Key fob stops working after the car sits parked
When a vehicle sits parked for a period, battery drain from parasitic power draws can drop the 12V battery voltage just enough to put the keyless entry receiver into a low-power sleep mode or cause control module communication issues. Driving the car charges the battery back up and wakes the module, which restores normal remote fob functionality. Extreme ambient heat can also accelerate battery degradation or cause micro-outages in onboard computers like the infotainment system, contributing to intermittent electrical failures.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Using the manual key lock/unlockDid this help you?
- 2Using the interior lock/unlock, window controls, and trunk latch buttons inside the carDid this help you?
- 3Replacing fob batteriesDid this help you?
- 4Checking car battery healthDid this help you?
- 5Manually unlocking the car with the physical key and waiting until after driving for the remote fob to function again.Did this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I had to change out the battery in the fob this morning bc it said it was dead, tried starting the car and it wouldn’t start, and advice on what this could possibly be would be great.”source ↗
“My key fob has got to where it will not work after my car has sat for a while, like in the morning or when leaving work.”source ↗
“Lately I’ve had to manually unlock my car using the key, unlocking remotely does nothing. But then if I drive somewhere, my key fob starts working again and I can lock and unlock remotely.”source ↗
“I did notice my infotainment randomly system reset a couple times lately. My car sits on the street and it gets really hot where I live 100+ degrees. Would that affect anything?”source ↗
Where this came up
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