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 MANUALSCHEVROLET2020EXPRESS 2500 LS, 2.8L ENG VIN 1REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTINFOTAINMENTCELLULAR, ENTERTAINMENT, AND NAVIGATION SYSTEM
2020 Chevrolet Express 2500 LS, 2.8L Eng VIN 1
Cellular, Entertainment, And Navigation System
2020 Chevrolet Express 2500 LS, 2.8L Eng VIN 1SECTION Cellular, Entertainment, And Navigation System
- Specifications
- Schematic Wiring Diagrams
- Diagnostic Information and Procedures
- DTC B1025, B1035, B1045, or B1055
- 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
- Repair Instructions
- DTC B1259
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Conditions for Running the DTC
- Conditions for Setting the DTC
- Actions Taken When the DTC Sets
- Conditions for Clearing the DTC
- Reference Information
- Circuit System Verification
- Circuit/System Testing
- Repair Instructions
- DTC B2455 (with UE1)
- DTC B2455 (without UE1)
- 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
- Repair Instructions
- DTC B2462 (UE1)
- Diagnostic Instructions
- DTC Descriptors
- 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 B2462 (without UE1)
- DTC B2470
- DTC B2476 or B2482
- 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
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- Symptoms - Cellular Communication
- Symptoms - Entertainment
- Symptoms - Navigation Systems
- Auxiliary Audio Input Malfunction
- Bluetooth Malfunction
- Digital Radio Malfunction
- OnStar Microphone Malfunction
- Navigation System - Voice Recognition Malfunction
- OnStar Audio Malfunction
- No Global Positioning System (GPS) Reception (UE1)
- Diagnostic Instructions
- DTC Descriptors
- 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
- No Global Positioning System (GPS) Reception (without UE1)
- OnStar Button LED Malfunction
- OnStar Call Center Remote Function Requests Malfunction
- OnStar Button Malfunction
- OnStar Steering Wheel Control Functions Malfunction
- Radio Poor Reception
- Speaker Replacement Reference
- Speaker Malfunction
- Unable to Contact OnStar Call Center
- OnStar Voice Recognition Malfunction
- DTC B1025, B1035, B1045, or B1055
- Repair Instructions
- Mobile Telephone Microphone Replacement
- Communication Center Call Switch Replacement
- Communication Interface Module Replacement
- Communication Interface Module Bracket Replacement
- Compact Disc Care and Cleaning
- Radio Bracket Replacement
- Radio Replacement
- Digital Radio Receiver Replacement
- Navigation Signal Splitter Replacement
- Radio Antenna Replacement
- Digital Radio, Mobile Telephone, and Vehicle Location Antenna Cable Replacement
- Radio Antenna Cable Replacement
- High Frequency Antenna Replacement
- USB Receptacle Replacement
- Radio Front Side Door Speaker Replacement
- Radio Rear Speaker Replacement - Lower
- Radio Rear Speaker Replacement - Upper
- Radio Control Switch Replacement
- Instrument Panel Center Accessory Function Switch Replacement
- Description and Operation
- Navigation System Description and Operation
- OnStar Description and Operation
- Notes
- Telematics Communication Interface Control Module
- OnStar® Three Button Assembly
- Secondary OnStar® Controls
- OnStar® Microphone
- Cellular and GPS Antennas
- OnStar® RemoteLink
- Compass Heading
- Bluetooth® (If Equipped)
- Bluetooth® Features Supported
- Pairing a Bluetooth® Cellular Phone to the Vehicle
- Phantom Phone Calls
- Back-up Battery (If Equipped)
- WiFi Hotspot
- Audio System Interface
- OnStar® Sleep Cycle
- Features
- Teletypewriter (TTY) Users
- Deactivated OnStar® Accounts
- OnStar® Cellular, GPS, and Diagnostic Limitations
- Mobile Identification Number and Mobile Directory Number
- Operation of the OnStar® Speech Recognition Systems
- Firmware Over The Air
- Radio/Audio System Description and Operation
- Notes
- Radio Circuit Operation
- Antenna System
- AM/FM Reception
- Speaker Operation
- Radio Data System (RDS) (If equipped)
- RDS Messages
- MP3/CD Formatting Information for MP3/CD Radios
- Integral Multi Disc CD Changer (IMDX) (If equipped)
- Radio Error Messages
- Theft Deterrent
- Steering Wheel Controls (if equipped)
- Using the Auxiliary Input Jack (if equipped)
- Speed Compensated Volume (If equipped)
- Clock
- 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.