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 is saying that the part that helps control the engine's temperature is too hot.
The thermostat heater driver within the control module is experiencing a temperature that exceeds normal operating limits.
The P14F8 code indicates that the internal control module has detected an excessively high temperature in the thermostat heater driver circuit. This could be due to an electrical fault, excessive resistance, or a malfunction in the thermostat heater itself.
• Check Engine Light is on
• Engine overheating
• Poor engine performance
• Faulty thermostat heater
• Wiring issues in the thermostat circuit
• Malfunctioning control module
Thermostat: A device that regulates the temperature of a system.
Control Module: An electronic component that manages various functions in the vehicle.
• Use an OBD-II scanner to confirm the code.
• Inspect the thermostat and its wiring for damage.
• Test the thermostat heater resistance.
• Replace the thermostat heater if faulty.
• Repair or replace damaged wiring in the thermostat circuit.
• Replace the control module if necessary.
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $600
Moderate
• Chevrolet Cruze
• Buick Encore
• GMC Terrain
• Regular maintenance checks
• Ensure proper coolant levels
• Inspect wiring for signs of wear
Engine Performance
• Do not ignore the Check Engine Light.
• Avoid driving the vehicle if overheating occurs.
Check with your vehicle manufacturer for warranty coverage on engine components.
This code has been associated with thermostat issues in vehicles with electronic thermostat control systems.
High – Ignoring this issue can lead to severe engine damage due to overheating.
Driving with an overheating engine can cause safety hazards and legal issues if the vehicle becomes inoperable on the road.
• Engine at operating temperature
• Use of an OBD-II scanner
The thermostat is typically located near the engine block, connected to the radiator via hoses.
Q: Can I drive with a P14F8 code?
A: It's not recommended as it may lead to engine overheating and potential damage.
Q: How do I reset the Check Engine Light after repair?
A: Use an OBD-II scanner to clear the code after repairs are completed.
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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.
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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.
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Fitment Required · Vehicle-fitment part
Relevant when coolant-temperature and warm-up faults indicate a thermostat-related issue.
Coolant-temperature and warm-up faults often lead to thermostat testing and replacement.
Thermostats are vehicle-specific and should be matched by engine and housing style.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.