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 MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 389 (KEYLESS ENTRY SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESPANIC MODE INOPERATIVE
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Panic Mode Inoperative
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Panic Mode Inoperative
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Panic Mode Inoperative
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Did you perform the Remote Keyless Entry System Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Remote Keyless Entry |
| 2 | With the keyless entry transmitter, attempt to operate the panic function. Do the horns, park lamps, and headlamps all pulse on and off? |
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Do any of the panic functions operate? | Go to Step 4 | Go to Keyless Entry System Inoperative |
| 4 | Do the headlamps flash? | Go to Step 5 | Go to Symptoms - Lighting Systems in Lighting Systems |
| 5 | Do the park lamps flash? | Go to Horns Inoperative in Horns | Go to Symptoms - Lighting Systems In Lighting Systems |
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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.