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chevygeorge, ASE Certified Technician
Category: Car
Satisfied Customers: 53
Experience:  GM Technician for over 25 years
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Driving down ll at speed ranging from 65 to 80 down ll and

Customer Question

driving down hill at speed ranging from 65 to 80 down hill and on need when applying bake the engine RPM SURGES from say from about 2800 rpm to 3500 rpm. Is this normal or some engine issue. This is noticed only when going down hill.
Submitted: 3 months ago.
Category: Car
Expert:  chevygeorge replied 3 months ago.

Hello my name is ***** ***** I'm here to assist you today. What is your make, model and year please?

Customer: replied 3 months ago.
2010 Honda accord LXP , automatic transmission
Expert:  chevygeorge replied 3 months ago.

Yes, this is perfectly normal. It's Honda's design. Here's Honda's official explanation.

Grade Logic Control
The Accord automatic transmission features Honda's Grade Logic Control system. This system differs from other computer-controlled shift programming because it can detect vehicle driving situations and then set appropriate shift points for the car. This feature avoids gear hunting on climbs and descents, and downshifts when appropriate for added engine braking.

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