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.
SAM comfort module Mercedes Benz A2129005912
Vendors's code: A2129005912
Product code: A2129005912
Barcode:
Code 39:
ISBN:
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Part number A2129005912 - is it the right choice?
This listing is for a used, working part for Mercedes Benz: SAM comfort module, numbers A2129005912. Before buying, compare the numbers with the label on the part in your car.
SAM comfort module Mercedes Benz
The SAM comfort module controls selected body consumers. The unit offered applies to: Mercedes Benz; it is used, working and in good condition.
Listing details
- Mercedes Benz - model
What this part does
It is an electronic node of the body wiring: it receives signals from switches and sensors and then activates consumers such as lights, locks or ventilation.
In Mercedes cars the SAM (Signalerfassungs- und Ansteuermodul) collects signals from switches and controls body consumers, so its version depends on the model and equipment.
Fitment
For this model we offer several parts that differ in their numbers. The number on the label decides, not the model name alone.
Numbers to compare
- A2129005912 - Mercedes-Benz number (OEM)
What a fault looks like
- door signalling works incorrectly,
- the battery drains overnight for no obvious reason,
- the interior lighting does not switch off,
- nothing happens when settings are changed.
Compare all numbers with the label on your module, because the same car model may have had several versions.
Frequently asked questions
| Why does the number have several spellings? |
|---|
| The same label number is written with spaces, dashes or as one string. We give both forms so that it is easier to find. |
| What does "used, working" mean? |
| This is a used, working part in good condition. You will find the warranty period in the product features table. |
| What condition is this part in? |
| It is a used, working part in good condition. Warranty details are listed in the offer features. |
Send a photo of your part or its number to contact@auto24parts.com and we will confirm whether this listing fits.