Faulty Auxiliary Coolant Pump Control Module
Auxiliary Coolant Pump Control Module harness is open or shorted
Auxiliary Coolant Pump Control Module circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the Auxiliary Coolant Pump Control Signal Message Counter is Incorrect.