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Tahoe / Yukon Service Manual

DTC P017B-P017D, P117F, P14C0, or P2C3A-P2C3D

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5500744 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 P017B Cylinder Head Temperature Sensor Performance DTC P017C Cylinder Head Temperature Sensor Circuit Low DTC P017D Cylinder Head Temperature Sensor Circuit High DTC P017E Cylinder Head Temperature Sensor Circuit Erratic DTC P117F Cylinder Head Temperature Sensor Not Plausible DTC P14C0 Cylinder Head Temperature Sensor 2 Not Plausible DTC P2C3A Cylinder Head Temperature Sensor 2 Circuit Low DTC P2C3B Cylinder Head Temperature Sensor 2 Circuit High DTC P2C3C Cylinder Head Temperature Sensor 2 Circuit Erratic DTC P2C3D Cylinder Head Temperature Sensor and Sensor 2 Correlation Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc e
Signal — Terminal 2 P017C P017D, P017E P017D P017B, P017E, P2C3C, P2C3D, P117F, P14C0
Signal — Terminal 3 P2C3A P2C3B, P2C3C P2C3B P017B, P017E, P2C3C, P2C3D, P117F, P14C0
Low Reference — P017D, P2C3B * P017B, P017E, P2C3C,
© 2023 Gener al Motors. All rights reserved . P2C3D,
Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
P117F, P14C0
* Internal control module or component damage may occur if the circuit shorts to B+.

Typical Scan Tool Data

Circuit Operating Conditions: Engine = Idling — At normal operating temperature. Parameter Normal Range: 88 to 105°C (190 to 221°F) Short to Ground Open Short to Voltage
Signal — Terminal 2 140°C (284°F) −40°C (−40°F) −40°C (−40°F)
Signal — Terminal 3 140°C (284°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 — Terminal 2 The control module input circuit has an internal resistance connected to 5 V.
Signal — Terminal 3 The control module input circuit has an internal resistance connected to 5 V.
Low Reference Grounded through the control module.
Component Description
B96 Cylinder Head Temperature Sensor The sensor B96 contains 2 sensors in one assembly. The redundant design enables the control module to detect if the B96 signals indicate the same value. The sensor resistance varies with temperature.
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 P017B, P017C, P017E, P2C3A, P2C3C, P2C3D Engine = Running — Greater than 10 s Frequency the DTC runs = Continuously — After the running conditions are met P017D, P2C3B Engine = Running — Greater than 10 s Cylinder Head Temperature = Warmer than −20°C (−4°F) Frequency the DTC runs = Continuously — After the running conditions are met P117F, P14C0 Engine = Running — For greater than 3 min Engine Off Time = For greater than 6 h Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC P017C, P2C3A Cylinder Head Temperature Sensor = Warmer than 140°C (284°F) — For greater than 5 s P017D, P2C3B Cylinder Head Temperature Sensor = Colder than −40°C (−40°F) — For greater than 5 s P017B, P017E, P117F, P14C0, P2C3C, P2C3D Cylinder Head Temperature Sensor = Not within a calibrated range Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC — Additional actions taken: A/C Compressor = Off Cooling Fan = On Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B DTC Diagnostic Aids A malfunction in the following components may also cause DTC P017B to set: Engine Coolant Thermostat — Stuck Open 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) Cylinder Head Temperature Sensor Cylinder Head Temperature Sensor 2 ⇒ If not in the specified range Refer to: Circuit/System Testing ⇓ If in the specified range
  3. Verify the scan tool parameter: Cylinder Head Temperature Sensor = The value should not spike or drop out. Cylinder Head Temperature Sensor 2 = The value should not spike or drop out. – Perform the action while monitoring the parameter: Wiggle the harness and connector: B96 Cylinder Head 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 electrical connector: B96 Cylinder Head Temperature Sensor
  3. Test for less than 10 Ω between the test points: Low Reference circuit terminal 1 & Ground 3.1. Disconnect the electrical connector: X1 @ K20 Engine Control Module 3.2. Test for less than 2 Ω between the test points: Low Reference 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 less than 10 Ω
  4. Ignition » On / Vehicle » In Service Mode
  5. Verify the scan tool parameter: Cylinder Head Temperature Sensor = Colder than −39°C (−38°F) Cylinder Head Temperature Sensor 2 = Colder than −39°C (−38°F) ⇒ If warmer than −39°C (−38°F) 5.1. Ignition/Vehicle » Off 5.2. Disconnect the electrical connector: X2 @ K20 Engine Control Module 5.3. Test for infinite resistance between the test points: Signal circuit terminal 2 @ Component harness & Ground Signal circuit terminal 3 @ 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: — One at a time Signal circuit terminal 2 & Low Reference circuit terminal 1 Signal circuit terminal 3 & Low Reference circuit terminal 1 Verify the scan tool parameter: Cylinder Head Temperature Sensor = Warmer than 139°C (282°F) Cylinder Head Temperature Sensor 2 = Warmer than 139°C (282°F) ⇒ If colder than 139°C (282°F) 6.1. Ignition/Vehicle » Off & Remove » Jumper wire(s) 6.2. Disconnect the electrical connector: X2 @ K20 Engine Control Module 6.3. Ignition » On / Vehicle » In Service Mode 6.4. Test for less than 1 V between the test points: Signal circuit terminal 2 @ Component harness & Ground Signal circuit terminal 3 @ Component harness & Ground ⇒ If 1 V or greater » Repair the short to voltage on the circuit. ⇓ If less than 1 V 6.5. Ignition/Vehicle » Off 6.6. Test for less than 2 Ω between the test points: Signal circuit terminal 2 @ Component harness & The other end of the circuit @ Control module harness Signal circuit terminal 3 @ 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)
  7. Replace the component: B96 Cylinder Head Temperature Sensor Component Testing
  8. Ignition/Vehicle » Off
  9. Disconnect the electrical connector: B96 Cylinder Head Temperature Sensor
  10. Test the resistance between the test points: — One at a time Signal circuit terminal 2 & Low Reference circuit terminal 1 @ Component Signal circuit terminal 3 & Low Reference circuit terminal 1 @ Component
  11. Verify the value is within the range listed in the table: Temperature Versus Resistance ⇒ If not in the specified range Replace the appropriate component: B96 Cylinder Head Temperature Sensor ⇓ If in the specified range
  12. 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: B96 Cylinder Head Temperature Sensor ⇓ If infinite resistance
  13. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Cylinder Head Temperature Sensor Replacement — B96 Cylinder Head Temperature Sensor For control module replacement, programming, and setup refer to: Control Module References