What it means
Coolant pump E reports a control circuit low 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 its assigned cooling loop. The controller monitors the pump E control circuit and sets this code when the circuit signal is lower than expected, which can prevent reliable pump operation. Corroded terminals, wiring faults, or a failed pump or driver can pull the signal low.
Common causes
Most likely first.
- Pump motor or driver fault
- Wiring or connector fault
- Connector pins corroded - high contact resistance
Symptoms
- Check-engine light
- Coolant temperature warning or rising temperature gauge
- Reduced engine power
How to diagnose it
- Check freeze-frame data and live coolant temperatures for evidence that the pump E loop was heating when the low-circuit fault appeared.
- With the engine cool, inspect pump E's connector and terminals for corrosion, moisture, looseness, or damaged seals.
- Inspect the circuit wiring and grounds for chafing, shorts to ground, or damaged insulation.
- Measure circuit voltage and voltage drop while pump E is commanded, following the manufacturer's test procedure.
- Command pump E with a scan tool and compare its response and feedback with the expected operation.
- If connector and wiring checks pass, test the pump motor and control driver to the manufacturer's specification.
Common fixes
- Clean and secure corroded or loose pump E terminals, replacing damaged terminals as needed.
- Repair wiring or ground faults that pull the control circuit low.
- Replace pump E if it fails motor or commanded-operation testing.
- Repair or replace a failed control driver if the pump and circuit are serviceable.
Can I keep driving?
A rising temperature gauge or coolant warning calls for stopping safely and switching off the engine; continued driving can overheat and damage it. If temperature is normal, limit driving and monitor it closely until the pump circuit is repaired.
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.