A faulty transmission control module (TCM) most often causes limp mode with the gearbox stuck in one gear, harsh jolts when you select D or R, erratic gear changes, flashing PRND letters and a gearbox or engine warning light. However, the same symptoms are often caused by a low gearbox oil level, a weak battery, a poor earth or a faulty sensor. To test a transmission control module, start by checking the battery and reading the fault codes with a diagnostic tool that can talk to the gearbox control unit, then check the power supply, the connector, the oil and the live data. Below we explain the symptoms, the diagnostic steps and what the most common fault codes mean.
Engine control unit Mercedes Siemens A2661530291 A0024463040 5WK90973
Vendors's code: A2661530291
Product code: 776F-3197B
Barcode:
Code 39:
ISBN:
€284.55
Price
€284.55
€350.00
Price
€350.00
Select a product option:
Individual variants may differ in price
product option
Important: Depending on the ECU type and vehicle model, not all of the options listed below may be available.
To select the correct option for your vehicle and ECU, please contact us before purchasing:
contact@auto24parts.com
1. Locked
This option is intended for professional workshops with the required specialist equipment and technical knowledge.
The ECU has been removed from a vehicle intended for recycling and still contains the immobilizer data and other information from the previous vehicle. Before it can be used in another car, it must be unlocked and then programmed using specialist automotive diagnostic equipment.
2. Unlocked
Several preparation methods may be available. The possible options depend on the ECU type, vehicle model and immobilizer system. Please contact us before purchasing, as some preparation methods are not available for every ECU.
Our electronics specialists can prepare the ECU in one of the following ways:
a) ECU with PIN code (Car Pass)
The PIN code is supplied, but programming with a suitable diagnostic tool is still required. After installing the ECU, it must be reset using the supplied PIN code and then programmed to the vehicle’s immobilizer system.
b) VIRGIN ECU
The data from the previous vehicle is removed and the ECU is restored to a clean, factory-like state. After installation, it must be programmed to the vehicle using a compatible specialist diagnostic tool. Unless another preparation method is specified in the product description, this is the standard unlocking option for most of our ECUs.
c) Plug & Play – IMMO OFF
The immobilizer function is disabled in the ECU. After installation, the engine can start without additional immobilizer programming. Please note that the vehicle will no longer have an active immobilizer function, and an immobilizer warning light or fault code may remain, depending on the vehicle model.
d) Plug & Play – Automatic Programming
After installation, the ECU automatically learns and saves the required vehicle data. No additional programming is normally required.
e) Plug & Play – 1:1 Clone
The data from your original ECU is copied to another fully functional ECU. The cloned unit is then ready for installation without additional programming.
You must send us your original ECU so that we can transfer its data to the replacement unit.
The original ECU must have working communication with the vehicle, a diagnostic tool or our programming equipment. If the required data cannot be read, a complete 1:1 clone may not be possible.
3. Complete Plug & Play Set
A complete matched set containing the ECU, immobilizer components and all other parts required to start the vehicle without additional programming. All components supplied in the set must be installed in the vehicle.
Important:
Dispatch time depends on the selected option. If an unlocked or specially prepared version is ordered, the preparation service usually requires an additional 1–2 business days.
Ask about the product
Engine control unit Mercedes Siemens A2661530291 A0024463040 5WK90973
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Shipping
from
€30.00
-
shipping
(Poland)
from
€30.00
-
shipping
(Poland)
Price 30 euros applies shipments to 5 kg on worldwide. Above this weight, please contact us by email to check price
Shipping cost for the selected product
The shipping cost applies to this product (in the selected variant - if applicable). It may change after adding other products to the cart.
Will engine control unit A2661530291 fit your Mercedes?
Engine control unit A2661530291, used and inspected. Compare the numbers with the original in your car.
Where to find number A2661530291 on an engine control unit?
This control unit is made by Siemens. Engine control unit A2661530291 is used and original, and it is matched by its numbers, not by the car model alone. The listing does not state the car model or year, so we do not give them in the description and match the part by its numbers.
Numbers to compare
You will find the numbers on the label of the control unit, while catalogues list them as a single string:
- A2661530291, car manufacturer's original number,
- A0024463040, car manufacturer's original number,
- 5WK90973, control unit manufacturer's number.
Matching by number is more reliable than matching by car model. Compare all the numbers and ask us if any of them does not match.
Control unit variant
This listing is for a control unit in the following variant(s): Locked / Unlocked. We describe the differences between the variants (locked, unlocked, Virgin, IMMO OFF, Plug and Play, clone, full set) on the ECU preparation options page. Before buying, send us the numbers from the label and we will confirm which variant is available for that number.
Symptoms of a faulty engine control unit
- the car loses power or goes into limp mode,
- fuel consumption rises for no obvious reason,
- the radiator fan or other electrical components do not work properly,
- the engine jerks when accelerating.
Before buying a control unit, read the fault codes with a diagnostic tester and check the power supply, the earth connections and the connector. Damaged sensors, wiring or fuses can cause similar symptoms, and in that case replacing the control unit will not help.
Questions and answers
| Where do I find number A2661530291 on my control unit? |
|---|
| The numbers are on a sticker or printed on the housing of the control unit. Take a close-up photo of the label in good light so that all the characters can be read. |
| Who makes this control unit? |
| The control unit is made by Siemens. The manufacturer's name does not change the numbers you should use to match the part. |
| What should I do if the ending of my number is different? |
| The ending of a number often indicates a different version of the control unit, so do not order the part without confirmation. Send us the number from the label on your control unit. |
| What condition is this control unit in? |
| It is a used original part, inspected before sale. You will find the warranty period in the product features table. |
Want to check before you buy? Send a photo of the sticker on your control unit and we will check that the numbers match.
