What it means
A control module has stopped receiving expected network messages from coolant pump C. The code indicates a communication fault; the effects depend on the vehicle's cooling system 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 C circulates coolant through a circuit identified by the vehicle maker, and its controller reports status over the vehicle network. A receiving module sets U062F when expected messages from pump C stop arriving; this code points to lost communication, not proof that the pump itself has failed.
Common causes
Most likely first.
- Bus wiring open or shorted
- Module without power or ground
- Module failed
Symptoms
- Warning light or message related to the affected system
- Cooling system may not operate as intended
How to diagnose it
- Save freeze-frame data and scan all modules for related communication, power, or cooling-system codes before clearing anything.
- Check live data for coolant pump C communication or status and note whether the fault is current or intermittent.
- Inspect pump C's network wiring and connectors for damage, corrosion, loose pins, or signs of coolant intrusion.
- Check the pump controller's power and ground connections using the vehicle wiring diagram and manufacturer's specifications.
- Test the network circuit for opens or shorts using the manufacturer's diagnostic procedure, then assess the pump controller only after wiring and supplies check out.
Common fixes
- Repair damaged or loose wiring and connector terminals in the pump C communication circuit.
- Clean or replace corroded pump C connector terminals and restore any compromised seals.
- Repair the pump controller's power or ground connection.
- Replace the pump C controller only if network wiring and power and ground are verified and the fault remains.
Can I keep driving?
Because the affected pump may serve a critical cooling circuit, avoid driving if a temperature warning appears, temperatures rise, or the vehicle limits power. Continued use could lead to overheating or loss of cooling; follow the vehicle's warning messages and stop safely if temperature rises.
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.