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 heater that helps keep the hybrid or electric car's battery at the right temperature. It's like when your room heater isn't working properly and your room gets too cold.
The P0E17 code indicates that there is a low voltage condition in the control circuit for the second coolant heater in a hybrid or electric vehicle's battery pack.
The hybrid or electric vehicle's battery pack requires a coolant heater to maintain optimal operating temperatures. The control circuit for this heater is monitored by the vehicle's computer. If the voltage is lower than expected, the P0E17 code is triggered, indicating a potential issue with the heater circuit, wiring, or control module.
• Check Engine Light illuminated
• Reduced battery performance
• Possible overheating of the battery pack
• Faulty battery pack coolant heater
• Damaged wiring or connectors in the heater circuit
• Defective control module
Coolant Heater: A device that helps maintain the temperature of the battery pack.
Control Circuit: The electrical circuit that manages the operation of the heater.
• Use a scan tool to verify the code and check for other related codes.
• Inspect the wiring and connectors for damage or corrosion.
• Test the coolant heater for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty battery pack coolant heater.
• Replace or reprogram the control module if necessary.
• OBD-II scan tool
• Multimeter
• Basic hand tools
$200 - $800
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regular maintenance checks of the cooling system.
• Ensure proper coolant levels and quality.
• Inspect wiring and connectors periodically.
Sensor Issue
• Avoid driving the vehicle until the issue is diagnosed and repaired.
• Consult with a qualified hybrid/EV technician.
Check with your vehicle manufacturer for warranty coverage on hybrid/EV components.
This code has been reported in various hybrid and electric vehicles, often related to issues with the battery cooling system.
Moderate – Addressing this issue promptly can prevent battery damage.
Driving with this issue may lead to reduced vehicle performance and potential battery damage.
• Vehicle at operating temperature
• Battery management system active
The battery pack coolant heater is typically located near or integrated with the battery pack, often under the vehicle or in the trunk area.
Q: Can I drive my car with a P0E17 code?
A: It's not recommended to drive with this code as it may cause battery performance issues.
Q: What happens if I ignore the P0E17 code?
A: Ignoring this code could lead to battery overheating and reduced performance.
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.