Engine Coolant Temperature Sensors
The Engine Coolant Temperature Sensor (CTS or ECT) uses electrical resistance to measure the temperature of the coolant/antifreeze mixture in the cooling system. This gives an indication of how much heat the engine is giving off. The vehicle’s computer will use this information to adjust certain engine functions to keep engine temperature at an ideal level. It may turn the cooling fan off or on, open the exhaust gas recirculation or communicate the need for a richer fuel mixture.
Common causes of Engine Coolant Temperature Sensor failure include:
• Faulty wiring
• Loose or corroded connectors
Symptoms of a failing Engine Coolant Temperature Sensor may include:
• Reduced fuel efficiency
• Poor start
• Black smoke coming from vehicle’s exhaust
• Overheating engine
• Poor idle (necessary to pump the gas pedal to keep vehicle running)
• Check Engine Light on
The following OBD II error codes are the most commonly found with this product type. In an effort to reduce vehicle emissions, the Environmental Protection Agency (EPA), mandated that all vehicles manufactured after 1996 would be equipped with OBD II (On Board Diagnostics 2) technology. OBD II is now the standard in diagnosing vehicle emissions, which was implemented by all automotive manufacturers in 1996. The codes listed for this product type are common instances that may relate to your vehicle and should be used as a guide only. Walker Products will not be held responsible for any use of this information. It is highly suggested that you consult with a professionally trained mechanic prior to any automotive repair, and that you follow all vehicle manufacturer and EPA guidelines for removal, replacement, diagnostics, OBD II code clearing, ECU, and PCM relearn procedures.
o P008F Engine Coolant Temperature/Fuel Temperature Correlation
o P00B1 Radiator Coolant Temperature Sensor Circuit
o P00B2 Radiator Coolant Temperature Sensor Circuit Range/Performance
o P00B3 Radiator Coolant Temperature Sensor Circuit Low
o P00B4 Radiator Coolant Temperature Sensor Circuit High
o P00B5 Radiator Coolant Temperature Sensor Circuit Intermittent/Erratic
o P00B6 Radiator Coolant Temperature/Engine Coolant Temperature
o P0115 Engine Coolant Temperature Sensor 1 Circuit
o P0116 Engine Coolant Temperature Sensor 1 Circuit Range/Performance
o P0117 Engine Coolant Temperature Sensor 1 Circuit Low
o P0118 Engine Coolant Temperature Sensor 1 Circuit High
o P0119 Engine Coolant Temperature Sensor 1 Circuit Intermittent
o P011A Engine Coolant Temperature Sensor 1/2 Correlation
o P011B Engine Coolant Temperature/Intake Air Temperature Correlation
o P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
o P0126 Insufficient Coolant Temperature for Stable Operation
o P0128 Coolant Thermostat (Coolant Temperature Below Thermostat
o P050C Cold Start Engine Coolant Temperature Performance
o P060F Internal Control Module Coolant Temperature Performance
o P063F Auto Configuration Engine Coolant Temperature Input not Present
o P0A00 Motor Electronics Coolant Temperature Sensor Circuit
o P0A02 Motor Electronics Coolant Temperature Sensor Circuit Low
o P0A03 Motor Electronics Coolant Temperature Sensor Circuit High
o P0A04 Motor Electronics Coolant Temperature Sensor Circuit Intermittent
o P0C42 Hybrid Battery Pack Coolant Temperature Sensor Circuit
o P0C43 Hybrid Battery Pack Coolant Temperature Sensor Circuit
o P0C44 Hybrid Battery Pack Coolant Temperature Sensor Circuit Low
o P0C45 Hybrid Battery Pack Coolant Temperature Sensor Circuit High
o P0C46 Hybrid Battery Pack Coolant Temperature Sensor Circuit
o P2182 Engine Coolant Temperature Sensor 2 Circuit
o P2183 Engine Coolant Temperature Sensor 2 Circuit Range/Performance
o P2184 Engine Coolant Temperature Sensor 2 Circuit Low
o P2185 Engine Coolant Temperature Sensor 2 Circuit High
o P2186 Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic
o U0116 Lost Communication With Coolant Temperature Control Module
o U0456 Invalid Data Received From Coolant Temperature Control Module