What it means
The Coolant Pump A control circuit has a range or performance fault. The code does not by itself establish that the pump is commanded on, stopped, or that coolant temperature is rising.
At a glance
- Usually lights the check-engine light
How it works
Coolant Pump A circulates coolant when commanded by the control module. This performance or stuck-off code means the pump's operation does not meet expected checks; it does not alone confirm that the pump was commanded on or that the engine is overheating.
Common causes
Most likely first.
- Pump motor seized by debris or sediment
- Cracked rotor magnet decouples drive
- Carbon or debris buildup preventing free movement
Symptoms
- Check-engine light
- Possible engine overheating or reduced cooling, if the pump fault affects coolant circulation
How to diagnose it
- Review freeze-frame data and scan-tool pump command, status, and coolant-temperature data to determine whether Pump A was expected to run.
- Inspect Pump A's connector, wiring, and accessible coolant passages for damage, leaks, or visible obstruction.
- With the system cool, check the coolant level and condition, since low or contaminated coolant can affect circulation.
- Use an actuator test, if supported, and observe pump operation or circulation according to the manufacturer's service procedure.
- If power and command reach the pump but it does not operate correctly, test for a seized motor, damaged rotor magnet, or restricted rotor movement.
Common fixes
- Restore the specified coolant level and correct any leak found.
- Repair a loose or damaged Pump A connector or wire.
- Clear an obstruction or sediment only using the manufacturer's service procedure.
- Replace Pump A if its motor or rotor is seized or decoupled.
Can I keep driving?
Check the temperature gauge and warnings; if temperature rises or an overheating warning appears, stop safely and shut the engine off. Do not continue driving while overheating, since poor coolant circulation can damage the engine.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.