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 80 (TRANSFER CASE - MP 3025G (NQ6))
2018 Chevrolet Sonic Premier, 4D Sedan, Standard Trans
Section 80 (Transfer Case - Mp 3025G (NQ6))
2018 Chevrolet Sonic Premier, 4D Sedan, Standard TransSECTION Section 80 (Transfer Case - Mp 3025G (NQ6))
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.
- Specifications
- Schematic Wiring Diagrams
- Component Locator
- Diagnostic Information and Procedures
- DTC B0770: AWD Indicator Circuit Short
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC B0775: 4WD HI Indicator Circuit Short
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC B0780: 4WD LO Indicator Circuit Short
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC B0785: 2WD HI Indicator Circuit Short
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC B0790: Neutral Indicator Circuit Short
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC B2725, P0698, or P0699: Transfer Case Range Selection Switch Circuit/5V Reference 3 Circuit Voltage
- Diagnostic Instructions
- DTC Descriptor
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC C0306 or C0381: Range Actuator
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC C0321 or C0326: Range Actuator Lock Control
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC C0364 or C0379: Front Axle System/Front Axle Switch
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC C0374: General System Performance Temperature High
- Diagnostic Instructions
- DTC Descriptor
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC C0387: Unable to Complete Shift
- Diagnostic Instructions
- DTC Descriptor
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC C038D: Range Actuator - Position Not Learned
- DTC C0392, P0642, or P0643: Transfer Case Range Position Sensor Circuit/5V Reference 1 Voltage
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC C0396, C039E, P0652, or P0653: Range Actuator Position Sensor/5V Reference 2 Circuit Voltage
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC C0397: Transfer Case Clutch/Transfer Case Range Position Sensor
- Diagnostic Instructions
- DTC Descriptor
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC C0398: Range Actuator Position - Range Position Correlation
- Diagnostic Instructions
- DTC Descriptor
- 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 C0550: Electronic Control Unit (ECU)
- DTC C0569: System Configuration Error Calibration Not Learned
- DTC P0601, P0602, P0604, P0606, P062F, or P064F: Control Module
- DTC C0896: Device Voltage Range Below/Above Threshold
- DTC P17D4, P185F or P279A-P279C: Transfer Case (NQ6, NQ7)
- DTC P2160 or P2161: Vehicle Speed Sensor (VSS) 2 Circuit (2-Wire)
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC P2160 or P2161: Vehicle Speed Sensor (VSS) 2 Circuit (3-Wire)
- 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- Symptoms - Transfer Case
- Front Axle Will Not Engage
- Front Axle Will Not Disengage
- Transfer Case Shift Control Switch Inoperative
- No Correction for Slip in All-Wheel Drive Mode
- Transfer Case Shift Control Switch Indicator Always On - Two or More
- Transfer Case Shift Control Switch Indicator Inoperative - One or More
- Service Indicator Always On
- Transfer Case High/Low Clutch Reset (NQ6)
- Transfer Case Popping Noise
- Transfer Case Whine or Rumble Noise
- Transfer Case Growl or Grinding Noise
- Transfer Case Grating Noise
- Transfer Case Clunk in 2HI Only
- Transfer Case Clunk in 4HI
- Transfer Case Clunk in 4LO
- Transfer Case Clunk During Acceleration and Deceleration
- Transfer Case Shudder or Binding
- Transfer Case Will Not Shift
- Transfer Case Jumps Out of Gear
- Transfer Case Leak Diagnosis
- DTC B0770: AWD Indicator Circuit Short
- Repair Instructions - On Vehicle
- Transfer Case Selector Switch Replacement
- Transfer Case Control Module Replacement
- Transfer Case Fluid Replacement
- Transfer Case Two/Four Wheel Drive Actuator Position Sensor Replacement
- Transfer Case Four Wheel Drive Actuator Replacement
- Vehicle Speed Sensor Replacement
- Front Output Shaft Seal Replacement
- Transfer Case Front Output Shaft Oil Slinger Replacement
- Transfer Case Front Output Shaft Flange Replacement
- Rear Output Shaft Seal Replacement
- Transfer Case Assembly Replacement (NQ6)
- Transfer Case Adapter Replacement (Equipped with LWN Engine)
- Transfer Case Adapter Replacement (Equipped with LCV Engine)
- Input Shaft Seal Replacement
- Transfer Case Oil Fill Plug Replacement
- Repair Instructions - Off Vehicle
- Transfer Case Disassemble
- Transfer Case Holding Fixture Installation
- Transfer Case Access Hole Plugs, Fill and Drain Plug, Vent, 4 Wheel Drive Actuator, 2/4 Wheel Drive Actuator Position Sensor, Shift Detent Plunger Plug, and Vehicle Speed Sensor Removal
- Transfer Case Rear Output Shaft Seal and Bushing Removal
- Transfer Case Rear Extension Removal
- Transfer Case Oil Pump Suction Pipe and Actuator Shaft Gear Removal
- Transfer Case Front Output Shaft Driven Sprocket, Clutch Assembly, Drive Chain, High/Low Shift Fork Assembly, High/Low Clutch and Chip Collector Magnet Removal
- Transfer Case Clutch Assembly Disassemble
- Transfer Case Input Shaft Oil Seal Removal
- Transfer Case Input Shaft and High/Low Planetary Assembly Removal
- Transfer Case Front Output Shaft and Flange Removal
- Transfer Case Front Output Shaft Front Bearing Removal
- Transfer Case Front Output Shaft Rear Bearing Removal
- Transfer Case Stud Removal
- Transfer Case Front Half Cleaning and Inspection
- Transfer Case Rear Half Cleaning and Inspection
- Transfer Case Oil Pump Cleaning and Inspection
- Rear Output Shaft Cleaning and Inspection
- Front Output Shaft and Input Shaft Cleaning and Inspection
- Drive Chain, Drive Sprocket, and Driven Sprocket Cleaning and Inspection
- High/Low Planetary Carrier Cleaning and Inspection
- High/Low Shift Components Cleaning and Inspection
- Two/Four Wheel Drive Shift Components Cleaning and Inspection
- Transfer Case Four Wheel Drive Actuator Lever Shaft Bearing Replacement - Front
- Transfer Case Four Wheel Drive Actuator Lever Shaft Bearing Replacement - Rear
- Input Shaft Pilot Bearing Replacement
- Front Output Shaft Drive Sprocket Bearing Replacement
- High/Low Shift Fork Replacement
- Transfer Case Assemble
- Transfer Case Stud Installation
- Transfer Case Front Output Shaft Rear Bearing Installation
- Transfer Case Front Output Shaft Front Bearing Installation
- Transfer Case Front Output Shaft and Flange Installation
- Transfer Case Input Shaft and High/Low Planetary Assembly Installation
- Measuring Clutch Pack Height
- Clutch Assembly Installation
- Measuring/Adjusting Clutch Assembly Height
- Clutch Pressure Plate Installation
- Transfer Case Rear Output Shaft Assembly
- Transfer Case Front Output Shaft Driven Sprocket, Clutch Assembly, Drive Chain, High/Low Shift Fork Assembly, High/Low Clutch and Chip Collector Magnet Installation
- Transfer Case Oil Pump Suction Pipe and Actuator Shaft Gear Installation
- Transfer Case Rear Extension Installation
- Transfer Case Rear Output Shaft Seal and Bushing Installation
- Transfer Case Access Hole Plugs, Fill and Drain Plug, Vent, 4 Wheel Drive Actuator, 2/4 Wheel Drive Actuator Position Sensor, Shift Detent Plunger Plug, and Vehicle Speed Sensor Installation
- Input Shaft Seal Installation and Transfer Case Holding Fixture Removal
- Transfer Case Disassemble
- Description and Operation
- Transfer Case Identification
- Transfer Case Description and Operation
- Notes
- Transfer Case Shift Control Switch
- 2WD Mode Power Flow
- 4HI Mode Power Flow
- 4HI Mode Active Power Flow
- 4LO Mode Power Flow
- NEUTRAL Mode Power Flow
- Front Axle Actuator
- Service 4 Wheel Drive Message
- Transfer Case Two/Four Wheel Drive Actuator Assembly
- Transfer Case Two/Four Wheel Drive Incremental Sensor
- Transfer Case Actuator Motor Lock
- Transfer Case Actuator Shaft Position Sensor Assembly
- Transfer Case Shift Control Module
- Vehicle Speed Sensor (VSS)
- Special Tools and Equipment
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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.