What it means
Coolant pump C 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 C circulates coolant through the part of the cooling system it serves. The control module checks whether the pump responds when commanded on; P2C48 sets when pump C appears not to operate as expected, including a mechanically stuck pump or a control driver that fails to run it.
Common causes
Most likely first.
- Pump motor mechanically stuck
- Output driver fault
- Carbon or debris buildup preventing free movement
Symptoms
- Check-engine light or coolant-system warning
- Engine or component temperatures running high
- Cooling fan running more often than usual
How to diagnose it
- Review freeze-frame data and live coolant temperatures and pump-command data to see when pump C was requested and whether temperatures rose.
- With the system cool, inspect pump C, its connector, and nearby wiring for damage, leaks, debris, or a disconnected plug.
- Use the vehicle's scan-tool output test, if available, to command pump C on and confirm whether it operates and coolant flow changes as expected.
- Check the pump C supply, ground, relay, and control-driver circuit against the wiring information and manufacturer's specification.
- If the electrical command reaches the pump but it does not respond, assess the pump for mechanical binding or debris using the specified procedure.
Common fixes
- Reconnect or repair a loose or damaged pump C connector or harness.
- Clear debris or buildup that is preventing pump C from turning, where serviceable.
- Repair a faulty pump C relay or control-driver circuit.
- Replace coolant pump C if it is mechanically stuck or fails its commanded operation test.
Can I keep driving?
Do not continue driving if the engine or the component cooled by pump C is overheating; stop safely and let it cool, as overheating can cause serious damage. If temperatures remain normal and no warning is active, drive only as needed while monitoring temperature 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.