P0C4A:00 indicates the PCM is detecting a short to power, ground, or an open on the PWM output. The pump is controlled by a PWM signal giving it variable speed capability. This pump is for the battery coolant. It is located near the firewall on the left hand side of the motor. It is terminated at the PCM which is on the right hand side of the motor compartment, near the front. One of these might be loose, or have some contaminates inside. It could also be damaged wiring or a bad pump/pcm.
Check this pump, wire and plug.
I use translator. Sorry for the mistakes.