Q: Transmission works until engine warms up then the rpms jump and transmission won't change gears could it be the IAC? 03 cavalier

asked by on November 19, 2017

My 03 cavalier is having problems with the transmission not catching gear after the car has warmed up. When it first starts it runs good then it warms up and the rpms jump without me putting my foot on the gas could the transmission not catch because of the rpms which could be caused by the IAC going bad or is the transmission just shot?

My car has 160000 miles.
My car has an automatic transmission.

The idle air control valve will not affect transmission shift points. The throttle position sensor might though and there are other transmission controls, including electrically controlled solenoids in the transmission valve body, that might be at issue. It first has to be determined if this is an engine issue, transmission issue, or something involving engine sensor outputs that determine shift points. Such a determination can only be made with on-site testing and test driving the car. If you want a certified mechanic from YourMechanic to resolve this, the relevant service to request is a transmission shift diagnostic. If you request that service, the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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

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

Overheating.

Hi There, This can be caused by a number of things such as low coolant levels, a faulty thermostat, a clogged radiator or a failing coolant fan switch. The coolant fan switch helps to maintain the proper coolant temperature by...

Turns over won't start. 2000 Chevy Metro

Hello. Sometimes there are torque specs that are required for tightening the rod bearings. If they are too tight or too loose, it could prevent the car from starting. I would check a Chilton Manual for the proper specs for...

car wont start

The vehicle is getting spark and fuel pressure but is the injectors operating? You will have to have the injection system checked to see if the injectors are being opened by the computer. I have seen these cars get spark...

Related articles

A Buyer’s Guide to the 2012 Chevrolet Silverado
While While the Ford F-150 is still the best-selling pickup truck in the US, the 2012 Chevrolet Silverado is one of the finest half-ton pickups available today. In fact, the Silverado and the GMC Sierra are actually the same vehicle...
The Best Used Cars to Buy If You Just Retired
Here’s Here’s a cruel, hard fact – car manufacturers no longer target seniors. Instead, they devote their time and energy to appealing to the 18-45 demographic. Still, some features make certain cars more suitable for older drivers. We have...
Essential Things to Know About the 2017 Chevrolet Bolt Electric Car
The 2017 Chevrolet Bolt is the first all-electric car under $50k. The Chevy Bolt has a higher EPA rating than Tesla and gets 238 miles per charge.