Q: My car won't shift up right away when accelerating hard

asked by on January 28, 2018

My car won't gear up when hitting the highway. I accelerate but will stay around 40-50 mph. When this happens an intermediate check engine light appears. I can slow down and the car will jump into the next gear and the check engine light will turn off. I drive a 2004 Grand Prix.

My car has 123000 miles.
My car has an automatic transmission.

To determine the exact cause of this issue, I would recommend having your trouble codes scanned by a qualified professional. If the check engine light is on, a code will be stored in your vehicle that can give an indication what might be wrong with the transmission.

Hi DJ. Thanks for contacting us today. There are a few possible reasons why your car is having this issue. First, a faulty shift solenoid will cause this to happen, as will an obstruction of debris in the transmission hydraulic lines, an inner seal failure or a worn or faulty torque converter. The intermittent check engine light could mean that this issue is due to a faulty sensor or electrical component within the transmission. This is something that is best diagnosed by a transmission specialist, so you should probably contact a local transmission shop to see what they can do to help in this case.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Horn not working properly, only when I lock the door or push the panic button.
Hi there. If the horn is working at all other times, except when you try using it with the horn button, then you more than likely have an issue within the connection of the horn button (https://www.yourmechanic.com/services/horn-does-not-blow-inspection). The contact inside...
Car overheating and shutting off
Hello, since the car is overheating, it should not be driven to avoid any further damage to the engine. The first thing that comes to mind is the engine drive belt missing. With the belt missing, the coolant pump is...
Car not shifting when running
You have not stated whether this is a automatic or manual transmission. This information would make a big difference. If the car is a manual then the most likely cause is a clutch issue. If the car is a automatic...
Vauxhall Astra CDTi 55 plate after driving the car for a while it will stop while i'm driving or not start up again after parking
There are many variables that come into play in a no-start situation, especially an intermittent one. Since you have already had some work done, we can rule those out. Since you are having to drive before the issue happens, I...
Rattling sound coming from front drivers side wheel well.
A rattling noise in that area can be a number of things including bad struts, timing chain issue, or bent suspension components. You should have the front suspension sway bar bushings or link arms inspected for loose or worn components...
Where is the fuel filter located ?
The fuel filter on this vehicle is located on the inside of the frame under a protective cover in the left rear of the vehicle just in front of the rear axle shock mounting location on the frame.
2012 Elantra - I'm changing #4 cylinder ignition coil but i'm not sure which one it is. Anyone know the cylinder order?
The No. 1 cylinder is the cylinder nearest the engine's crankshaft pulley. The No. 4 cylinder would be nearest the other end of the engine which is the flywheel (or flexplate) "end" of the engine. If you need assistance with...
Why does the the engine sound loud when you first start it up? Then it quiets, but as you drive you can still hear it on a Echo
Hi there. That is a very interesting situation you have with your BMW. To be honest, I've never seen tire valve stems cause any type of noise; especially under the conditions you're describing. It is possible that you may have...
Weird noise on start?
It sounds like you may have a starter solenoid that may not be working properly or that may be starting to fail. In some cases, the solenoid may malfunction causing the starter gear to not properly engage with the flywheel...

Related articles

Pontiac Certified Pre-Owned (CPO) Car Program
If If you’re in the market for a used Pontiac vehicle, you may want to check out cars under their certified pre-owned program. Many manufacturers have a certified pre-owned (CPO) program, and each one is set up differently. Read on...
Understanding the Pontiac Oil-Life Monitor and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Pontiac Oil Life Monitor (OLM) indicates when and what service your car needs.
How to Buy a Classic Pontiac
Whether you want to buy a classic Pontiac for yourself or as a gift, here are some tips on buying one for a great value.