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 pump that helps cool down the car's electric motor is running without any coolant, which is like trying to drink from an empty cup.
The Drive Motor 'A' Coolant Pump is responsible for circulating coolant to keep the electric motor at a safe operating temperature. A 'dry run' means the pump is operating without coolant, which can cause overheating.
The P1B5E code is triggered when the vehicle's control module detects that the Drive Motor 'A' Coolant Pump is running without sufficient coolant. This condition can lead to inadequate cooling of the drive motor, potentially causing overheating and damage.
• Check engine light on
• Overheating warning light
• Reduced vehicle performance
• Low coolant level
• Coolant leak
• Faulty coolant pump
Coolant: A fluid that absorbs heat from the engine and dissipates it through the radiator.
Dry Run: Operation of a pump without any fluid, which can cause damage.
• Check coolant level and top up if necessary.
• Inspect for any visible coolant leaks.
• Test the operation of the coolant pump.
• Refill the coolant to the recommended level.
• Repair any identified coolant leaks.
• Replace the coolant pump if it is faulty.
• Coolant pressure tester
• Coolant refill tool
• Basic hand tools
$150 - $500
Moderate
• Chevrolet Volt
• Nissan Leaf
• Toyota Prius
• Regularly check coolant levels.
• Inspect for leaks during routine maintenance.
• Ensure the coolant pump is functioning properly.
Cooling System Issue
• Do not ignore the check engine light.
• Avoid driving the vehicle if it shows signs of overheating.
Check with the vehicle manufacturer for warranty coverage on cooling system components.
This code has become more common with the increase in electric and hybrid vehicles, which rely heavily on efficient cooling systems.
High – Driving with this issue can lead to overheating and severe damage to the electric motor.
Ignoring this code can lead to vehicle damage and potential safety hazards due to overheating.
• Engine running
• Coolant system pressurized
The Drive Motor 'A' Coolant Pump is typically located near the electric motor, within the engine bay.
Q: Can I drive with a P1B5E code?
A: It's not recommended to drive with this code as it can lead to overheating and damage.
Q: How do I know if my coolant pump is working?
A: You can listen for the pump's operation or check for coolant circulation in the reservoir.
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