Q: Drive-by-wire throttle problem

asked by on

My car has a Drive-by-wire throttle problem. When I am coming to a stop at a stop light or stop sign the engine is doing about 2600 to 4000 rpms. When I depress the clutch the rmps don’t drop. When I shift to neutral the rpms stay at 2600 to 4000 rpms until I press on the accelerator with my foot. Then it drops back to idle. This is an occasional problem that happens. I never know when it’s going to occur. The problem is worse when the engine is at operating temperature. I brought my car to the dealership, and they updated the throttle mapping software. But that is all they have come up with so far. Do you think it could be a sensor in the car? What other ideas do you have?

Hello. The symptoms you describe may be caused by issues with the throttle body or with the idle air control valve. The drive by wire system controls an electric throttle body which feeds the engine air. If the throttle body has any issues, it can behave erratically and cause the high idle symptoms you are experiencing. A possible sensor that could also be producing these symptoms is the accelerator pedal position sensor. As its name implies, the accelerator pedal position sensor detects the position of the gas pedal, so that the throttle body can be opened accordingly. If the sensor has any issues, it can also cause the throttle body, and therefore engine idle speed, to behave erratically. As electronic engine performance symptoms can be difficult to pinpoint, a proper diagnosis is highly recommended.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Drive-by-wire throttle problem

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

Get a quote

What others are asking

Q: Safety belt and airbag warning lights on - 2010 BMW 538xi

The SRS system should have faults read out but based on your description, the seat mat sensor in the passenger is most likely the cause. The seat occupancy sensor is used in both determining air bag deployment and seatbelt pyrotechnic...

Q: When moving the shifter in reverse, it won't engage

Yes, your description is that of a common problem. The issue usually results from a clutch being out of adjustment. The adjustment that you likely need is known as the clutch actuator adjustment. To adjust the clutch, the technician must loosen...

Q: Car stalled out unexpectedly

Hello. This could happen for several reasons. Your car could have gone into a temporary limp mode because of transmission malfunction or because the battery and/or alternator has low voltage causing the car to stall. This problem should be addressed...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...