
My car is stuck in one gear and won't shift
This is usually limp mode. The computer saw a problem it does not trust, so it holds the transmission in one gear to protect it and get you off the road. The cause can be as small as a failed sensor, a wiring fault, or a solenoid, or it can be low fluid or overheating, and a scan plus a few tests tells us which.
What to do right now
- 1Drive slowly and only to the shop or home. Limp mode is meant to get you off the road, not through the rest of your week.
- 2Stay off the highway and do not pull a trailer. One gear is not enough to merge safely.
- 3Do not clear the code and keep driving. The stored code and the moment it set are what point us to the cause.
- 4If it smells burnt, a transmission temperature warning comes on, or it starts to slip, pull over and have it towed.
What it usually is
Transmission diagnostics
We read the transmission computer, not just the engine, then test the wiring, sensors, and solenoid the code points to. Sometimes it is electrical and nothing inside is hurt.
See the serviceTransmission repair
A failed shift solenoid, a speed sensor, or a valve body problem gets fixed on its own. On many transmissions the solenoids sit under the pan and can be replaced without taking the transmission out.
See the serviceTransmission fluid service
Low fluid, or fluid cooked by overheating, can trigger limp mode. We fix the leak or the cooling problem, refill with the right fluid, and check the old fluid for signs of wear inside.
See the service