Skip the auto shop - Our mechanics make house calls

Q: Speed control broken. 2005 Buick Terraza

asked by on

My speed control doesn’t work. So I had a certified General Motors dealer look at it. The steering switch was OK. The Engine Control Module was OK. And I even tried a new Engine Control Module, but it didn’t do any good. Do you have any suggestions or ideas as to how to fix this?

A: You may be having a problem with the thrott...

You may be having a problem with the throttle control actuator assembly not getting a signal from the ECM, or the actuator module is defective. The cruise control test with the dealer scanner can monitor all the inputs and outputs of the cruise control and should have been diagnosed by the dealer when you had them test it. If the ECM did not fix it, then the throttle control assembly may be the problem. Have the dealer test it again since you paid for the diagnosis. If you'd rather have it checked elsewhere, a certified professional from YourMechanic can come to your car's location to inspect the speed control.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: WCM module causing engine to lock up

Hello. I do not know of any WCM module that will cause the engine to lock up. If the engine is locked up, then there is a mechanic failure in the engine. I usually try spinning the engine over by...

Q: Battery replaced, fuel gauge stopped working

Hello. There are a couple of reasons that would cause the fuel gauge to stop working. The most common reason is that the fuel level sending unit has failed and is not accurately reading the fuel level. The fuel level...

Q: Back up camera comes on and off when my headlights are on

The navigation unit and power train control unit use some common sensors to know when you are in reverse to activate the backup camera. If your backup lights do not work or other problems are happening, then I suggest having...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...