Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2018SONIC PREMIER, 4D SEDAN, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 120 (AUTOMATIC TRANSMISSION - 8L45 (M5T) - DIAGNOSTIC INFORMATION AND PROCEDURES)
2018 Chevrolet Sonic Premier, 4D Sedan, Standard Trans
Section 120 (Automatic Transmission - 8L45 (M5T) - Diagnostic Information And Procedures)
2018 Chevrolet Sonic Premier, 4D Sedan, Standard TransSECTION Section 120 (Automatic Transmission - 8L45 (M5T) - Diagnostic Information And Procedures)
WARNING: This page is about a different car, the 2017 GMC Canyon and 2017 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
- Diagnostic Information and Procedures
- DTC P0601-P0604, P0606, P062F, P16F3, P16F4, or P16FB: Control Module
- DTC P0658 or P0659: Actuator High Control Circuit Group 1 Low/High Voltage
- 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
- Component Testing
- Repair Instructions
- DTC P0711-P0713: Transmission Fluid Temperature 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
- Component Testing
- Repair Instructions
- DTC P0716, P0717, P07BF, or P07C0: 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
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P071A: Transmission Tow Mode Switch Circuit
- DTC P0722, P0723, P077C, or P077D: Output 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
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P0746 or P0747: Transmission Control Solenoid Valve 1 Stuck Off/On
- DTC P0776 or P0777: Transmission Control Solenoid Valve 2 Stuck Off/On
- DTC P0796 or P0797: Transmission Control Solenoid Valve 3 Stuck Off/On
- DTC P0815, P0816, or P0826: Upshift/Downshift 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 P0851: Park/Neutral Position Switch Circuit Low Voltage
- Diagnostic Instructions
- DTC Descriptor
- 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
- Component Testing
- Repair Instructions
- DTC P0960, P0962, or P0963: Transmission Control Solenoid Valve 1 Control 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P0964, P0966, or P0967: Transmission Control Solenoid Valve 2 Control 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P0968, P0970, or P0971: Transmission Control Solenoid Valve 3 Control 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P175F: Acceleration Sensor Signal Message Counter Incorrect
- DTC P1761: Up and Down Shift Switch Signal Message Counter Incorrect
- DTC P1762: Transmission Mode Switch Signal Message Counter Incorrect
- DTC P176B-P176D: Intermediate 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P1824, P182D, P18B8, P18BD, or P18C2: Internal Mode Switch P 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P182A, P1838, P18B5, P18BA, or P18BF: Internal Mode Switch A 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P182B, P182C, P18B6, P18BB, or P18C0: Internal Mode Switch B 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- 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
- Component Testing
- Repair Instructions
- DTC P182F, P1839, P18B7, P18BC, or P18C1: Internal Mode Switch C 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P1840, P1841, P18B9, P18BE, or P18C3: Internal Mode Switch S 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P2670 or P2671: Actuator High Control Circuit Group 2 Low/High Voltage
- 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
- Component Testing
- Repair Instructions
- DTC P2714 or P2715: Transmission Control Solenoid Valve 4 Stuck Off/On
- DTC P2718, P2720, or P2721: Transmission Control Solenoid Valve 4 Control 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P2723 or P2724: Transmission Control Solenoid Valve 5 Stuck Off/On
- DTC P2727, P2729, or P2730: Transmission Control Solenoid Valve 5 Control 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P2736, P2738, or P2739: Transmission Control Solenoid Valve 6 Control 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P27A7-P27AD: Transmission Control Solenoid Valve 1-7 Calibration Incorrect
- DTC P2808 or P2809: Torque Converter Clutch (TCC) System Stuck Off/On
- DTC P2812, P2814, or P2815: Transmission Control Solenoid Valve 7 Control 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P2817 or P2818: Transmission Control Solenoid Valve 8 Stuck Off/On
- DTC P281D or P281E: Transmission Control Solenoid Valve 8 Control Circuit Low/High Voltage
- 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
- Component Testing
- Repair Instructions
- DTC P2824, P2826, or P2827: Transmission Control Solenoid Valve 9 Control 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 DTC
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- Solenoid Valve Characterization Reprogramming
- Symptoms - Automatic Transmission
- Tow/Haul Switch/Indicator Malfunction
- Transmission Fluid Level and Condition Check
- Transmission Fluid Fill Procedure
- 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
- 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
- Harsh, Soft, Delayed or Slipping First, Third, Fifth, Sixth or Seventh Shift
- No First, Third, Fifth, Sixth or Seventh Gear
- Harsh, Soft, Delayed or Slipping Second, Third, Fourth, Sixth or Eighth Shift
- No Second, Third, Fourth, Sixth or Eighth Gear
- Harsh, Soft, Delayed or Slipping Fourth, Fifth, Sixth, Seventh, Eighth, or Reverse Shift
- No Fourth, Fifth, Sixth, Seventh, Eighth or Reverse Gear
- Harsh, Soft, Delayed or Slipping First, Second, Seventh, Eighth, or Reverse Shift
- No First, Second, Seventh, Eighth or Reverse Gear
- Harsh, Soft, Delayed or Slipping First, Second, Third, Fourth, Fifth, or Reverse Shift
- No First, Second, Third, Fourth, Fifth or Reverse Gear
- No Torque Converter Clutch Apply
- No Torque Converter Clutch Release
- Transmission Service Fast Learn Procedure
- Fluid Pressure High or Low
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.