What Causes Transmission Failure in Peugeot 508?
3 Answers
Difficulty in shifting gears, automatic transmission jerking, and abnormal noises from the transmission, etc. Here are the detailed explanations: 1. Difficulty in shifting gears: Symptoms include jerking sensations, difficulty or resistance when engaging, disengaging, or changing gears during startup or driving, as if something is obstructing the movement, accompanied by jolts, vibrations, and jerking. Sometimes, shifting gears is easier when the car is cold but harder when it's warm, leading to significant discomfort. Cause: Insufficient lubrication of related gears and components inside the transmission, failing to form a lasting lubricating film, hindering smooth operation. 2. Automatic transmission jerking: Symptoms of impact sensation (valve body failure) include lack of power during startup, noticeable jolts and jerking at low or medium speeds, with the tachometer needle fluctuating on the dashboard; during high-speed driving, sudden acceleration causes the car to slip, the tachometer needle to rise rapidly, and a distinct impact sensation; shifting from P to R or D gear results in noticeable impact and jerking. Cause: Contaminants inside the transmission clog the valve body, impeding its movement and disrupting the sequential adjustment of oil pressure, leading to jerking and shifting impact faults. 3. Abnormal transmission noises: Symptoms include loud noises during idling, driving, or under high load, with the transmission producing abnormal or even very loud noises, and irregular, dull sounds during gear shifting. Cause: Dirt inside the transmission, wear or severe wear of bearings, gears, or other components, or damage to the gear sides.
I've been driving a Peugeot 508 for several years, and the transmission issues are quite annoying. Common causes include aging or leaking transmission fluid, which increases internal component friction; faulty sensor modules, such as a malfunctioning computer board failing to detect temperature; frequent hard acceleration causing excessive gear wear; clogged cooling systems leading to high oil temperatures; and aging seals causing fluid leaks. A friend of mine had a similar issue—sudden jerking while driving, costing over 5,000 yuan to replace the valve body. It's advisable to change the fluid every two to three years, drive gently, and not ignore unusual noises or shifting problems. Early intervention saves money and ensures safety.
I think the failure of the 508's transmission is mainly due to inadequate maintenance. Dirty fluid not being changed in time can cause gear jamming; the electronic control unit can get damaged by moisture; high-speed driving or excessive load can strain the clutch plates; some models have design flaws with seals prone to leakage; even unbalanced tire pressure can affect transmission performance. Last time my car broke down on the road, the dashboard alerted me to low fluid levels, and I fixed it by topping up the fluid. I remind car owners to regularly check the fluid and filters and drive smoothly to reduce faults by half.
