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Tahoe / Yukon Service Manual

DTC P0117-P0119, P2184-P2186, P2B2D, P2B2E, or P2BB5

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5898978 DTC P0117-P0119, P2184-P2186, P2B2D, P2B2E, or P2BB5 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 DTC P2184 Engine Coolant Temperature Sensor 2 Circuit Low DTC P2185 Engine Coolant Temperature Sensor 2 Circuit High DTC P2186 Engine Coolant Temperature Sensor 2 Circuit Erratic DTC P2B2D Engine Coolant Temperature Sensor 5 Circuit Low DTC P2B2E Engine Coolant Temperature Sensor 5 Circuit High DTC P2BB5 Engine Coolant Temperature Sensor 5 Circuit Erratic Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Signal — All P0117, P2184, P2B2D P0118, P2185, P2B2E P0118, P2185, P2B2E P0119, P2186, P2BB5
Low Reference — All — P0118, P2185, P2B2E * P0119, P2186, P2BB5
* Internal control module or component damage may occur if the circuit shorts to B+.

Typical Scan Tool Data Engine Coolant Temperature Sensor & Engine Coolant Temperature Sensor 2, 5 Short to Short to Circuit Ground Open Voltage Operating Conditions: Engine = Idling — At normal operating temperature.

Circuit Short to Ground Open Short to Voltage
Parameter Normal Range: 88 to 105°C (190 to 221°F)
Signal — All 140°C (284°F) −40°C (−40°F) −40°C (−40°F)
Low Reference — All — −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, P2184, P2B2D Ignition = On Frequency the DTC runs = Continuously — After the running conditions are met P0118, P2185, P2B2E 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, P2186, P2BB5 DTCs related to the following system/component = Not Set — B34 Engine Coolant Temperature Sensor — Circuit Engine = Running — For greater than 10 s Conditions for Setting the DTC P0117, P2184, P2B2D Engine Coolant Temperature = Warmer than 139°C (282°F) — For greater than 5 s P0118, P2185, P2B2E Engine Coolant Temperature = Colder than −59°C (−75°F) — For greater than 5 s P0119, P2186, P2BB5 Engine Coolant Temperature Sensor = Not within a calibrated range { Engine Coolant Temperature Sensor — For greater than 3.1 s } { Engine Coolant Temperature Sensor 2 — For greater than 7.4 s } { Engine Coolant Temperature Sensor 5 — For greater than 4.5 s } Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC Air Conditioning 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 Engine Coolant Temperature Sensor 2 Engine Coolant Temperature Sensor 5

Component Location
B34A Engine Coolant Temperature Sensor 1 Engine Coolant Inlet Pipe
B34B Engine Coolant Temperature Sensor 2 Engine Block — Front
B34E Engine Coolant Temperature Sensor 5 Engine Block — Rear

Reference Information Schematic Reference Engine Controls Schematics Engine Heating/Cooling 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

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify the following scan tool parameters are within the specified range: −39 to 139°C (−38 to 282°F) Engine Coolant Temperature Sensor Engine Coolant Temperature Sensor 2 Engine Coolant Temperature Sensor 5 ⇒ If not in the specified range Refer to: Circuit/System Testing ⇓ If in the specified range
  3. Verify the scan tool parameter: Engine Coolant Temperature Sensor = The value should not spike or drop out. Engine Coolant Temperature Sensor 2 = The value should not spike or drop out. Engine Coolant Temperature Sensor 5 = 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: @ 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
  4. 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
  5. All OK. Circuit/System Testing
  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the appropriate electrical connector: B34 Engine Coolant Temperature Sensor
  3. 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
  4. Ignition » On / Vehicle » In Service Mode
  5. Verify the appropriate 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)
  6. Connect a 3 A fused jumper wire between the test points: Signal circuit terminal 1 & Low Reference circuit terminal 2
  7. Verify the appropriate scan tool parameter: Engine Coolant Temperature Sensor = Warmer than 139°C (282°F) ⇒ If 139°C (282°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 139°C (282°F)
  8. Replace the appropriate component: B34 Engine Coolant Temperature Sensor Component Testing
  9. Ignition/Vehicle » Off
  10. Disconnect the appropriate electrical connector: B34 Engine Coolant Temperature Sensor
  11. Test the resistance between the test points: Signal circuit terminal 1 & Low Reference circuit terminal 2 @ Component
  12. Verify the value is within the range listed in the table: Temperature Versus Resistance ⇒ If not in the specified range Replace the appropriate component: B34 Engine Coolant Temperature Sensor ⇓ If in the specified range
  13. Test for infinite resistance between the test points: Each terminal of the component & The component’s housing ⇒ If less than infinite resistance Replace the appropriate component: B34 Engine Coolant Temperature Sensor ⇓ If infinite resistance
  14. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Engine Coolant Temperature Sensor Replacement - Water Pump Inlet Pipe — B34A Engine Coolant Temperature Sensor 1 — Water Pump Inlet Pipe Engine Coolant Temperature Sensor Replacement - Engine Block - Front — B34B Engine Coolant Temperature Sensor 2 — Engine Block — Front Engine Coolant Temperature Sensor Replacement - Engine Block - Rear — B34E Engine Coolant Temperature Sensor 5 — Engine Block — Rear For control module replacement, programming, and setup refer to: Control Module References