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Tahoe / Yukon Service Manual

DTC P2C21

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 P2C21 Engine Oil Temperature Sensors 1-2 Not Plausible Circuit/System Description For an overview of the component/system, refer to: Instrument Cluster Description and Operation

Component Description
B36 Engine Oil Temperature Sensor The temperature sensor is a negative temperature coefficient thermistor, a resistor which changes based on temperature.
K20 Engine Control Module The control module converts the analog voltage signal input to a temperature value.

Conditions for Running the DTC Ignition » On / Vehicle » In Service Mode Conditions for Setting the DTC Engine Oil Temperature Sensor 1 Circuit ≠ Engine Oil Temperature Sensor 2 Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B DTC Reference Information Schematic Reference Instrument Cluster 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 no other DTCs are set. ⇒ If other DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If no other DTCs are set
  3. Replace the component: B36 Engine Oil Temperature Sensor
  4. Verify the DTC does not set. ⇒ If the DTC is set Replace the component: K20 Engine Control Module ⇓ If the DTC is not set
  5. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification For control module replacement, programming, and setup refer to: Control Module References