Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a pump in the car that helps keep the engine cool. It's like when a fan stops working and things start to get hot.
The code indicates that the Motor Electronics Coolant Pump B is not working properly, either stuck or stalled, which can affect the cooling of the engine's electronic components.
The Motor Electronics Coolant Pump B is responsible for circulating coolant to manage the temperature of the motor electronics. If this pump is stuck or stalled, it can lead to overheating of electronic components, potentially causing damage or reduced performance.
• Warning light on the dashboard
• Overheating of the engine
• Reduced engine performance
• Mechanical failure of the pump
• Electrical issues such as a blown fuse or faulty wiring
• Blockage in the coolant lines
Coolant: A fluid that circulates through the engine to remove excess heat.
Pump: A device that moves fluids or gases by mechanical action.
• Check for any diagnostic trouble codes (DTCs) and clear them.
• Inspect the coolant pump for physical damage or blockage.
• Test the electrical connections and wiring to the pump.
• Replace the faulty coolant pump.
• Repair or replace damaged wiring or connectors.
• Flush and clean the coolant system to remove blockages.
• OBD-II scanner
• Multimeter
• Coolant system pressure tester
$200 - $500
Moderate
• BMW 3 Series
• Audi A4
• Mercedes-Benz C-Class
• Regular maintenance of the cooling system
• Check coolant levels frequently
• Replace coolant at recommended intervals
Cooling System Issue
• Do not ignore the warning light; address the issue promptly.
• Consult a professional mechanic if unsure about the repair.
Check with the vehicle manufacturer for warranty coverage on cooling system components.
This code has been associated with vehicles that have advanced electronic cooling systems, particularly in high-performance or luxury models.
High – Overheating can cause significant damage to the engine and electronics.
Driving with an overheating engine can lead to severe damage and may void warranties.
• Engine running at operating temperature
• Ensure the cooling system is pressurized
The Motor Electronics Coolant Pump B is typically located near the engine block or the radiator.
Q: Can I drive my car with this code?
A: It's not recommended to drive with this code as it can lead to engine overheating.
Q: How often should the coolant pump be checked?
A: It should be checked during regular maintenance intervals or if any cooling system issues are suspected.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
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.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.