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Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures
2018 Chevrolet Tahoe FL, 4WD, GasSECTION Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures
- Diagnostic Information And Procedures
- DTC B0997: Auxiliary Electronic Control Unit Performance
- DTC B1024: Circuit Board Temperature Sensor Above Maximum Threshold (Audio Amplifier)
- DTC B1024: Circuit Board Temperature Sensor Threshold (Human Machine Interface Control Module)
- DTC B1025, B1035, B1045, Or B1055: Audio Output Circuits (UQ3)
- 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 B1025, B1045, B1065, B1075, B1085, Or B1095: Audio Output Circuits 1, 3, 5, 6, 7 & 8 (UQA With Front Bench Seat)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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 B1025, B1035, B1045, B1065, B1075, B1085, Or B1095: Audio Output Circuits 1, 2, 3, 5, 6, 7 & 8 (UQA With Front Bucket Seats)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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 B1025, B1035, B1045, B1065, B1075, B1085, B1095, B1105, Or B1115: Audio Output Circuits (UQS)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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 B1025, B1035, B1045, B1065, B1075, B1085, B1095, B1105, B1115, B1125 Or B1135: Audio Output Circuits (UQH)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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 B124B: USB 1 Circuit
- 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 B124C: USB 2 Circuit
- 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 B124F: Universal Serial Bus (USB) Programming
- DTC B125A: Antenna Signal 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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Component Testing
- Repair Instructions
- DTC B125C: Satellite Antenna Circuit
- 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 B1271: Theft Protection Active
- DTC B1277: Microphone 1 Input Signal Circuit
- DTC B127A: Auxiliary Video Input Signal Circuit Open Circuit
- DTC B127E: Front Video Display Output Signal
- DTC B1280: Rear Seat Entertainment Input Signal Circuit Signal Amplitude < Minimum (X88/Z88 Without DNU)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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 B1280: Rear Seat Entertainment Input Signal Circuit Signal Amplitude < Minimum (X88/Z88 With DNU)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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 B1280: Rear Seat Entertainment Input Signal Circuit Signal Amplitude < Minimum (Z75 With DNU)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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 B1280: Rear Seat Entertainment Input Signal Circuit Signal Amplitude < Minimum (Z75 Without DNU)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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 B1282: Display Not Responding - Signal Amplitude < Minimum
- 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 B12A4: Infotainment Faceplate Control Module A
- DTC B12A6: Info Display Module Internal Malfunction
- DTC B12A7: Optical Media Drive
- DTC B12A8: Optical Media Drive Theft Locked
- DTC B1446 Or B1447: Backup Power Source
- DTC B245A: Telematics Green Indicator Circuit
- DTC B245B: Keypad Red LED Control
- DTC B245C: Telematics Audio Output Circuit
- DTC B2455: Cellular Phone Microphone Circuit
- DTC B2462: Global Positioning System Signal (Without UE1/UI3)
- DTC B2462: Global Positioning System (UE1/UI3)
- 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 B2470: Cellular Phone Antenna Circuit Malfunction
- DTC B2476 Or B2482: Cellular Phone Select Service Switch (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
- Diagnostic Aids
- Reference Information
- Circuit/System Verification
- Circuit/System Testing
- Repair Instructions
- DTC B2476 Or B2482: Cellular Phone Select Service Switch Open (UE3)
- DTC B2485: Wireless Communication (BT) Antenna Circuit
- Symptoms - Cellular Communication
- Symptoms - Entertainment
- Application Malfunction
- Audio/Video Player Adapter - Audio Or Video Malfunction
- Auxiliary Audio Input Malfunction (IO5/IO6 Without DO7)
- 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
- Auxiliary Audio Input Malfunction (IO5/IO6 With D07)
- Bluetooth Malfunction (With UPF)
- Bluetooth Malfunction (Without UPF)
- Digital Radio Poor Or No Reception
- 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
- Phone Projection Malfunction (Apply CarPlay)
- Phone Projection Malfunction (Android Auto)
- OnStar Microphone Malfunction
- Media Disc Player Malfunction (X88/Z88 Without U42)
- Media Disc Player Malfunction (X88/Z88 With U42)
- Media Disc Player Malfunction (Z75 Without U42)
- Media Disc Player Malfunction (Z75 With U42)
- OnStar Audio Malfunction
- No Global Positioning System (GPS) Reception (Without UE1/UI3)
- No Global Positioning System (GPS) Reception (UE1/UI3)
- 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
- OnStar Button LED Malfunction
- OnStar Call Center Remote Function Requests Malfunction
- OnStar Button Malfunction
- OnStar Steering Wheel Control Functions Malfunction
- Radio Information Display Malfunction
- Radio Poor Reception
- 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
- Speaker Replacement Reference
- Speaker Malfunction (UQ3)
- Speaker Malfunction (UQA With Front Bench Seat)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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
- Speaker Malfunction (UQA With Front Bucket Seats)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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
- Speaker Malfunction (UQS)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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
- Speaker Malfunction (UQH)
- Diagnostic Instructions
- DTC Descriptors
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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
- Unable To Contact OnStar Call Center
- Video Display Malfunction (X88/Z88 Without DNU)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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
- Video Display Malfunction (X88/Z88 With DNU)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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
- Video Display Malfunction (Z75 With DNU)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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
- Video Display Malfunction (Z75 Without DNU)
- Diagnostic Instructions
- DTC Descriptor
- Diagnostic Fault Information
- Circuit/System Description
- Diagnostic Aids
- 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
- Video Entertainment System Remote Control Malfunction (Without DNU)
- Video Entertainment System Remote Control Malfunction (With DNU)
- Video Entertainment System Wireless Headphone Malfunction (Without DNU)
- Video Entertainment System Wireless Headphone Malfunction (With DNU)
- OnStar Voice Recognition Malfunction
- Voice Recognition Malfunction (With UE1)
- Voice Recognition Malfunction (Without UE1)
- Voice Recognition Malfunction (IO6 With CW1)
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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.