The automatic transmission control unit (often designated as TCU or TCM) is a crucial electronic component responsible for smooth and trouble-free gear shifting. Its failure, most often caused by overheating, short circuits, or water damage, results in jerking, an inability to shift gears, or the vehicle entering limp mode. Purchasing a new module at an authorized dealership is a massive expense, which is why replacing it with a fully functional, used original is the most reasonable solution.
Automated Manual Transmission Control Unit Citroën C2 C3 Siemens S122754002D 9662746780 SIM821
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Product code: ECBD-10596
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Code 39:
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€650.41
Price
€650.41
€800.00
Price
€800.00
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Automated Manual Transmission Control Unit Citroën C2 C3 Siemens S122754002D 9662746780 SIM821
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Transmission Control Unit S122754002D – does it fit your Citroën C2?
This is a used, working Siemens automated manual transmission control unit with part numbers S122754002D, 9662746780 and SIM821. It fits: Citroën C2, C3 (SensoDrive gearbox). Before buying, compare the numbers with the label on the control unit in your car.
Automated Manual Transmission Control Unit Siemens S122754002D – Citroën C2, C3
An automated manual gearbox (SensoDrive) is a manual gearbox in which the clutch and gear changes are operated by actuators. The control unit (TCU) decides when to disengage the clutch and change gear and controls the actuators – the driver has no clutch pedal. This unit fits: Citroën C2, C3.
Part numbers to compare
- S122754002D – control unit manufacturer number (Siemens), on the label: S122754002 D
- 9662746780 – Citroën part number
- SIM821 – additional marking
The same numbers should appear on the control unit in your car. The car model alone is not enough – control units differ in software version and configuration.
Signs of a faulty transmission control unit
When the transmission control unit starts to fail, the most common signs are:
- inability to engage a gear or pull away,
- a gearbox or clutch fault message,
- jerky gear changes,
- no communication with the control unit in the diagnostic tool.
Before replacing it, check the battery and power supply – automated manual gearboxes are sensitive to low voltage – as well as the earth connections and connectors, and read the fault codes. After replacement, the gearbox usually needs an adaptation (including clutch bite point learning) with a diagnostic tool.
Frequently asked questions
| Which car does the S122754002D control unit fit? |
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| It fits: Citroën C2, C3. Before buying, compare the numbers with the label on the control unit in your car. |
| Which number should I compare? |
| Ideally all of them: S122754002D is the control unit manufacturer number, 9662746780 is the Citroën part number and SIM821 is an additional marking. You will find them all on the control unit label. |
| Does the control unit need programming after replacement? |
| Usually yes – after fitting, the gearbox is adapted (including clutch bite point learning) with a diagnostic tool. |
| What condition is this control unit in? |
| It is a used part in good working condition. The warranty period is shown in the product specification table. |
Not sure whether this control unit fits your car? Send us a photo of your control unit label and we will confirm compatibility.
