Enabling Conditions And Possible Causes Coolant Pumps

WARNING: This page is about a different variant/trim than selected.

MONITORING CONDITIONS
P0C73-00 MOTOR ELECTRONICS COOLANT PUMP "A" CONTROL PERFORMANCE	Continuous when the pump is commanded on. Ignition is in the Run position.
P0C74-00 MOTOR ELECTRONICS COOLANT PUMP "B" CONTROL PERFORMANCE	Continuous when the pump is commanded on. Ignition is in the Run position.
P1EA2-00 MOTOR ELECTRONICS COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	Continuous when the pump is commanded on. Ignition is in the Run position.
P1EA3-00 MOTOR ELECTRONICS COOLANT PUMP "B" TEMPERATURE SENSOR PERFORMANCE	Continuous when the pump is commanded on. Ignition is in the Run position.
P1EA4-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	Continuous when the pump is commanded on. Ignition is in the Run position.
P1EA5-00 COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	Continuous when the pump is commanded on. Ignition is in the Run position.
P2601-00 ELECTRIC COOLANT PUMP CONTROL CIRCUIT PERFORMANCE / STUCK OFF	Continuous when the pump is commanded on. Ignition is in the Run position.
P2B28-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" PERFORMANCE	Continuous when the pump is commanded on. Ignition is in the Run position.
P2B29-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" OVERSPEED / AIR IN SYSTEM	Continuous when the pump is commanded on. Ignition is in the Run position.
P2D01-00 MOTOR ELECTRONICS COOLANT PUMP "A" OVERSPEED / AIR IN SYSTEM	Continuous when the pump is commanded on. Ignition is in the Run position.
P2D06-00 MOTOR ELECTRONICS COOLANT PUMP "B" OVERSPEED / AIR IN SYSTEM	Continuous when the pump is commanded on. Ignition is in the Run position.
U0623-00 LOST COMMUNICATION WITH COOLANT PUMP "A"	Continuous when the pump is commanded on. Ignition is in the Run position.
U0646-00 LOST COMMUNICATION WITH MOTOR ELECTRONICS COOLANT PUMP "A"	Continuous when the pump is commanded on. Ignition is in the Run position.
U0647-00 LOST COMMUNICATION WITH MOTOR ELECTRONICS COOLANT PUMP "B"	Continuous when the pump is commanded on. Ignition is in the Run position.

FAULT SETTING CRITERIA
P0C73-00 MOTOR ELECTRONICS COOLANT PUMP "A" CONTROL PERFORMANCE	The Hybrid Control Processor (HCP) detects that the Low Temperature Coolant Pump 1 is not operating at the requested pump speed.
P0C74-00 MOTOR ELECTRONICS COOLANT PUMP "B" CONTROL PERFORMANCE	The Hybrid Control Processor (HCP) detects that the Low Temperature Coolant Pump 2 is not operating at the requested pump speed.
P1EA2-00 MOTOR ELECTRONICS COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	The Hybrid Control Processor (HCP) detects that the temperature sensor inside the Low Temperature Coolant Pump 1 is not providing expected temperature reading as compared with other temperature sensors.
P1EA3-00 MOTOR ELECTRONICS COOLANT PUMP "B" TEMPERATURE SENSOR PERFORMANCE	The Hybrid Control Processor (HCP) detects that the temperature sensor inside the Low Temperature Coolant Pump 2 is not providing expected temperature reading as compared with other temperature sensors.
P1EA4-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	The Hybrid Control Processor (HCP) detects that the temperature sensor inside the Battery Coolant Pump is not providing expected temperature reading as compared with other temperature sensors.
P1EA5-00 COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	The Hybrid Control Processor (HCP) detects that the High Temp Auxiliary Coolant Pump internal temperature sensor is faulted.
P2601-00 ELECTRIC COOLANT PUMP CONTROL CIRCUIT PERFORMANCE / STUCK OFF	The Hybrid Control Processor (HCP) detects that the High Temp Auxiliary Coolant Pump malfunction has been detected.
P2B28-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" PERFORMANCE	The Hybrid Control Processor (HCP) detects that the Battery Coolant Pump is not operating at the requested pump speed.
P2B29-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" OVERSPEED / AIR IN SYSTEM	The Hybrid Control Processor (HCP) detects that the Battery Coolant Pump has detected a dry run condition based on higher pump speed.
P2D01-00 MOTOR ELECTRONICS COOLANT PUMP "A" OVERSPEED / AIR IN SYSTEM	The Hybrid Control Processor (HCP) detects that the Low Temperature Coolant Pump 1 has detected a dry run condition based on higher pump speed.
P2D06-00 MOTOR ELECTRONICS COOLANT PUMP "B" OVERSPEED / AIR IN SYSTEM	The Hybrid Control Processor (HCP) detects that the Low Temperature Coolant Pump 2 has detected a dry run condition based on higher pump speed.
U0623-00 LOST COMMUNICATION WITH COOLANT PUMP "A"	The Hybrid Control Processor (HCP) detected loss of communication with the High Temp Auxiliary Pump over the LIN BUS.
U0646-00 LOST COMMUNICATION WITH MOTOR ELECTRONICS COOLANT PUMP "A"	The Hybrid Control Processor (HCP) detected loss of communication with the Low Temperature Coolant Pump 1 over the LIN BUS.
U0647-00 LOST COMMUNICATION WITH MOTOR ELECTRONICS COOLANT PUMP "B"	The Hybrid Control Processor (HCP) detected loss of communication with the Low Temperature Coolant Pump 2 over the LIN BUS.

DEFAULT AND LIMP-IN ACTIONS
P0C73-00 MOTOR ELECTRONICS COOLANT PUMP "A" CONTROL PERFORMANCE	Malfunction Indicator Lamp (MIL) on. Reduced thermal cooling performance. System torque is limited.
P0C74-00 MOTOR ELECTRONICS COOLANT PUMP "B" CONTROL PERFORMANCE	Malfunction Indicator Lamp (MIL) on. Reduced thermal cooling performance. System torque is limited. High Temp Aux Coolant Pump diagnostics are disabled. Heater request will be disabled.
P1EA2-00 MOTOR ELECTRONICS COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	Malfunction Indicator Lamp (MIL) on. Inverter coolant Temp sensor and Electronics Coolant Temp Sensor Range/Performance diagnostics will be disabled. System torque is limited.
P1EA3-00 MOTOR ELECTRONICS COOLANT PUMP "B" TEMPERATURE SENSOR PERFORMANCE	Malfunction Indicator Lamp (MIL) on. Switch to Low Temp Coolant Pump internal temperature performance readings.
P1EA4-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	Malfunction Indicator Lamp (MIL) on. Chiller and Heat exchanger diagnostics are disabled.
P1EA5-00 COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	Malfunction Indicator Lamp (MIL) on. Reduced thermal cooling performance. System torque is limited.
P2601-00 ELECTRIC COOLANT PUMP CONTROL CIRCUIT PERFORMANCE / STUCK OFF	Malfunction Indicator Lamp (MIL) on. Heater request will be disabled. Engine will turn on if heating is requested.
P2B28-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" PERFORMANCE	Malfunction Indicator Lamp (MIL) on.
P2B29-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" OVERSPEED / AIR IN SYSTEM	Malfunction Indicator Lamp (MIL) on. Disable EAC for battery cooling. Disable Battery Coolant Heater for Battery heating. System will enter thermal reduced performance if the battery temperature exceeds a calibrated limit.
P2D01-00 MOTOR ELECTRONICS COOLANT PUMP "A" OVERSPEED / AIR IN SYSTEM	Malfunction Indicator Lamp (MIL) on. Reduced thermal cooling performance. System torque is limited.
P2D06-00 MOTOR ELECTRONICS COOLANT PUMP "B" OVERSPEED / AIR IN SYSTEM	Malfunction Indicator Lamp (MIL) on. Reduced thermal cooling performance. System torque is limited.
U0623-00 LOST COMMUNICATION WITH COOLANT PUMP "A"	Malfunction Indicator Lamp (MIL) on. Reduced thermal cooling performance. System torque is limited.
U0646-00 LOST COMMUNICATION WITH MOTOR ELECTRONICS COOLANT PUMP "A"	Malfunction Indicator Lamp (MIL) on. Reduced thermal cooling performance. System torque is limited.
U0647-00 LOST COMMUNICATION WITH MOTOR ELECTRONICS COOLANT PUMP "B"	Malfunction Indicator Lamp (MIL) on.

POSSIBLE CAUSES
P0C73-00 MOTOR ELECTRONICS COOLANT PUMP "A" CONTROL PERFORMANCE	Low system voltage. LIN BUS communication DTCs. Low coolant in the Low Temperature Cooling Loop 1. Weak B+ feed to Low Temperature Coolant Pump 1. Weak Ground to Low Temperature Coolant Pump 1. Low Temperature Coolant Pump 1.
P0C74-00 MOTOR ELECTRONICS COOLANT PUMP "B" CONTROL PERFORMANCE	Low system voltage. LIN BUS communication DTCs. Low coolant in the Low Temperature Cooling Loop. Weak B+ feed to Low Temperature Coolant Pump 2. Weak Ground to Low Temperature Coolant Pump 2. Low Temperature Coolant Pump 2.
P1EA2-00 MOTOR ELECTRONICS COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	Low coolant in the Low Temperature Cooling Loop. Internal temperature sensor is open or shorted in the Low Temperature Coolant Pump 1. Low Temperature Coolant Pump 1.
P1EA3-00 MOTOR ELECTRONICS COOLANT PUMP "B" TEMPERATURE SENSOR PERFORMANCE	Low coolant in the Low Temperature Cooling Loop. Internal temperature sensor is open or shorted in the Low Temperature Coolant Pump 2. Low Temperature Coolant Pump 2.
P1EA4-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	Battery Pack Control Module (BPCM) inlet or outlet coolant temperature sensor DTCS present. Low coolant in the Battery Cooling Loop. Internal temperature sensor is open or shorted in the Battery Coolant Pump. Battery Coolant Pump.
P1EA5-00 COOLANT PUMP "A" TEMPERATURE SENSOR PERFORMANCE	Low coolant in the High Temperature Cooling Loop. Internal temperature sensor is open or shorted in the High Temperature Auxiliary Coolant Pump. High Temperature Auxiliary Coolant Pump.
P2601-00 ELECTRIC COOLANT PUMP CONTROL CIRCUIT PERFORMANCE / STUCK OFF	Low system voltage. Low coolant in the High Temperature Cooling Loop. Weak B+ feed to the High Temperature Auxiliary Coolant Pump. Weak Ground to High Temperature Auxiliary Coolant Pump. High Temperature Auxiliary Coolant Pump.
P2B28-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" PERFORMANCE	Low system voltage. LIN BUS communication DTCs. Low coolant in the Battery Cooling Loop. Weak B+ feed to the Battery Coolant Pump. Weak Ground to Battery Coolant Pump. Battery Coolant Pump.
P2B29-00 HYBRID / EV BATTERY PACK COOLANT PUMP "A" OVERSPEED / AIR IN SYSTEM	Low coolant in the Battery Cooling Loop. Air pockets in the Battery Cooling Loop. Restrictions in the Battery Cooling Loop.
P2D01-00 MOTOR ELECTRONICS COOLANT PUMP "A" OVERSPEED / AIR IN SYSTEM	Low coolant in the Low Temperature Cooling Loop. Air pockets in the Low Temperature Cooling Loop. Restrictions in the Low Temperature Cooling Loop.
P2D06-00 MOTOR ELECTRONICS COOLANT PUMP "B" OVERSPEED / AIR IN SYSTEM	Low coolant in the Low Temperature Cooling Loop. Air pockets in the Low Temperature Cooling Loop. Restrictions in the Low Temperature Cooling Loop.
U0623-00 LOST COMMUNICATION WITH COOLANT PUMP "A"	LIN Bus Circuit Open or shorted to the High Temperature Auxiliary Coolant Pump. Weak B+ feed to the High Temperature Auxiliary Coolant Pump. Weak Ground to High Temperature Auxiliary Coolant Pump. High Temperature Auxiliary Coolant Pump.
U0646-00 LOST COMMUNICATION WITH MOTOR ELECTRONICS COOLANT PUMP "A"	LIN Bus Circuit Open or shorted to the Low Temperature Coolant Pump 1. Weak B+ Feed to the Low Temperature Coolant Pump 1. Weak Ground to Low Temperature Coolant Pump 1. Low Temperature Coolant Pump 1.
U0647-00 LOST COMMUNICATION WITH MOTOR ELECTRONICS COOLANT PUMP "B"	LIN Bus Circuit Open or shorted to the Low Temperature Coolant Pump 2. Weak B+ Feed to the Low Temperature Coolant Pump 2. Weak Ground to Low Temperature Coolant Pump 2. Low Temperature Coolant Pump 2.