Keyless Entry System Not Working Due to Failed Fob/Entry Receiver on GMC Sierra 2500 HD

The keyless entry system may stop working. Our technicians tell us the key fobs and keyless entry receiver may need to be replaced to correct this fault.

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Average mileage: 104,666 (61,000–133,000)
4 model years affected: 2003, 2004, 2007, 2008
4 people reported this problem
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problem details
2007 GMC Sierra 2500 HD 61,000 mi,
Key FOB not working. It will not unlock or lock, my guess is the battery is dead but I see no way to replace the battery.