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Tahoe / Yukon Service Manual

DTC P1761

Automatic Transmission - 10L80 MHS MQC | Diagnostic Information and Procedures | Document ID: 5224516 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 P1761 Up and Down Shift Switch Signal Message Counter Incorrect Circuit/System Description Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. Conditions for Running the DTC DTC U0073 = Not set Battery Voltage = Greater than 11 V Ignition and Start Signal = 9 to 32 V Ignition and Start Switch Signal = On Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC Serial Data = Message Counter Incorrect — Between the following control modules: K9 Body Control Module K71 Transmission Control Module The above condition(s) must occur for greater than 10 s. Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type C Manual Shift Control = Disabled Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type C Reference Information DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Control Module References Circuit/System Verification

  1. Ignition » On / Vehicle » In Service Mode
  2. Verify there are no DTCs set related to the following component/system: Serial Data ⇒ If a related DTC is set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If a related DTC is not set
  3. Perform the following action: Clear the DTCs.
  4. Operate the vehicle within the Conditions for Running the DTC. Verify the DTC does not set. ⇒ If the DTC sets 4.1. Ignition/Vehicle » Off 4.2. Replace the component: K9 Body Control Module 4.3. Operate the vehicle within the Conditions for Running the DTC. 4.4. Verify the DTC does not set. ⇒ If the DTC sets » Replace the component: K71 Transmission Control Module ⇓ If the DTC is not set 4.5. All OK. ⇓ 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 Additional Procedures Transmission Service Fast Learn Procedure — Perform only when the component/system is serviced.