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Tahoe / Yukon Service Manual

DTC P1010 or P2B60

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5471889 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 P1010 Engine Coolant Flow Control Valve Position Sensor Exceeded Minimum Learning Limit DTC P2B60 Engine Coolant Flow Control Valve Position Sensor Performance Circuit/System Description For an overview of the component/system, refer to: Cooling System Description and Operation

Circuit Description
5 V Reference Regulated voltage supplied by the control module.
Serial Data Digitally encoded information for communication between devices.
Low Reference Grounded through the control module.
Component Description
Q97M Engine Coolant Flow Control Valve - Main The component is actuated by a bidirectional DC motor. Q97M is part of the component: Q97 Engine Coolant Flow Control Valve
K20 Engine Control Module 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.

To achieve the normal operating temperature faster, an actuator valve can block the coolant flow through the engine block. Conditions for Running the DTC DTCs related to the following system/component = Not Set – B9 Ambient Air Temperature Sensor – B34B Engine Coolant Temperature Sensor 2 Ambient Air Temperature = Warmer than −20°C (−4°F) Engine Coolant Temperature Sensor 2 = Warmer than −20°C (−4°F) Ignition = On Ignition Voltage = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC Desired Engine Coolant Flow Control Valve Position = Learned Value Out of Range Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type A DTC Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type A DTC 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 DTC U063F is not set. ⇒ If DTC U063F is set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If DTC U063F is not set
  3. Verify there are no DTCs set related to the following component/system: B9 Ambient Air Temperature Sensor B34 Engine Coolant Temperature Sensor ⇒ If a related DTC is set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If a related DTC is not set
  4. Clear the DTCs.
  5. 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 Replace the component: Q97M Engine Coolant Flow Control Valve - Main ⇓ If no DTC is set
  6. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Engine Coolant Flow Control Valve Replacement — Q97M Engine Coolant Flow Control Valve
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