What it means
The engine coolant flow control valve reports a control circuit/open condition. Coolant routing between engine and radiator branches cannot be commanded as expected.
At a glance
- Usually lights the check-engine light
How it works
The coolant flow control valve routes coolant between engine and radiator branches, and its motor needs a complete control circuit to move. This code sets when the module detects an open in that circuit, such as a broken wire, an open motor, or a terminal pushed back in the connector.
Common causes
Most likely first.
- Open in valve control wire
- Open valve motor
- Pin pushed back out of connector body
Symptoms
- Check-engine light
- Engine takes longer to warm up or runs hotter than usual
- Temperature fluctuates or cabin heat is inconsistent
How to diagnose it
- Check freeze-frame data and coolant temperature live data for slow warm-up, overheating, or temperature fluctuation when the open was detected.
- With the engine cool, inspect the valve connector for a pushed-back pin, poor latch, corrosion, or moisture.
- Trace the valve control wiring for breaks, abrasion, or prior repairs, paying attention to sections that move or contact hot parts.
- Use a scan tool to command the valve, if supported, and check whether it responds while gently moving the harness to reveal an intermittent open.
- Test continuity through the control wiring and valve motor using the manufacturer's procedure to locate the open.
Common fixes
- Reseat the pushed-back terminal and secure the coolant valve connector.
- Repair an open or damaged control wire.
- Clean or repair corroded connector terminals.
- Replace the valve motor or assembly if testing confirms its winding is open.
Can I keep driving?
A short, gentle trip may be reasonable while the engine temperature stays normal, but keep watching the gauge because the valve may not route coolant correctly. Stop if it overheats; continued driving hot can cause severe engine damage.
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.