Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car has a special pump to keep the motor cool. This code means the pump stopped working because it got too hot.
The code indicates that the coolant pump for Drive Motor 'A' has shut down due to excessive internal temperature.
This diagnostic trouble code (DTC) is triggered when the internal temperature of the drive motor 'A' coolant pump exceeds the threshold, causing the pump to cut off to prevent damage. The cooling system is crucial for maintaining optimal operating temperatures of the electric drive motor.
• Warning light on dashboard
• Reduced vehicle performance
• Overheating of drive motor
• Faulty coolant pump
• Blocked coolant passages
• Cooling system leaks
Coolant: A fluid that absorbs heat to keep the engine or motor from overheating.
Drive Motor: An electric motor that provides propulsion for the vehicle.
• Check for any visible coolant leaks.
• Inspect the coolant pump for signs of damage.
• Verify coolant flow and check for blockages.
• Replace the coolant pump if faulty.
• Clear any blockages in the cooling system.
• Repair any leaks in the coolant system.
• OBD-II scanner
• Coolant system pressure tester
• Basic hand tools
$150 - $400
Moderate
• Chevrolet Volt
• Nissan Leaf
• Toyota Prius
• Regularly check coolant levels.
• Ensure the cooling system is serviced as per the manufacturer's schedule.
• Inspect for leaks periodically.
Cooling System Issue
• Do not drive the vehicle if the warning light is on.
• Have the vehicle inspected by a professional as soon as possible.
Check with the vehicle manufacturer for warranty coverage on cooling system components.
This code has become more common with the rise of electric and hybrid vehicles, which rely on electric motor cooling systems.
High – Continued driving can lead to motor damage.
Driving with this issue can cause severe damage to the electric motor, potentially leading to costly repairs.
• Engine running
• Vehicle at operating temperature
The drive motor coolant pump is typically located near the electric drive motor, often at the front of the vehicle.
Q: Can I drive with a P1B5D code?
A: It's not recommended to drive with this code active as it may lead to motor damage.
Q: How do I reset the P1B5D code?
A: After repairs, use an OBD-II scanner to clear the code, but ensure the issue is resolved first.
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.
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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.
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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.