Renault Transmission Problems

Have troubles with your Renault transmission? Learn the most common problems of a bad Renault transmission and know the possible solutions to fix the problem.

This article will discuss some of the most common problems that affect Renault Clio, Scenic, Megane, Kangoo, and Trafic with automatic transmission. Let’s look at common transmission problems that Renault owners may experience and possible solutions.

Before You Blame the Transmission

1. Check the transmission fluid level and condition if your model has a check point. Low or old fluid causes harsh shifts and slipping.
2. Read the codes from the engine and transmission modules. Solenoid, pressure sensor and speed sensor faults are common on Renault automatics.
3. Check the battery and the transmission wiring connector. Low voltage or a corroded plug causes limp mode on many models.
4. After a repair or fluid change, many Renault automatics need their adaptations reset with a scan tool.

The YOUCANIC UCAN-II Pro reads Renault transmission codes and live data on supported models, which helps separate an electrical fault from internal wear. See our step by step guide to reading and clearing Renault fault codes.

Common Renault Transmission Problems

Banging during gear shifts

The older Renault with a four-speed transverse automatic transmission, DP0, has a fairly common gear shift issue. It will manifest as a harsh gear change combined with a loud bang.

More severe cases will trigger a ‘check gearbox’ warning on the dashboard. This problem usually appears only after the vehicle warms up and tends to be intermittent.

Possible causes

• Fluid leaks within the pressure regulator ensure the transmission fluid pressure is within specifications. This happens as the spring inside the regulator weakens, resulting in a loss of hydraulic pressure and harsh shifts. The solution to this problem is a new and upgraded regulator.
• Clogged lock-up solenoids obstruct their movement and cause delays during gear changes. The harsh engagement happens as a result of different speeds between gears.

Switching to limp mode

Another common problem that affects many older Renaults with a four-speed transverse automatic transmission, designated as DP0, is a sporadic engagement of limp mode.

In most cases, the car runs and shifts fine for several miles after startup but switches into limp mode as it warms up. With a ‘ Gearbox faulty ‘ dashboard warning, the transmission will stay in 3rd gear in this mode.

Possible causes

• Low transmission fluid level triggers a limp mode as a preventive measure to prevent damage caused by overheating and lack of lubrication.
• Faulty pressure modulation valve, causing increased differences in transmission fluid pressure during gear changes. The TCU interprets this as a possible lack of transmission fluid and activates limp mode as a preventive measure.

Rattling noise while accelerating

Several Renault models come with a Continuously Variable Transmission sourced from Jacto. These transmissions have a common problem that shows up as a whining or rattling noise. This may be intermittent or constant but usually happens only during acceleration. In some cases, there might be noticeable shaking. There will be no other symptoms or warning lights.

Possible causes:

• Broken or worn down pulley bearing, which is a fairly frequent issue with these transmissions. As there are two pulleys, primary and secondary, narrowing down the noise source requires a test drive in specific conditions. While coasting at speed, with the loudest noise, shift the transmission into a lower ratio. Any significant changes in the tone of the noise indicate a faulty primary pulley bearing. Otherwise, the problem is with the secondary pulley bearing. Replacing faulty bearings with aftermarket upgraded ones solves the issue.

Hard shifting

Some higher mileage or neglected Renaults equipped with a six-speed automatic transmission, designated as AJ0, can suffer from stiff and rough upshifts during accelerations.

Another symptom is a severe lurch from Neutral to Drive or Reverse. These symptoms might only occur in the beginning stages until the car reaches running temperatures and will not trigger warning lights.

Possible causes:

• Excessive wear inside solenoid valves causes fluid leaks and corresponding pressure drops. Also, mechanical wear can obstruct solenoid movement. The lack of smooth and controlled solenoid movements causes harsh gear shifts. Replacing all solenoid valves at once is the best solution.

Judder and rattle on idle or when shifting gears

Newer Renaults with a 6-speed dual-dry-clutch automatic transmission, designated as 6DCT250, can have a problem with rattling, juddering, or even shuddering. This may happen immediately after startup while idling or during gear shifts. In most cases,  this will come with a loud clattering noise.

Possible causes:

• Excessive wear and play within the dual-mass flywheel, causing a metallic rattle while idling. Check the flywheel condition and replace it if there is any movement between the plates.
• A worn dual-clutch assembly as a result of normal wear-and-tear. Although there are repair kits that allow partial repair, replacing the whole clutch assembly is usually the best solution.

These symptoms may affect Renault Clio, Scenic, Megane, Kangoo, and Rafic. More important than the Renault model is the transmission model. You must find the transmission model installed on your car to research and troubleshoot a Renault vehicle properly.

These are some of the most common Renault transmission problems based on the YOUCANIC team’s experience and research. It doesn’t mean that all Renault vehicles have transmission problems.

Frequently Asked Questions

Why does my Renault automatic bang when changing gear?

On the older DP0 four speed automatic, worn solenoids, low or old fluid and pressure regulation faults are common causes. Read the codes and check the fluid first.

Why does my Renault go into limp mode?

The transmission computer limits gears when it sees a fault, such as a solenoid, sensor or wiring problem, or low battery voltage. Read the codes to find the cause.

Do Renault automatics need adaptation reset?

Often yes, after a fluid change, valve body work or a new transmission computer. A scan tool can reset them.

Check these troubleshooting and repair guides for more help on your Renault.

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