DTC P0117, P0118, or P0119

Engine Controls and Fuel - 5.3L L84 or 6.2L L87 | Diagnostic Information and Procedures | Document ID: 5411623 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P0117 Engine Coolant Temperature Sensor Circuit Low DTC P0118 Engine Coolant Temperature Sensor Circuit High DTC P0119 Engine Coolant Temperature Sensor Circuit Erratic Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performanc
Signal	P0117, P0119	P0118, P0119	P0118*, P0119	P0119, P0128
Low Reference	—	P0118, P0119**	*	P0119, P0128
* Internal control module or component damage may occur if the circuit shorts to B+. ** Additional DTCs may set

Typical Scan Tool Data Engine Coolant Temperature Sensor

Circuit	Short to Ground	Open	Short to Voltage
Operating Conditions: Engine = Idling — At normal operating temperature. Parameter Normal Range: 88 to 105°C (190 to 221°F)
Signal	150°C (302°F)	−40°C (−40°F)	−40°C (−40°F)
Low Reference	—	−40°C (−40°F)	—

Circuit/System Description For an overview of the component/system, refer to: Cooling System Description and Operation

Circuit	Description
Signal	The control module input circuit has an internal resistance connected to 5 V.
Low Reference	Grounded through the control module.

Component	Description
B34 Engine Coolant Temperature Sensor	The sensor is a negative temperature coefficient thermistor. As the temperature of the air, fluid, or metal increases, the resistance of the sensor decreases, varying the voltage on the signal circuit.
K20 Engine Control Module	The control module contains a microprocessor used to process input data to control outputs. The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.

Conditions for Running the DTC P0117 Ignition = On Frequency the DTC runs = Continuously — After the running conditions are met P0118 Engine = Running — For greater than 10 s Intake Air Temperature Sensor = Warmer than −20°C (−4°F) Frequency the DTC runs = Continuously — After the running conditions are met P0119 DTC P0117, P0118 = Not set Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC P0117 Engine Coolant Temperature = Warmer than 149°C (300°F) — For greater than 5 s P0118 Engine Coolant Temperature = Colder than −39°C (−38°F) — For greater than 5 s P0119 Engine Coolant Temperature = Intermittent — For greater than 5 s Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC A/C Compressor = Off Cooling Fan = On Engine Coolant Temperature — Gauge = Inoperative Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B DTC Diagnostic Aids After starting a cold engine, the following scan tool parameter value should rise steadily and then stabilize: Engine Coolant Temperature Sensor Reference Information Schematic Reference Engine Controls Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

Ignition » On / Vehicle » In Service Mode
Verify the scan tool parameter: Engine Coolant Temperature Sensor = −39 to 149°C (−38 to 300°F) ⇒ If not between −39 and 149°C (−38 and 300°F) Refer to: Circuit/System Testing ⇓ If between −39 and 149°C (−38 and 300°F)
Verify the scan tool parameter: Engine Coolant Temperature Sensor = The value should not spike or drop out. Perform the action while monitoring the parameter: Wiggle the harness and connector: B34 Engine Coolant Temperature Sensor Wiggle the harness and connector: X2 @ K20 Engine Control Module Wiggle the harness and connector: X3 @ K20 Engine Control Module ⇒ If the value spikes or drops out Repair as necessary » Wiring / Terminal(s) / Electrical Connector(s) ⇓ If the value does not spike or drop out
Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Verify the DTC does not set. ⇒ If the DTC sets Refer to: Circuit/System Testing ⇓ If the DTC is not set
All OK. Circuit/System Testing

Ignition/Vehicle & All vehicle systems » Off
Disconnect the electrical connector: B34 Engine Coolant Temperature Sensor
Test for less than 10 Ω between the test points: Low Reference circuit terminal 2 & Ground ⇒ If 10 Ω or greater 3.1. Disconnect the appropriate electrical connector: K20 Engine Control Module 3.2. Test for less than 2 Ω between the test points: Low Reference circuit terminal 2 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇓ If less than 10 Ω
Ignition » On / Vehicle » In Service Mode
Verify the scan tool parameter: Engine Coolant Temperature Sensor = Colder than −39°C (−38°F) ⇒ If −39°C (−38°F) or warmer 5.1. Ignition/Vehicle » Off 5.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 5.3. Test for infinite resistance between the test points: Signal circuit terminal 1 @ Component harness & Ground ⇒ If less than infinite resistance » Repair the short to ground on the circuit. ⇒ If infinite resistance » Replace the component: K20 Engine Control Module ⇓ If colder than −39°C (−38°F)
Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Low Reference circuit terminal 2
Verify the scan tool parameter: Engine Coolant Temperature Sensor = Warmer than 149°C (300°F) ⇒ If 149°C (300°F) or colder 7.1. Ignition/Vehicle » Off & Remove » Jumper wire(s) 7.2. Disconnect the appropriate electrical connector: K20 Engine Control Module 7.3. Ignition » On / Vehicle » In Service Mode 7.4. Test for less than 1 V between the test points: Signal circuit terminal 1 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V 7.5. Ignition/Vehicle » Off 7.6. Test for less than 2 Ω between the test points: Signal circuit terminal 1 @ Component harness & The other end of the circuit @ Control module harness ⇒ If 2 Ω or greater » Repair the open/high resistance in the circuit. ⇒ If less than 2 Ω » Replace the component: K20 Engine Control Module ⇓ If warmer than 149°C (300°F)
Test or replace the component: B34 Engine Coolant Temperature Sensor Component Testing
Ignition/Vehicle » Off
Disconnect the electrical connector: B34 Engine Coolant Temperature Sensor
Test for 42 to 78,834 Ω between the test points: Signal terminal 1 & Low Reference terminal 2 ⇒ If not between 42 and 78,834 Ω Replace the component: B34 Engine Coolant Temperature Sensor ⇓ If between 42 and 78,834 Ω
Verify the value is within the range listed in the table: Temperature Versus Resistance - Engine Coolant Temperature Sensor ⇒ If not in the specified range Replace the component: B34 Engine Coolant Temperature Sensor ⇓ If in the specified range
Test for infinite resistance between the test points: Each terminal of the component & The component’s housing ⇒ If less than infinite resistance Replace the component: B34 Engine Coolant Temperature Sensor ⇓ If infinite resistance
All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Engine Coolant Temperature Sensor Replacement For control module replacement, programming, and setup refer to: Control Module References