necessary
• Inspect the coolant pump for proper operation
• Bleed the coolant system to remove air pockets
• Refill coolant to the correct level
• Replace faulty coolant pump
• Perform a coolant system bleed
• Coolant refill equipment
• Wrench set
• Diagnostic scan tool
$150 - $500
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regularly check coolant levels
• Schedule routine maintenance
• Inspect the coolant system for leaks
Cooling System Issue
• Do not ignore the warning lights
• Get the vehicle checked by a professional
• Avoid driving the vehicle if overheating occurs
Check with your vehicle manufacturer as some components may be covered under warranty.
This code has become more common with the increase in hybrid and electric vehicles, as they rely heavily on electronic cooling systems.
High – This issue can lead to overheating and damage to electronic components if not addressed promptly.
Driving with an overheating vehicle can be dangerous and lead to further damage. Address this issue as soon as possible.
• Vehicle must be running
• Check performed under normal operating temperature
The electronics coolant pump is typically located near the vehicle's radiator or cooling system components.
Q: Can I drive with a P2E46 code?
A: It's not recommended to drive with this code as it can lead to overheating and damage to the vehicle's electronics.
Q: How often should I check my coolant level?
A: It's a good practice to check your coolant level every few months or before long trips.
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.