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 Mazda CX-7 R2AX18881K 275800-9499 2758009499
Vendors's code:
Product code: 0002-81893
Barcode:
Code 39:
ISBN:
€406.50
Price
€406.50
€500.00
Price
€500.00
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Engine control unit Mazda CX-7 R2AX18881K 275800-9499 2758009499
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€30.00
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€30.00
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(Poland)
Price 30 euros applies shipments to 5 kg on worldwide. Above this weight, please contact us by email to check price
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Does the R2AX18881K control unit fit the Mazda CX-7?
Used engine control unit, numbers R2AX18881K and 275800-9499, inspected before sale. Compare the numbers with the label on the original in your car.
Does the R2AX18881K engine control unit fit the Mazda CX-7?
We offer a used original engine control unit for the Mazda CX-7, number R2AX18881K. The white label on the lower part of the housing shows the Mazda logo, the marking R2AX, the number R2AX 18 881K, a second number 275800-9499, the code K4238 and a voltage of 12V. The housing is black, with a wide connector on one side.
Where to find the numbers on the housing
All the markings are on a single label, next to a warning about the risk of electric shock. Note down:
- Mazda part number R2AX18881K (R2AX 18 881K on the label),
- number 275800-9499, which we also give in the listing without the hyphen, as 2758009499,
- code K4238.
The hyphenated and unhyphenated forms of the number refer to the same control unit, so check both when comparing with the original.
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.
Typical symptoms of a faulty control unit
The usual reasons for replacing a control unit are that the engine will not start despite a good battery, the engine warning light stays on, or there is no communication with the tester. First check the power supply, earth connections and connector, because damage to them causes similar symptoms.
Questions and answers
| Does the control unit fit every Mazda CX-7? |
|---|
| Not always. The listing does not state the year or the engine, so compatibility is determined by the numbers on the label, not by the model name alone. |
| Why is number 275800-9499 given twice? |
| It is the same number written with and without the hyphen. Some catalogues and shops use one of these forms, so we give both. |
| Does the control unit need coding after replacement? |
| It depends on the variant of the control unit and on the car. Before buying, send us the numbers from the label and we will confirm what is needed. |
| What condition is this control unit in? |
| This is a used, original part, inspected before sale. The warranty period is given in the product features table. |
If you have any doubts after comparing the numbers, send us a photo of the label on your control unit and we will check compatibility.
