The Dacia Logan MCV is affected by a known airbag issue where the driver’s airbag does not deploy in a collision due to an internal fault in the SRS system. This activates the warning light on your dashboard. The complete system switches off. On diesel variants there is an additional risk of fuel leakage, caused by a defective clip or pipe. This combination of safety problems makes it essential to carry out a targeted check for recalls and to perform preventive maintenance.
Why the driver’s airbag fails on impact
The Supplemental Restraint System (SRS) in the Dacia Logan MCV correctly detects in a collision that the airbag should deploy. However, the driver’s airbag remains inoperative. The cause lies in the airbag module itself, also called the SRS ECU. Due to internal faults, this electronic control unit loses its connection with the airbag network. The unit can also permanently store crash data after a light impact.
In practice, this means that your airbag warning light is constantly on or flashing. The system locks itself. Even diagnostic tools can no longer communicate with the module. This problem mainly affects Logan MCV models from the years 2013 to 2020.
Common causes of the fault
- Microcontroller in the SRS ECU fails due to electrical surges or temperature changes
- Capacitors, resistors or chips in the module become damaged by vibrations
- Crash data remains stored after a parking bump or kerb tap, causing the system to stay blocked
- Poor power supply or earth problems disrupt electronic communication
- Clock spring in the steering wheel wears and causes intermittent connection problems
Dacia models such as the Logan MCV and Lodgy use shared Renault technology. Acceleration sensors in the ECU sometimes mistakenly point to airbag faults. This can lead to false warnings but also masks real problems.
‘ Never ignore the airbag warning. ’
Recognise the symptoms before things go wrong
The most obvious sign is the airbag warning light that stays on or flashes irregularly. Some owners report that the light only appears after starting the engine, others see it immediately when switching on the ignition. In rare cases, the passenger airbag light also dims or switches off in an illogical way.
You can read out the car using an OBD scanner. Fault codes then appear indicating internal errors, sensor faults or ECU problems. The module no longer responds or shows messages such as “Control Unit Fault” or “Crash Sensor Signal Fault”.
Practical checkpoints you can inspect yourself
- Wiring under the front seats: loose connectors regularly occur after seat adjustment
- Steering wheel: listen for creaking while turning, which can indicate clock spring wear
- Dashboard: check whether warnings coincide with speedometer or fuel gauge malfunctions
- Recent collisions: even minor impacts can store crash data that blocks the system
Never ignore the airbag warning. Always scan fault codes first before you dismantle any parts. This prevents unnecessary damage to sensitive electronics.
Official recall and dealer solutions
Dacia has issued a recall for the driver airbag fault. This recall targets Logan MCV models where the airbag does not deploy on impact. The cause is an internal defect. The repair involves replacing the faulty module and is free of charge if your car falls under the recall.
Ask your Dacia dealer whether your registration number is listed in the recall system. Dealers can check this within a few minutes and will book an appointment if your car is affected. The repair takes a few hours and prevents life-threatening situations in a collision.
When you need a reset rather than a replacement
The ECU has stored crash data after a parking collision, speed bump impact or light knock. This is a common cause of airbag warnings. The system locks itself, but the hardware is often still fully functional. Instead of an expensive replacement, a professional reset of the module is then sufficient.
ECU repair specialists can erase the stored data. They then restore communication. This costs considerably less than a new module and in many cases provides a permanent solution. Only have this done by a specialist who is familiar with Dacia and Renault modules.
Diesel fuel leakage increases the risk
In addition to the airbag problem, diesel versions of the Logan MCV suffer from fuel leaks. The cause lies with a defective clip or pipe in the fuel delivery system. If a leak occurs, diesel can end up on hot engine components. This creates a fire risk.
Regularly check whether you can smell diesel around the engine or on your parking space. At the slightest suspicion, have the fuel supply inspected. Replacing the clip or pipe is a relatively minor job that prevents a major safety risk.
Combined safety risks with used cars
If you are considering a used Dacia Logan MCV, explicitly ask about the airbag recall status and any fuel leaks. Test all warning lights at start-up and pay attention to unusual smells. Request the service history and check whether previous owners have reported any complaints.
Before purchasing, have an independent APK (MOT-equivalent) inspection carried out, with specific attention paid to these known issues. A reassuring warning light can be a sign of incomplete repairs or overdue maintenance. A suspicious smell points in the same direction.
‘ Airbag systems are life-saving features that must operate flawlessly. ’
Repair options and cost comparison
There are several possible solutions for the airbag problem. If there is a valid recall, the dealer will fix it free of charge with a new module. If your car is not covered by the recall, you can choose between a new module, a refurbished module or a reset.
A new SRS ECU costs a few hundred euros, excluding labour. A refurbished module from a specialist often costs half that. Internal components such as capacitors and chips are repaired in the process. A reset for false faults caused by stored crash data can be done for less than one hundred euros.
Choose the right specialist
Not every garage is equipped for airbag diagnostics. ECU repair also requires specific knowledge and equipment. Look for a specialist with specific experience of Dacia and Renault modules. These specialists know the most common faults. They have the right diagnostic tools to restore communication with the SRS ECU.
Avoid cheap DIY solutions. Also do not simply switch off the warning light. Airbag systems are life-saving features that must operate flawlessly. A poorly executed repair can be fatal in a real collision.
Prevent problems with preventive maintenance
Internal faults are difficult to prevent. However, you can take measures to limit secondary causes. Keep the wiring under the seats clean and free from damage. Regularly check that connectors are properly secured, especially after adjusting the seats or deep cleaning.
Leaks in door seals, the windscreen or roof channels can cause moisture ingress into the ECU. Seal these leaks in good time. Moisture and electronics are a bad combination. They lead to corrosion and short circuits. At high mileages, have the clock spring in the steering wheel checked, especially if you hear creaking noises while steering.
Regular ECU scans keep you ahead
Invest in regular diagnostics using an OBD scanner. Ideally do this once a year or at every service. Many early faults are already visible before the warning light comes on. Early detection saves expensive replacements and keeps you safe on the road.
If you see persistent warnings or strange warning light behaviour, go straight to a specialist. Waiting often makes the problem more complex and more expensive. Airbag diagnostics are not suitable for DIYers. The risks of unintentional deployment and permanent damage to sensitive systems are too great.
On the Carnews website you will find extensive information on common problems with Dacia models. It also lists maintenance tips and recalls. Find out more about your car and stay up to date with important safety updates.
Frequently asked questions
The most common causes of an airbag fault on a Dacia Logan MCV are problems with the SRS ECU, such as loss of communication, failures of internal components or stored crash data that blocks the system. In addition, loose or corroded wiring and connectors (especially under the seats) and a worn or defective clock spring in the steering wheel are common. There are also known issues and recalls affecting the driver’s airbag, where it does not deploy in a collision. Moisture ingress, damaged sensors or software faults can also contribute to airbag malfunctions.
You mainly recognise a potentially faulty airbag by a constantly illuminated or flashing airbag warning light on your dashboard, sometimes in combination with other warning lights or irregular switching on and off of the passenger airbag indicator. Faults can also appear after adjusting the seats (loose plugs under the seats) or noticeable problems in the steering wheel due to a worn clock spring. As soon as the airbag light comes on, there is a strong chance that (parts of) the airbag system are not functioning. Legally you are usually still allowed to drive, but it is unsafe: have the car read out and repaired as soon as possible and avoid driving unnecessarily.
First have the SRS (airbag) fault codes read with an OBD diagnostic tool at a dealer or airbag/electronics specialist. Check whether there is an outstanding recall for the driver’s airbag and, if so, have this carried out free of charge by the Dacia dealer. Then have the cables and plugs under the seats, the clock spring in the steering wheel and the SRS ECU professionally checked and, if necessary, repaired or have the crash data reset. After the repair, test whether the airbag warning light goes out and the system is free of faults.
Yes, there are known recalls for the driver’s airbag of the Dacia Logan MCV, where the airbag may not deploy in a collision due to an internal defect in the SRS system. This often goes hand in hand with an illuminated airbag warning light and the system locking itself. There are also known points of attention such as problems with the SRS ECU, crash data that blocks the system, defective clock springs in the steering wheel and loose wiring under the seats. If in doubt, it is advisable to explicitly ask the dealer about any outstanding airbag recalls.
The estimated costs for diagnosing and repairing an airbag fault on a Dacia Logan MCV usually range between around €150 and €600, depending on the cause. A simple diagnosis and fixing loose wiring or a connector problem can stay in the region of €150–€250. Professional resetting or refurbishing of the SRS ECU (instead of replacing it) is usually around €200–€400. Full replacement of the ECU, clock spring or airbag module can approach €500–€600 or more, especially at main dealers.
You can sometimes check simple things yourself, such as inspecting the plugs under the seats or reading the fault code with an OBD scanner, but actual resetting or repair of the airbag/SRS system must be done by a specialist. A lit airbag light almost always means that the whole system (or parts of it) has been switched off and may not work in an accident. Incorrect “reset” attempts (for example using cheap software or fiddling with cables) can result in the airbags not deploying at all or going off unexpectedly. The safe and recommended advice is therefore: always have airbag faults professionally diagnosed and repaired.