Renault EDC fault codes: DTC numbers and DF codes explained (Captur, Clio, Mégane)

Renault EDC fault codes come in two formats: Renault’s own DF codes (such as DF433, DF437 and DF489) and long six-digit DTC numbers (such as 174311, 174401 and 189412). Both usually describe the same fault, in the circuit of a clutch motor or a shift drum motor. In practice, the most common cause is the TCU, the gearbox computer.

That is why you find so little online about your code. Search for DF433 and you land on different pages than when you search for 189412, while the mechanic is looking at the same gearbox. This page puts the DTC numbers and the DF codes of the Renault EDC side by side, with what is and is not known about each one. It is written from the workshop of ATR Transmissies in Montfoort, where we diagnose and repair these dual-clutch gearboxes.

What are DF codes and DTC numbers on a Renault?

DF codes are Renault’s own fault numbers. DF is usually read as short for défaut, French for fault. Renault’s dealer diagnostic tool, Renault CLIP, shows codes in this form, and many generic testers do too once you select the Renault protocol.

The six-digit DTC number is the format you mostly see on generic diagnostic equipment. It is not a random number. Modern diagnostic protocols store a fault as three bytes, usually written as six characters (background on 3-byte DTCs). The first four digits match the P-code of the fault. The last two are a failure type, such as a short circuit to earth or an unidentified electrical failure. So 174311 belongs to P1743 and 174401 belongs to P1744.

You see this on the lift all the time. The same Renault can show P1743 on one tester and 174311 on another, with a description that is translated slightly differently. Both point to the same circuit.

Renault EDC fault codes table: DTC numbers and DF codes side by side

The table below lists the DTC numbers people search for most, with the DF code that carries the same description. Note: this is a match on description, not an official one-to-one translation. Renault uses its own variants per model and software version, and scan tools translate descriptions differently.

Is your code in one of the “readout needed” rows? That is not bad news. It only means the number says nothing without the description from your tester and without live data. A shift drum, by the way, is the rotating drum that moves the selector forks to engage the gears; the clutch motors open and close the two clutches.

The DF codes of the Renault EDC at a glance

Each code group has its own detailed page: DF437, DF439, DF432 and DF433 for the shift drum and DF489 and DF490 for the clutches. Looking for the P-code version? See P1743 or P1744 and P1899. The full overview for this gearbox is on the page with all Renault EDC fault codes for the DC4 and 6DCT250.

Why one fault can produce several different codes

A fault code is an address, not a diagnosis. It tells you in which circuit the computer measured something abnormal, not which part is broken. That is why one defect can put several codes in the memory at once.

Say the control of clutch 1 drops out. The gearbox logs a fault in the clutch circuit, but it then also sees that a gear is not reached. Suddenly there are four or five codes stored, spread over the clutches and the shift drums. Do not replace a part per code in that situation. Look at the pattern.

The names add to the confusion, because this gearbox is not called the same thing everywhere. Renault calls the automatic EDC (Efficient Dual Clutch). Internally it is the DC4, Getrag (now part of Magna) calls it the 6DCT250, and Ford uses the same family as the DPS6, better known as the Ford PowerShift. Several names, one six-speed gearbox with a dry dual clutch.

One more thing to know: “EDC” is not a single gearbox. Renault also uses wet, oil-bathed dual-clutch versions under the EDC name, such as the six-speed DW6 and the seven-speed DW5, mainly in larger and more powerful models (overview of EDC versions, in French). The codes on this page belong to the dry DC4, the version in most Captur, Clio and Mégane models. If you are not sure which one your car has, the gearbox type on the identification plate or a full readout settles it.

TCU failure on the Renault Captur: the gearbox computer as the usual cause

The TCU (transmission control unit) is the computer that controls the EDC gearbox. On the Renault Captur and the other models with this gearbox, the TCU is supplied by Continental and is mounted directly on the transmission. That is the main reason it fails: for years it shares the heat and the vibration of the gearbox.

At ATR, we trace most of these codes back to internal connections that have broken inside the unit. The control of a clutch motor or shift drum motor then drops out. The gearbox measures that nothing happens, stores a code and goes into limp mode as a precaution.

That is also why we measure before we replace anything. The same codes can come from a motor, a connector or the wiring, and only measurements on the circuit plus live data show which one it is in your car.

Why the car drives again after you restart it

Switch the ignition off and on again and the electronics reset, so the gearbox starts without an active fault. For a moment, it looks fixed. The cause is still there, though, so the warning comes back, usually at shorter and shorter intervals. That on-and-off behaviour is typical of a TCU with an internal break, and it is not a reason to wait and see.

Why a second-hand TCU will not work

The TCU of the DC4 and 6DCT250 has a software lock. Fitting a used unit from a breaker’s yard therefore does not work: without the right software and coding, the car simply will not accept it. A replacement TCU needs software support. ATR keeps this unit in stock and supplies the software with it. There is more background on this control unit in our article on the TCM and TCU.

Symptoms that go with these codes

Renault EDC faults produce very similar complaints, whichever number your tester shows:

• limp mode, with the gearbox stuck in one gear
• a “Check auto gearbox” or “Check gearbox” warning on the dashboard
• the car will not move off in D or R, while the engine runs normally
• jerking when pulling away, or gears that drop out
• normal driving again for a while after a restart

Renault’s own owner’s manual says that a “Check gearbox” message while driving indicates a fault and that you should contact a dealer as soon as possible (Renault user manual, automatic gearbox). A “Gearbox overheating” message is different: then you stop as soon as it is safe and let the gearbox cool down until the message disappears.

Slipping or juddering when you pull away is not automatically an electronic fault. It can also point to wear of the dry clutches, a known weak spot of this gearbox. Both problems can be present at the same time, and that is exactly why reading codes alone is not enough.

Which Renault and Dacia models have this gearbox?

The dry six-speed EDC is fitted to, among others, the Renault Captur, Clio, Mégane, Scénic and Kangoo, and to several Dacia models with the same automatic. In the Netherlands, the Captur and the Clio are by far the most common ones we see. Exact fitment depends on engine and model year, so check the gearbox type before you order anything. Looking for a code on another make or gearbox type? See the wider overview of transmission fault codes.

What to do when you read one of these codes

The right order of work saves you parts you did not need:

1. Write down every code in the memory, not just the first one. Add the exact description your tester gives and whether each fault is active or stored. That combination says more than a single number.
2. Check the battery and the charging voltage. Renault’s manual notes that an electrical fault in the battery can affect the automatic gearbox, and low voltage makes gearbox electronics behave strangely.
3. Do not clear the codes straight away. Clearing removes the warning but not the cause, and you lose the information needed to recognise the pattern.
4. Measure the circuit and look at live data while the gearbox shifts. Only then can you see whether the TCU, a motor or the wiring is to blame.
5. Repair what the measurements point to, and then test drive with the tester connected to confirm the fault stays away.

Not sure the gearbox is the real problem? Find out what your symptom could mean in our overview of gearbox symptoms.

For garages

Garages that want a second opinion on a Renault EDC do not have to send the car. With ATR Remote, we read the transmission remotely and tell you honestly whether a targeted repair is enough or whether more is going on.

Repair options and what determines the cost

With these codes, a targeted repair is usually enough. In most cases it comes down to replacing the TCU with the matching software and, where needed, repairing a clutch motor, a shift drum motor or the wiring. A full gearbox overhaul only comes into the picture when the diagnosis also shows mechanical damage, such as worn clutches.

What it costs depends entirely on what the diagnosis finds. The main factors:

• whether only the TCU is faulty or the clutches or shift mechanism also need work
• the gearbox version and software of your specific car
• whether the gearbox has to come out for the repair
• how long the car has been driven with a recurring fault

A TCU alone is a different job from a repair where the clutches are also done, so we do not name a figure before we know what is going on. Contact us for a price indication based on your registration number and complaint. Keep in mind that driving on with a recurring fault makes the repair bigger, because the clutches and shift mechanism take a beating in the meantime.

FAQ about Renault EDC fault codes

Is DTC 174311 the same as P1743?

They point to the same area. 174311 belongs to P1743, and both are about the circuit of the clutch 1 motor. The last two digits of the DTC number give the failure type, in this case a short circuit to earth. Which format you see depends on your diagnostic equipment, not on the car.

What does the “Check auto gearbox” warning mean on a Renault?

It means the gearbox computer has detected a fault and stored a code. It does not tell you which part is faulty. On the dry EDC, the cause is often the TCU, but a clutch motor, wiring or low battery voltage can give the same warning. Have the codes read before anything is replaced.

What are common problems with the automatic gearbox in a Renault Captur?

On the Captur with the dry six-speed EDC, the problems we see most are TCU faults with “Check auto gearbox” and limp mode, and wear of the dry clutches, which shows up as juddering or slipping when pulling away. The two can occur together, so a diagnosis with live data is needed to separate them.

Can I keep driving with a Renault EDC fault?

A short distance in limp mode is possible, but driving on is not wise. The gearbox can suddenly stay stuck in one gear, which is unsafe in traffic, and you risk follow-up damage to the clutches and the shift mechanism. Have the code looked at soon; acting early keeps the repair small.

Does it help to clear the fault code or reset the EDC?

Only temporarily. Clearing removes the warning from the memory but does nothing about the cause, so the code comes back. Worse, you throw away the information needed for the diagnosis. Always write the codes down before anyone clears the memory.

Can I fit a used TCU from another Renault?

No, not as a plug-in swap. The TCU of the DC4 and 6DCT250 has a software lock, so the car will not accept a used unit without the right software and coding. A replacement TCU needs software support from the start.

Is the Renault EDC the same as the Ford PowerShift?

The dry six-speed EDC (DC4) and the Ford PowerShift DPS6 both belong to the Getrag 6DCT250 family. The software, the TCU and parts of the hardware differ per make, so a part number or fix for one make does not automatically apply to the other.

My code is not in the table. What now?

That happens more often than you would think, because this gearbox has dozens of variants per model and software version. Send us the complete readout report with all codes and the descriptions your tester gives. From the combination, we can usually see quickly which part it points to.

Renault EDC fault code? Start with the full readout

Renault EDC fault codes such as 174311, 174401 and 189412, and the DF codes DF432 to DF490, almost all point to the same thing: the circuit of a clutch motor or a shift drum motor in the dry dual-clutch gearbox, with the TCU as the most common cause. A number you cannot find anywhere does not mean nothing can be done. It means the gearbox needs to be read and measured.

Do you have one of these codes on your Renault Captur, Clio or Mégane and want to know where you stand? Book your car in with ATR Transmissies in Montfoort. We start with a diagnosis, explain what we found and only then advise on a repair.