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 Volkswagen, Audi Hitachi 4A0906266AA
Vendors's code: 4A0906266AA
Product code: 4A0906266AA
Barcode:
Code 39:
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€142.28
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€175.00
Price
€175.00
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Engine Control Unit Volkswagen, Audi Hitachi 4A0906266AA
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What does the number 4A0906266AA on the Hitachi ECU mean?
4A0906266AA is the Volkswagen Group part number for this Hitachi engine control unit. It comes from a Volkswagen or Audi with a petrol engine and is used and in working order.
Engine Control Unit Volkswagen, Audi Hitachi 4A0906266AA
Hitachi is a less common ECU manufacturer in Volkswagen Group vehicles, which makes the part number particularly important here. This unit, marked 4A0906266AA, manages a petrol engine in a Volkswagen or Audi. The data does not give the model, engine size or family, so a replacement must be matched by part number alone. When the ECU stops working, the engine usually won't start or runs very roughly, and diagnostics may not see the unit at all.
The number and what it means
- 4A0906266AA – Volkswagen / Audi part number (4A0 906 266 AA)
- Hitachi – ECU manufacturer
The “906” group in the number denotes an engine control unit, and the AA suffix a specific version. A different suffix may mean different hardware or software, so compare the full number with the unit in your vehicle.
When the ECU may be to blame
- the engine won't fire even though the starter turns it over,
- hunting idle speed,
- stalling once the engine has warmed up,
- the ECU cannot be read during diagnostics.
In older vehicles, start with the main relay, earths and plug condition – these are the most common causes of similar symptoms. It is also worth reading the fault memory if the diagnostic tool can connect.
Locked or unlocked
An unlocked ECU is prepared before dispatch – usually within 1–2 working days. A locked one holds the data and immobiliser of the vehicle it came from; it is intended for workshops that unlock, program and match it themselves.
Whether PIN / CAR PASS, Virgin, IMMO OFF, auto programming or cloning will be possible depends on the part number, software and immobiliser. Please ask before buying. Description of the options: ECU preparation options.
Questions and answers
| Which Audi model does this ECU fit? |
|---|
| The data does not specify a model – go by the number 4A0906266AA on your unit. |
| Will the locked version work without programming? |
| No, it has to be programmed and matched to the immobiliser. |
| What condition is the ECU in? |
| Used, in working order and in good condition. You will find the warranty period in the product features table. |
Send a photo of the label to contact@auto24parts.com and we'll confirm compatibility.
