2008 Malibu LT 2.4 L Keyless Entry Help

Asked by ybnormal67 Aug 29, 2023 at 03:19 PM about the 2008 Chevrolet Malibu Classic LT FWD

Question type: Maintenance & Repair

Here is an odd one. Been searching forums and can't find any answers.
Here is what I have done.  New Lock Actuators  /  New Car battery  /  New
Genuine GM FOB and New FOB Battery - Programmed at a lock smith  /  
Bought the car used  /  The doors will lock and unlock with door button and
the trunk will open with the trunk button.
Here is the problem  /  I locked the car and go in side.  Come out later and
the key fob will not unlock the doors, truck will not open and the panic alarm
will not activate  /  Unlocked the door with the key and the alarm goes off  /  
Silence the alarm with the fob and the doors will unlock and lock with the fob.
Close the door and lock them with the fob. And then it repeats.
So I know the fob works and the door locks work with the fob. Not sure why
the trunk wont open with the fob. There are no codes showing up or check
engine lights. I have run an scan with obd 2 scanner and it shows nothing.

1 Answer
157,625

James answered about a year ago

It sounds like the fob and vehicle are not synchronized. GM security systems work on a rolling code system. Each time you use the fob the vehicle knows what the next code will be. If the fob doesn't transmit the next expected code, the vehicle computer ignores the fob. This is probably something that your local Chevrolet Dealer will need to fix. Jim

Mark helpful

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