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 sensor that checks the temperature of the cooling liquid for the battery pack in a hybrid or electric vehicle.
The vehicle's control module has identified an issue with the electrical circuit related to the temperature sensor that monitors the coolant for the hybrid or electric vehicle's battery pack.
The P2E74 code indicates a malfunction in the circuit of the coolant temperature sensor D for the hybrid or electric vehicle's battery pack. This sensor is crucial for monitoring the temperature of the coolant, ensuring the battery operates within safe temperature limits. A fault in this circuit can lead to improper temperature readings, affecting battery performance and longevity.
• Check Engine Light is on
• Reduced battery performance
• Overheating of the battery pack
• Faulty coolant temperature sensor
• Damaged wiring or connectors
• Faulty control module
OBD-II: On-Board Diagnostics, a standardized system in vehicles for self-diagnosis and reporting.
Coolant: A fluid used to regulate temperature in a vehicle's engine or battery system.
• Use an OBD-II scanner to confirm the code
• Inspect the wiring and connectors for damage
• Test the coolant temperature sensor for proper operation
• Replace the faulty coolant temperature sensor
• Repair or replace damaged wiring or connectors
• Reprogram or replace the control module if necessary
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Toyota Prius
• Chevrolet Volt
• Nissan Leaf
• Regular maintenance checks
• Ensure proper coolant levels
• Inspect wiring and connectors periodically
Sensor Issue
• Avoid driving long distances until repaired
• Monitor battery performance closely
• Seek professional assistance
Check with manufacturer for warranty coverage on hybrid/EV components.
This code is relatively common in hybrid and electric vehicles, especially as they age and components wear out.
Moderate – Address promptly to avoid potential battery damage.
Ignoring this code may lead to reduced vehicle performance and potential safety issues due to battery overheating.
• Vehicle in a safe, stationary position
• Engine off and cooled down
The coolant temperature sensor is typically located near the battery pack or within the cooling system of the hybrid/EV vehicle.
Q: Can I drive my car with this code?
A: It's not recommended as it could lead to battery overheating and reduced performance.
Q: How often should I check my coolant system?
A: Regularly, as part of routine maintenance, or if you notice any performance issues.
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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.