Shudder at 18 mph when slowing

Asked by Jgoniwicha Apr 30, 2019 at 08:24 AM about the 2008 Pontiac Grand Prix GXP

Question type: Maintenance & Repair

I have a 2008 Pontiac Grand Prix GXP with a
5.3 L engine. When I am slowing down every
time my car hits approximately 18 miles an
hour there is a shutter felt in the petals as
well as the steering wheel and the
floorboards of the vehicle. It then stops when
you’re at about 10 miles an hour Ors I have a
2008 Pontiac Grand Prix GXP with a 5.3 L
engine. When I am slowing down every time
my car hits approximately 18 miles an hour
there is a shutter felt in the petals as well as
the steering wheel and the floorboards of the
vehicle. It then stops when you’re at about 10
miles an hour or so.   Brakes have been
changed axles have been changed
transmission had to be replaced any ideas
with this could be?

4 Answers
26,865

taver91 answered 5 years ago

Agree with FOR. Look into the trans downshift as the problem. If the trans swap was recent, I would take it to the shop that did the work. If not, start by checking the fluid level and go from there. Good luck.

1 people found this helpful.
Mark helpful

Jgoniwicha answered 5 years ago

This is not the transmission downshift that is being felt this is a very distinct shutter at the same speed’s consistently fluid is fine valve body is fine transmission is working 100% When the electronica fuel management system sensor was unplugged that shutter went away you plug it back in the shed or comes back however it is not throwing any codes

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