What would cause my cars rpm to drop when driving around 55mph?

Asked by Nov 18, 2015 at 08:42 AM about the 2006 Pontiac Grand Prix

Question type: Maintenance & Repair

While driving, when I hit around 55 mph my
rpm will suddenly drop down for a split
second then resumes as normal. At least
that's how it started, then one day while
driving my rpm just dropped and lost all
power and will not start back up. It has a
clicking while trying to start it but it will not
turn over.

5 Answers

111,735

See if you can have the car read for any codes to help see what the issue may be...

2 of 2 people found this helpful.

They did a diagnostic on it but not sure about the codes. They're saying it's the pcn computer?

Just really frustrated, it's been broke down for about a month now. I feel like I'm getting the run around. First they told me it was just the computer and now it's the pcn computer. Is there a difference? And would that mess with the rpm? I don't remember no warning lights coming on when it lost power while driving down the road. It still had lights on in the vehicle,but would just click and not start.

82,785

It may be a fuel supply problem but it also could be lack of spark. You may need to replace the fuel filter.

4,385

Do you have an actual shop working on your car? A competent repair shop will check for codes, tell you what they found and what they mean and give you some sort of a price estimate or quote on what the repair will cost. If that's not what you're getting I'd suggest trying a different shop. I could be a lot of things. Don't start throwing parts at it hoping for a miracle. Spend a few dollars on some proper diagnostics.

1 of 1 people found this helpful.

Your Answer

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,579 nationwide Grand Prix listings starting at $1,450.

ZIP:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,460
  • #2
    Tom Demyan
    Reputation
    3,070
  • #3
    munron
    Reputation
    2,490
View All

Related Models For Sale

Used Chevrolet Impala
553 Great Deals out of 35,106 listings starting at $1,495
Used Dodge Charger
354 Great Deals out of 30,281 listings starting at $2,000
Used Pontiac Bonneville
463 listings starting at $3,499
Used Chevrolet Monte Carlo
7 Great Deals out of 1,212 listings starting at $1,488
Used Pontiac Grand Am
1,033 listings
Used Pontiac GTO
9 Great Deals out of 490 listings starting at $5,995
Used Pontiac G6
58 Great Deals out of 3,829 listings starting at $1,250
Used Ford Mustang
556 Great Deals out of 36,548 listings starting at $1,500
Used Chevrolet Malibu
1,050 Great Deals out of 63,769 listings starting at $880
Used Chrysler 300
344 Great Deals out of 18,762 listings starting at $900
Used Nissan Maxima
320 Great Deals out of 22,465 listings starting at $1,200

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
11 Great Deals out of 389 listings starting at $1,500
2007 Pontiac Grand Prix For Sale
368 listings starting at $2,295
2006 Pontiac Grand Prix For Sale
3 Great Deals out of 430 listings starting at $3,200
2005 Pontiac Grand Prix For Sale
333 listings starting at $1,450

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.