Vehicle roll back in drive?

[fordgt]

I was on a relatively small incline today and stopped for a traffic light. I applied the brakes, but not “auto hold “. I was surprised that my truck was rolling backwards. Every other automatic transmission vehicle I have ever driven idle speed was enough to keep the vehicle from rolling backwards. Is that unusual?

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[Don Vandyke]

When I'm waiting for my garage to open mine rolls back. My Expedition did the same thing.

 

[Raptor1996]

Conservative stall speed torque converters do this. Think of it like the engagement point on a clutch. Modern vehicles have super light converter stalls for better economy.

 

[TurboRanger]

It should have Hill Start Assist my F150 had it

 

[AssolMarandy]

It is not unusual.
Some automatic transmissions do not have enough idle torque to hold on an incline.
The slope, vehicle weight, and engine tune can make it roll back.
Using the brake or “auto hold” is the safe way to stop this from happening.

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