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 MANUALSGMC2013YUKON 4WD V8-6.0L HYBRIDREPAIR AND DIAGNOSISLIGHTING AND HORNSTESTING AND INSPECTIONSYMPTOMS - LIGHTING
2013 GMC Yukon 4WD V8-6.0L Hybrid
Symptoms - Lighting
2013 GMC Yukon 4WD V8-6.0L HybridSECTION Symptoms - Lighting
Symptoms - Lighting
1. Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle , before using the Symptom Tables in order to verify that all of the following are true:
* There are no DTCs set.
* The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following:
* Exterior Lighting Systems Description and Operation Exterior Lighting Systems
* Interior Lighting Systems Description and Operation Interior Lighting Systems
Visual/Physical Inspection
* Inspect for aftermarket devices which could affect the operation of the Lighting System. Refer to Checking Aftermarket Accessories Checking Aftermarket Accessories.
* Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
* Backup Lamps Malfunction Backup Lamps Malfunction
* Courtesy Lamps Malfunction Courtesy Lamps Malfunction
* Daytime Running Lamps Malfunction (With Z88, Z75, and Z88) Daytime Running Lamps Malfunction (With Z88, Z75, and Z88)Daytime Running Lamps Malfunction (With T4Q) Daytime Running Lamps Malfunction (With T4Q)
* Door Sill Illumination Malfunction Door Sill Illumination Malfunction
* Front Fog Lamps Malfunction Front Fog Lamps Malfunction
* Rear Fog Lamps Malfunction Rear Fog Lamps Malfunction
* Hazard Lamps Malfunction Hazard Lamps Malfunction
* Headlamps Malfunction (With X88, Z75, and Z88) Headlamps Malfunction (With X88, Z75, and Z88)Headlamps Malfunction (With T4Q) Headlamps Malfunction (With T4Q)
* High Intensity Discharge Lamp Malfunction High Intensity Discharge Lamp Malfunction
* Interior Backlighting Malfunction Interior Backlighting Malfunction
* Park, License, and/or Tail Lamps Malfunction (Front LED Park/Marker Lamps with T4Q) Park, License, and/or Tail Lamps Malfunction (Front LED Park/Marker Lamps with T4Q)Park, License, and/or Tail Lamps Malfunction (With X88, Z75, and Z88) Park, License, and/or Tail Lamps Malfunction (With X88, Z75, and Z88)
* Stop Lamps Malfunction Stop Lamps Malfunction
* Turn Signal Lamps and/or Indicators Malfunction Turn Signal Lamps and/or Indicators Malfunction
RENDER: 1.0x
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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.