What are the symptoms of a faulty transmission control module in the Envision?
3 Answers
Performance when the Passat transmission control module fails: Difficulty in shifting gears, gear slippage, and gear lock-up. This mainly applies to manual transmission models where gear shifting becomes impossible when the clutch is depressed, whether upshifting or downshifting becomes difficult. Additional information: Gear lock-up: This means entering a protection mode. When a fault occurs in the transmission, the computer can detect it. At this point, the computer locks the transmission in third or fourth gear to alert the owner that the vehicle should no longer be driven. Gear slippage: In a normally functioning transmission, when the car is stationary, the transmission gear remains in the specified gear or the gear designated by the computer to maintain a certain RPM range until the computer initiates a gear change. However, if the transmission gears automatically slip, the car can spontaneously jump out of the drive gear and shift into neutral.
When driving my Envision, I encountered a transmission control module failure with quite noticeable symptoms: severe jerking during gear shifts, as if the car suddenly got stuck; dashboard warning lights like the check engine or transmission warning light would frequently illuminate; sluggish acceleration response, feeling powerless when stepping on the gas, accompanied by a sharp increase in fuel consumption. The worst incident happened on the highway when the car went into limp mode, forcing me to drive at a very slow speed—it was almost dangerous. Later, I took it to the dealership for inspection and found the module was faulty. It cost me 1,500 RMB to replace it with a new one. A word of advice: don’t delay if you notice these signs—timely repairs can prevent worse damage, and regular transmission fluid maintenance can help avoid such issues altogether.
As someone who frequently repairs cars, I know that the symptoms of a faulty transmission control module in the Envision include rough shifting, delays, or complete failure; constant illumination of dashboard warning lights such as the P0700 error code; the vehicle often entering limp mode, limiting speed to around 40 km/h; and there may also be jerking or interrupted acceleration. When diagnosing, it's important to use an OBD scanner to read the fault codes, then check the wiring connections and power supply for normal operation. The solution is to replace the module and perform programming and matching, a job that requires professional equipment—it's best to go to an authorized shop to avoid damaging more components. The repair cost generally ranges from 1,000 to 2,000 yuan, depending on the source of the parts.
