What it means
Coolant pump E reports a control circuit/open condition. Coolant circulation through the affected loop cannot be commanded reliably.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Coolant pump E circulates coolant through a particular engine or auxiliary cooling loop; the letter E identifies this pump in the vehicle's control scheme. The controller monitors its control circuit and expects a complete electrical path when it commands the pump. This code sets when that path appears open, so the pump cannot be commanded reliably.
Common causes
Most likely first.
- Pump motor or driver fault
- Wiring or connector fault
- Pin pushed back out of connector body
Symptoms
- Check-engine light
- Coolant temperature warning or rising temperature gauge
- Reduced engine power
How to diagnose it
- Review freeze-frame data and coolant temperature readings to see whether temperature rose when pump E was commanded.
- With the engine cool, identify pump E using vehicle service information and inspect its connector for a loose plug or pushed-back pin.
- Trace pump E wiring for breaks, chafing, heat damage, or disconnected grounds and power feeds.
- Check the pump circuit for continuity and shorts using the manufacturer's wiring diagram and test procedure.
- Command pump E with a suitable scan tool and check for control activity and pump response.
- If wiring and connections pass, test the pump motor and driver against the manufacturer's specification.
Common fixes
- Seat the pump E connector and restore any pushed-back terminal.
- Repair an open, damaged wire or poor ground in the pump E circuit.
- Replace a failed pump E motor after confirming its supply and control circuits.
- Repair a faulty pump driver if the pump and wiring test correctly.
Can I keep driving?
If the temperature gauge rises or a coolant temperature warning appears, stop safely and switch off the engine to avoid overheating damage. If temperature stays normal, keep any trip short and gentle and monitor it closely.
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.