P0CED: Hybrid/EV Electronics Coolant Pump A Enable Circuit

What it means

The hybrid electronics coolant pump A reports a enable circuit condition. Power electronics cooling may be impaired.

At a glance

• Usually lights the check-engine light
• The engine or gearbox may go into limp mode

How it works

Electronics coolant pump A circulates coolant through the hybrid or EV power electronics loop when its enable circuit allows operation. P0CED sets when the pump enable circuit has a fault, such as an open enable wire or a failed enable switch, so pump operation may not be allowed when requested.

Common causes

Most likely first.

1. Open in enable wire
2. Enable switch failed

Symptoms

• Hybrid or EV system warning light on
• Reduced power or limited vehicle operation
• Cooling-system warning may appear

How to diagnose it

1. Check freeze-frame data and scan-tool pump A command and enable status to see whether the fault occurs when the pump should be enabled.
2. With the vehicle powered down under the manufacturer's high-voltage safety procedure, inspect the enable circuit connector and harness for loose connections or visible damage.
3. Check the enable wire for an open circuit, using the manufacturer's wiring diagram to identify the correct circuit path.
4. Test the enable switch for the required switching behavior according to the manufacturer's procedure.
5. If the enable wire and switch pass, verify that the control module's enable command reaches pump A using the manufacturer's specified checks.

Common fixes

• Reconnect or secure a loose connection in the pump A enable circuit.
• Repair an open enable wire.
• Replace a failed pump enable switch.
• Repair the control-side fault identified by circuit testing.

Can I keep driving?

Avoid high loads and stop driving if a cooling warning or reduced power appears, since pump A may not be enabled to cool the power electronics. Arrange prompt diagnosis if the vehicle limits operation.