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 reading the temperature of a part that helps convert power to different parts of the car. It's like when a thermometer isn't working right, and you can't tell if it's hot or cold.
The vehicle's Powertrain Control Module (PCM) has detected an issue with the temperature sensor in the DC/DC converter, which is responsible for maintaining the correct voltage levels in the vehicle's electrical system.
The DC/DC converter temperature sensor monitors the temperature of the converter to ensure it operates within the specified range. If the PCM detects a signal from this sensor that is outside the expected range, it triggers the P0C39 code.
• Check Engine Light illuminated
• Possible electrical system malfunctions
• Reduced fuel efficiency
• Faulty DC/DC converter temperature sensor
• Wiring issues or poor connections
• Faulty DC/DC converter
DC/DC Converter: A device that converts direct current (DC) from one voltage level to another.
PCM: Powertrain Control Module, the vehicle's main computer that controls engine and transmission functions.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors to the DC/DC converter temperature sensor.
• Test the sensor for proper operation using a multimeter.
• Replace the DC/DC converter temperature sensor.
• Repair or replace damaged wiring or connectors.
• Replace the DC/DC converter if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regular maintenance of electrical systems
• Ensure good connections and wiring integrity
• Monitor for unusual electrical behavior
Sensor Issue
• Have a professional diagnose the issue to avoid further electrical problems.
• Avoid ignoring the Check Engine Light as it may lead to more serious issues.
Check with your vehicle manufacturer as some components may be covered under warranty.
This code is more common in hybrid or electric vehicles due to the complexity of their electrical systems.
Moderate – While the vehicle may still operate, it's important to address this issue to prevent further electrical problems.
Driving with an unresolved issue in the electrical system may lead to safety concerns or vehicle malfunction.
• Engine running
• Vehicle at operating temperature
The DC/DC converter is typically located in the engine compartment or near the battery pack in hybrid/electric vehicles.
Q: Can I drive my car with a P0C39 code?
A: It's possible to drive, but it's not recommended as it may lead to electrical issues.
Q: How can I reset the Check Engine Light?
A: You can use an OBD-II scanner to reset the light, but it's important to fix the underlying issue first.
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.