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 thinks there's a problem with how a special pump, which helps keep the car's electric parts cool, is working.
The P0C74 code is triggered when the vehicle's control module detects an issue with the performance of the motor electronics coolant pump B. This pump is responsible for circulating coolant to maintain optimal temperature for the motor electronics.
The motor electronics coolant pump B is a critical component in hybrid and electric vehicles, responsible for maintaining the temperature of the motor electronics by circulating coolant. The control module monitors the pump's performance and sets the P0C74 code if it detects a deviation from expected performance parameters, which could indicate a malfunction or inefficiency in the pump's operation.
• Check engine light on
• Overheating of motor electronics
• Reduced vehicle performance
• Faulty coolant pump B
• Electrical connection issues
• Control module malfunction
Coolant: A fluid that absorbs heat from the engine and dissipates it through the radiator.
OBD-II: On-Board Diagnostics, a standardized system in vehicles for self-diagnosing and reporting.
• Use an OBD-II scanner to confirm the code.
• Inspect the electrical connections to the coolant pump.
• Test the coolant pump for proper operation.
• Replace the faulty coolant pump B.
• Repair or replace damaged electrical connections.
• Reprogram or replace the control module if necessary.
• OBD-II scanner
• Multimeter
• Coolant pump replacement tools
$200 - $600
Moderate
• Toyota Prius
• Chevrolet Volt
• Ford Fusion Hybrid
• Regular maintenance of the cooling system
• Check electrical connections periodically
• Use manufacturer-recommended coolant
Engine Performance
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult with a professional mechanic for accurate diagnosis.
Check with the vehicle manufacturer for warranty coverage on hybrid components.
This code has become more common as hybrid and electric vehicles have increased in popularity, highlighting the importance of maintaining cooling systems in these vehicles.
High – This issue should be addressed promptly to avoid potential damage to the motor electronics.
Driving with this code may cause overheating, leading to potential safety risks and further damage to the vehicle.
• Vehicle at operating temperature
• Coolant system fully filled and free of air pockets
The motor electronics coolant pump B is typically located near the motor or battery pack, depending on the vehicle design.
Q: Can I drive with a P0C74 code?
A: It's not recommended to drive with this code active, as it can lead to overheating and damage.
Q: How can I prevent this code from appearing?
A: Regular maintenance of the cooling system and checking electrical connections can help prevent this issue.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
View on Amazon
Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
View on Amazon
Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.