P0118
DTC P0117, P0118, or P0119
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0117
- Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage
DTC P0118
- Engine Coolant Temperature (ECT) Sensor Circuit High Voltage
DTC P0119
- Engine Coolant Temperature (ECT) Sensor Circuit Intermittent
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 V to the ECT sensor signal circuit and a ground for the low reference circuit.
Conditions for Running the DTC
P0117 and P0118
* The ignition is ON, or the engine is running.
* This DTC runs continuously within the enabling conditions.
P0119
* The ignition is ON, or the engine is running.
* DTC P0117 or P0118 are not set
Conditions for Setting the DTC
P0117
The ECM detects a short to ground in the ECT signal circuit or the ECT sensor.
P0118
The ECM detects a short to high or open in the ECT signal circuit or the ECT sensor
P0119
The ECM detects that the ECT sensor signal has abruptly changed by a minimum of 5°C (9°F), warmer or colder for greater than 2 s.
Action Taken When the DTC Sets
* DTCs P0117, P0118 and P0119 are Type B DTCs
* The cooling fans will be commanded ON.
* The A/C compressor will be commanded OFF.
Conditions for Clearing the DTC
DTCs P0117, P0118 and P0119 are Type B DTCs
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1 A4
Description and Operation
Cooling System Description and Operation Description and Operation
Hybrid Modes of Operation Description Hybrid Modes of Operation Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, engine running, observe the scan tool ECT Sensor parameter. The reading should be between -39 to +139°C (-38 to +282°F).
2. Engine idling, observe the scan tool ECT Sensor parameter while moving the related wiring harness and harness connectors. The reading should not change abruptly.
• If the reading changes abruptly, repair the wiring harness or the harness connectors.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the engine coolant temperature sensor.
2. Ignition OFF, all vehicle systems OFF. This may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm between the low reference circuit terminal 2 and ground.
• If warmer than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
3. Service Mode active, verify the scan tool ECT Sensor is colder than -39°C (-38.2°F).
• If less than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K20 engine control module.
4. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool ECT Sensor is warmer than 149°C (300°F).
• If colder than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
5. If all circuits test normal, test or replace the B34A engine coolant temperature sensor.
Component Testing
Static Test
1. Ignition off, remove the engine coolant temperature sensor.
Note: A thermometer can be used to test the sensor off vehicle.
2. Test the B34 Engine Coolant Temperature Sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature Versus Resistance Temperature Versus Resistance table and verify that the resistance is within 5% of the specification.
• If not within the specified range, replace the B34 engine coolant temperature sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Engine Coolant Temperature Sensor Replacement (Water Outlet) Engine Coolant Temperature Sensor Replacement (Water Outlet)Engine Coolant Temperature Sensor Replacement (Thermostat) Engine Coolant Temperature Sensor Replacement (Thermostat)
* Control Module References Control Module References for ECM replacement, setup, and programming