What it means
Communication with coolant pump F has been lost. The code identifies a communication fault; the pump’s function and the vehicle’s response depend on the vehicle design.
At a glance
- Usually lights the warning light of the system that lost communication
- The engine or gearbox may go into limp mode
How it works
Coolant pump F moves coolant through the vehicle circuit assigned to it by the manufacturer. This code sets when communication with pump F is lost over the vehicle bus, leaving the control system unable to confirm or reliably command that pump; the affected cooling function varies by vehicle.
Common causes
Most likely first.
- Bus wiring open or shorted
- Module without power or ground
- Module failed
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Record freeze-frame data and scan all modules for pump, temperature, and communication codes to identify the circuit served by pump F.
- Review live data for pump F’s communication status and any available command, feedback, or related circuit temperature.
- Inspect pump F’s connector and bus wiring for corrosion, loose pins, chafing, or heat damage.
- Verify the pump’s specified power and ground, since a supply problem can make its controller stop responding.
- Test the communication wires for an open or short using the vehicle wiring diagram and manufacturer procedures.
- If the circuit and supply are sound, check whether pump F’s module has failed.
Common fixes
- Reconnect or clean pump F’s connector.
- Repair damaged or shorted bus wiring to pump F.
- Restore the pump module’s power or ground.
- Replace coolant pump F if the wiring and supply are sound and the module is faulty.
Can I keep driving?
Stop driving if the vehicle shows overheating or a temperature warning, because pump F may serve a cooling circuit needed to protect components. Without such warnings, limit driving and have the communication fault checked promptly.
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.