Section 19 (Automatic Transmission - 6L80 (MYC) Or 6L90 (MYD) - Diagnostic Information And Procedures)
WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban 3500 HD, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
- Diagnostic Information And Procedures
- DTC P0601, P0603, P0604, Or P062F: Control Module Memory
- DTC P0634: Control Module Overtemperature
- DTC P0658 Or P0659: Actuator High Control Circuit Group 1 Low/High Voltage
- DTC P0667, P0668, Or P0669: Control Module Temperature Sensor
- DTC P06AC, P06AD, Or P06AE: Control Module Power Up Temperature Sensor
- DTC P0711, P0712, Or P0713: Transmission Fluid Temperature Sensor
- DTC P0716 Or P0717: Input Speed Sensor
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Typical Scan Tool Data
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC P071A: Transmission Tow Mode Switch Circuit
- DTC P0722 Or P0723: Output Speed Sensor Circuit
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Typical Scan Tool Data
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DIC/DTC
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC P0741 Or P0742: Torque Converter Clutch (TCC) System
- DTC P0751 Or P0752: Shift Solenoid Valve 1 Performance
- DTC P0756: Shift Solenoid Valve 2 Performance
- DTC P0776 Or P0777: Pressure Control Solenoid Valve 2 - Stuck Off/ON
- DTC P0796 Or P0797: Pressure Control Solenoid Valve 3 - Stuck Off/ON
- DTC P0815, P0816, P0826, Or P1876: Switch Circuit
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P0842 Or P0843: Transmission Fluid Pressure Switch 1 Circuit Low/High Voltage
- DTC P0850, P0851, Or P0852: Park/Neutral Position Switch
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Typical Scan Tool Data
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC P0872 Or P0873: Transmission Fluid Pressure Switch 3 Circuit Low/High Voltage
- DTC P0877 Or P0878: Transmission Fluid Pressure Switch 4 Circuit Low/High Voltage
- DTC P0961, P0962, Or P0963: Line Pressure Control Solenoid Valve
- DTC P0965, P0966, Or P0967: Pressure Control Solenoid Valve 2
- DTC P0969, P0970, Or P0971: Pressure Control Solenoid Valve 3
- DTC P0973 Or P0974: Shift Solenoid Valve 1 Control Circuit
- DTC P0976 Or P0977: Shift Solenoid Valve 2 Control Circuit
- DTC P0989 Or P0990: Transmission Fluid Pressure Switch 5 Circuit Low/High Voltage
- DTC P1761: Up And Down Shift Switch Signal Message Counter Incorrect
- DTC P1762: Transmission Mode Switch Signal Message Counter Incorrect
- DTC P182E Or P1915: Internal Mode Switch
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Typical Scan Tool Data
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Action Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC P2714 Or P2715: Pressure Control Solenoid Valve 4 - Stuck Off/ON
- DTC P2719, P2720, Or P2721: Pressure Control Solenoid 4
- DTC P2723 Or P2724: Pressure Control Solenoid Valve 5 - Stuck Off/On
- DTC P2728, P2729, Or P2730: Pressure Control (PC) Solenoid Valve 5
- DTC P2762, P2763, Or P2764: Torque Converter Clutch (TCC) Pressure Control Solenoid Valve
- DTC P2771: Four Wheel Drive (4WD) Switch Circuit (NQF, NQH)
- Symptoms - Automatic Transmission
- Control Solenoid Valve And Transmission Control Module Assembly Inspection
- Control Solenoid Valve And Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test
- Control Solenoid Valve And Transmission Control Module Assembly Solenoid Performance Test
- Reset Transmission Adapts
- Tow/Haul Switch/Indicator Always On Or Inoperative
- Transmission Fluid Level And Condition Check
- Line Pressure Check
- Road Test
- Torque Converter Diagnosis
- Torque Converter Stator
- Poor Acceleration at Low Speed - Stator Roller Clutch Freewheels at All Times
- Poor Acceleration at High Speed - Stator Roller Clutch is Locked Up at All Times
- Torque Converter Bearing Noise
- Torque Converter Clutch
- Torque Converter Clutch Shudder
- If Shudder Occurs During TCC Apply, Release, and ECCC
- If Shudder Occurs After TCC has Locked
- Torque Converter Vibration Test
- Isolating Vibration
- Indexing Torque Converter
- Flex Plate/Torque Converter Vibration Test
- Bushing And Mating Shaft Inspection
- Vibration
- Noise And Vibration Analysis
- Whine/Growl Noise That Changes With Vehicle Speed
- Whine/Growl Noise That Changes With Engine Speed
- Noise In First Or Reverse Gear
- Noise In First, Second, Third, Fourth, Fifth, Or Reverse Gear
- Noise In First, Second, Sixth, Or Reverse Gear
- Noise In Second Or Sixth Gear
- Noise During 3-4 or 4-3 Shifts
- Noise In Fourth, Fifth, Or Sixth Gear
- Clutch Plate Diagnosis
- Engine Coolant/Water In Transmission
- Fluid Leak Diagnosis
- Case Porosity Repair
- Automatic Transmission Fluid Leaks
- Shift Indicator Indicates Wrong Gear Selection
- No Park Or Drive
- Harsh Garage Shift
- No Drive In All Ranges
- No First Gear
- No First And Reverse Gears
- Harsh, Soft, Delayed Or Slipping First Or Reverse Gear
- No First, Second, Third, And Fourth Gear
- Harsh, Soft, Delayed Or Slipping 1-2-3-4 Shift
- No Second And Sixth Gear
- Harsh, Soft, Delayed Or Slipping Second Or Sixth Gear
- No Third, Fifth, And Reverse Gear
- Harsh, Soft, Delayed Or Slipping Third, Fifth, Or Reverse Gear
- No Fourth, Fifth, And Sixth Gear
- Harsh, Soft, Delayed Or Slipping 4-5-6 Shift
- No Torque Converter Clutch Apply
- No Torque Converter Clutch Release
- Harsh Torque Converter Clutch Apply, Or Inoperative Or No Electronically Controlled Capacity Clutch Control
- No Reverse Gear
- Fluid Pressure High Or Low
- No Torque Converter Clutch Slip With Torque Converter Clutch Engaged