What it means
Coolant pump E is commanded on but does not respond as expected. Pump motor stuck, relay weld, or driver fault.
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 vehicle cooling circuit, which may support engine, hybrid, or other components depending on the vehicle. P2D26 sets when the control module commands pump E on but detects that it is stuck off or its response does not meet expectations.
Common causes
Most likely first.
- Pump motor mechanically stuck
- Output driver fault
- Carbon or debris buildup preventing free movement
Symptoms
- Check-engine or hybrid-system warning
- Power limited warning
- Reduced performance under load
How to diagnose it
- Read freeze-frame data and pump E command and status with a scan tool to confirm the fault occurred while the pump was requested to run.
- Check coolant level and inspect pump E, its hoses, and nearby wiring for leaks, damage, or a disconnected plug.
- With the vehicle safely powered as required, confirm whether pump E operates when commanded and listen or feel for signs that its motor is stalled.
- Inspect pump E's electrical connector, fuse, relay, and wiring for corrosion, overheating, opens, or poor connections.
- Test pump E's control circuit and motor operation against the manufacturer's specification to distinguish a stuck pump from a driver fault.
Common fixes
- Reconnect or repair loose or damaged wiring at pump E.
- Replace a failed fuse or relay after checking for the cause of failure.
- Clear debris or contamination only if the manufacturer's procedure allows service of pump E.
- Replace pump E if it remains mechanically stuck or fails its electrical test.
- Repair the control module output circuit if testing identifies a driver fault.
Can I keep driving?
Avoid hard driving and heavy loads because reduced coolant circulation can cause overheating or force the vehicle to limit power. If a temperature warning appears or the vehicle reports a hybrid-system fault, stop safely and follow the vehicle's warning instructions.
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.