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 MANUALSCHEVROLET2018TAHOE FL, 4WD, GASREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISDATA COMMUNICATION SYSTEM - DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC INFORMATION AND PROCEDURESDTC U0028: MOST BUSCIRCUIT/SYSTEM VERIFICATION
2018 Chevrolet Tahoe FL, 4WD, Gas
Circuit/System Verification
2018 Chevrolet Tahoe FL, 4WD, GasSECTION Circuit/System Verification
- Ignition ON. Radio ON.
- If equipped, verify that the A33 Media Disc Player is operative by inserting or ejecting a disk.
- If the disk can not be inserted or ejected
Test the power, ground, and serial data circuits of the A33 Media Disc Player for an open/high resistance.
- Go to next step: If the disk can be inserted or ejected
- If the disk can not be inserted or ejected
- Verify that the scan tool communicates with each MOST device, except the A33 Media Disc Player.
- If any MOST device does not communicate with the scan tool
Refer to DTC U0100-U02FF to diagnose power, ground, and serial data circuits of that MOST device.
- Go to next step: If all MOST devices communicate with the scan tool
- If any MOST device does not communicate with the scan tool
- Verify that DTC U2098 or DTC U0029 02 is not set.
- If any of the DTCs are set
Refer to DTC U2098 .
- Go to next step: If none of the DTCs are set
- If any of the DTCs are set
- Verify that DTC U0028 is not set.
- If the DTC U0028 is set
- Using the scan tool, select the MOST Bus Diagnostic Starting Point function from A11 Radio Control Functions menu.
- Determine the fault location from A11 Radio scan tool Control Functions, MOST Bus Diagnostic Starting Point. Reference Node Locations of MOST Bus Communication Break parameter value.
- Refer to Circuit/System Testing.
- Go to next step: If the DTC U0028 is not set
- Refer to Repair Verification.
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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.