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 MANUALSCADILLAC2013ATS 2.0L ENG VIN X, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISDATA COMMUNICATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC U0028: MOST BUSREPAIR VERIFICATION
2013 Cadillac ATS 2.0L Eng VIN X, AWD
Repair Verification
2013 Cadillac ATS 2.0L Eng VIN X, AWDSECTION Repair Verification
- Ignition OFF, all access doors closed, all vehicle systems OFF, and all keys at least 3 m (9.8 ft) away from vehicle. It may take up to 2 min for all vehicle systems to power down.
- Ignition ON.
- Access the A11 Radio scan tool data display and verify that the Surrogate MOST Master Node Upstream Position parameter value is None.
- If the value is not None
Disconnect the A11 Radio power or the battery cables to reset this value to None.
- If the value is None
- If the value is not None
- All OK.
RENDER: 1.0x
NO RELATED
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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.