Compact on the outside yet surprisingly spacious inside, the Daihatsu Sirion showcases Japanese expertise in space optimisation. Reliable, economical, and — unusually for its size — available in 4x4 form, this small city car is built on a simple, proven design. That said, no vehicle is immune to transmission problems. EDEN BOITES is here to help you diagnose and repair the gearbox of your Daihatsu Sirion, whatever the generation.
How do I find the reference number for a Daihatsu Sirion gearbox?
Born out of a technical collaboration with Toyota, the Sirion shares certain technologies and components with the Yaris. Launched in 1998, it was offered with a 1.0 L 70 bhp petrol engine paired with either a manual or automatic gearbox. In subsequent years, a 4x4 version appeared, followed by a 1.3 L 91 bhp unit. In 2005, the second generation received a mild facelift and a new 1.5 L 103 bhp engine, before the brand ceased selling new vehicles in Europe in 2013. Several dozen variants were produced over the years, with differences depending on the engine — so knowing your reference number, stamped on the casing, is essential to ensure the correct part is fitted.
Which gearboxes does the Sirion use?
Three types of transmission were fitted to this city car throughout its production life.
1. 5-Speed Manual Gearbox
The driver selects the desired gear via a lever, which operates selector rods connected to the gear set. The gears rotate at different speeds and transmit engine torque to the wheels through the driveshafts.
2. 4-Speed Automatic Gearbox
This gearbox relies on a torque converter and a hydraulic system. The driver selects the desired position (D, N, R, etc.), and the mechanism manages gear changes according to engine speed, road speed and load.
3. Continuously Variable Transmission (CVT)
A metal belt and two variable-diameter pulleys continuously adjust the transmission ratio, delivering smooth, seamless acceleration. For a deeper look at the differences between these gearbox types, see our guide on the differences between manual and automatic gearboxes.
What are the common faults on the Sirion?
Any change in behaviour should be taken seriously, as an unusual sign can be an early warning of a fault.
On manual gearboxes
- Difficulty selecting gears: the clutch, selector linkage, synchromesh rings, gears or flywheel may be at fault;
- Abnormal noises: grinding, whining or howling points to worn bearings, gears or the differential;
- Gearbox oil leak: this leads to insufficient lubrication and premature wear of internal components.
On automatic gearboxes
- Juddering during gear changes: the torque converter, valve body or solenoid may be involved;
- Gearbox slipping: often linked to the torque converter, valve body or worn clutch plates;
- Electronic faults: warning lights illuminated, error codes stored by the ECU, erratic operation;
- Oil leaks: as with manual gearboxes, these compromise lubrication.
At the first sign of any of these symptoms, consult a qualified mechanic — an accurate diagnosis prevents more serious damage and a more costly overhaul.
How do I repair a Daihatsu Sirion gearbox?
In many cases, a simple gearbox oil change is enough to resolve the issue. If the fault is more serious, a full replacement may be necessary. Sourcing a second-hand unit in isolation is a gamble and offers no reassurance if the part turns out to be incompatible. EDEN BOITES offers a reliable alternative: as specialists in both checked used gearboxes and exchange gearboxes, we support you from identifying your model right through to delivery. If your reference is not in stock, we can also fully recondition your existing gearbox using quality OEM-grade parts. Other models in the range have their own dedicated guides, including the Daihatsu Terios gearbox and the Daihatsu Copen gearbox.
Frequently Asked Questions
How do I know which gearbox my Sirion has?
The reference number stamped on the casing will tell you whether it is a manual, automatic or CVT gearbox, and ensures the replacement part is compatible.
My Sirion slips under acceleration — what could be causing it?
On an automatic gearbox, slipping is often caused by the torque converter, the valve body or worn clutch plates. An accurate diagnosis is essential.
Can an oil change be enough to fix the problem?
In minor cases, yes. But where wear is confirmed, an exchange unit remains the most reliable long-term solution.
Do you stock gearboxes for the 4x4 versions?
Yes, our range covers the various engine and transmission configurations of the Sirion. Identifying your reference number guarantees a perfect match.
Why choose EDEN BOITES?
EDEN BOITES brings its expertise in reconditioned gearboxes to your Daihatsu Sirion. Our exchange gearboxes come with a warranty of up to 24 months and can be paid in up to 10 instalments. Delivery is available throughout France and the European Union, within the timeframe confirmed on your quote. Our exchange offer is also available on a satisfaction-or-money-back basis, subject to our Terms and Conditions, so you can get back on the road with complete peace of mind.
