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 1769 (KEYLESS ENTRY SYSTEM AND REMOTE FUNCTIONS)DIAGNOSTIC INFORMATION AND PROCEDURESKEY FOB NOT DETECTEDCIRCUIT/SYSTEM VERIFICATION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Verification
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Verification
WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
This condition may be caused by low vehicle battery voltage. If the battery is not sufficiently charged (above 10 volts), the system will have difficulties detecting the fob and the NO FOB DETECTED message will be displayed. Correct the low battery voltage condition to eliminate this condition.
- Verify DTC B3119, B3120, B3121, B3122, or B3123 is not set.
- If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- With the vehicle locked, attempt to passively unlock and enter the vehicle by approaching the vehicle with a valid transmitter and pulling the exterior door handle. The door should unlock and open.
- If unable to enter the vehicle passively, refer to Keyless Entry System Inoperative (Active) or Keyless Entry System Inoperative (Passive) .
- Place the transmitter in the console active antenna pocket and attempt to start the vehicle. The vehicle should start.
- If the vehicle does not start, perform the Transmitter Programming (North America, except Canada) or Transmitter Programming (Canada, Europe, Asia, Middle East) procedure.
- While placing the keyless entry transmitter in various locations within the vehicle interior, attempt to start the vehicle. The NO FOB DETECTED message should be displayed on the DIC.
- If the message is not displayed, inspect for any sources of RF interference such as cell phone chargers, power supplies, etc. that would interrupt transmitter and antenna communication. If inspect does not reveal any items causing RF interference, contact the customer and question the customer about the conditions or location where the NO FOB DETECTED condition occurs. Discuss any devices that are normally kept in the vehicle, such as a laptop or cell phone charger, which may have been removed when the vehicle was brought in for service. It may be necessary to explain to the customer how RF interference degrades the performance of the system.
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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.