What are the symptoms of a damaged valve body in the Tiida transmission?
2 Answers
The symptoms of a damaged valve body in the Tiida transmission include the car not moving in reverse, warning lights on the dashboard, electromagnetic valve failure alerts, and jerky gear shifts in forward gears. The transmission is one of the critical components of a car and requires timely repair when damaged. Below is a detailed introduction about automotive transmissions: Overview: The transmission is a device that changes the speed ratio and direction of motion, typically located between the clutch and the central drive. It can alter the torque, speed, and direction of motion transmitted from the driving shaft to the driven shaft under different working conditions. Gear-driven transmissions generally consist of a housing and several gears. Classification: Automatic transmissions have become mainstream internationally, primarily including AT, AMT, CVT, and DCT types. Early AT transmission systems mainly used 4AT. AT transmissions achieve automatic gear shifting through an electronically controlled automatic operating system. CVT is a true continuously variable transmission with fewer parts and a compact size. DCT has two clutches.
My Nissan Tiida has been running for over six years, and recently the transmission started acting up, which is quite annoying. Initially, it was rough shifting, especially in stop-and-go city traffic—hesitation and jerking from start to acceleration, with the engine revving up but the car not speeding up accordingly. After driving for a while, the shifting became even more jarring, like a sudden lurch forward during hard acceleration, which was quite startling. Once, while reversing downhill in R gear, it made a grinding noise and wouldn’t engage properly. After checking, I found out it was due to a damaged valve body causing unstable oil pressure, which affected shift response. As the symptoms worsened, fuel consumption increased, and the dashboard occasionally lit up with a yellow warning light. Cold starts were relatively smoother, but the issues flared up once the car warmed up. Later, after replacing the valve body during repairs, the situation improved. My advice is to fix it as soon as you notice the problem—don’t delay until other components wear out and cost you unnecessary money. Driving with such issues is not only unsafe but also frustrating.
