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 Toyota 8966174041 2120004831
Vendors's code: 2120004831
Product code: 8966174041
Barcode:
Code 39:
ISBN:
€121.95
Price
€121.95
€150.00
Price
€150.00
Ask about the product
Engine control unit Toyota 8966174041 2120004831
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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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Where to find number 8966174041 on Toyota engine control units?
Used Toyota engine control unit with number 8966174041. Send us the numbers from the label on your control unit.
What does number 8966174041 mean on Toyota engine control units?
If the engine will not start or the engine warning light is on, one possible cause is the control unit. Control unit 8966174041 for Toyota is a used original part, inspected before sale. 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
Below are the numbers as they appear in the listing, together with the single-string form used in catalogues:
- 8966174041, car manufacturer's original number,
- 2120004831, control unit manufacturer's number.
The ending of a number often indicates a different version of the control unit, so compare every character. If you are in doubt, write to us before buying.
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.
What can point to an engine control unit failure
- the diagnostic tester cannot connect to the control unit,
- the engine starts and immediately stalls,
- starting is blocked by the immobiliser after the electronics have been replaced or repaired,
- the housing or connector of the control unit shows signs of water ingress or corrosion.
Similar symptoms also occur with faulty sensors, bad fuel or worn spark or glow plugs, so start with diagnostics and only then replace the electronics.
Questions and answers
| Will the control unit work after fitting without programming? |
|---|
| That 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. |
| Does a lit engine warning light always mean a faulty control unit? |
| No. Read the fault codes first, because the cause may be a sensor, the wiring or the power supply. |
| Is this an original control unit? |
| Yes, it is a used original engine control unit, not an aftermarket replacement. You can compare the numbers on the label with the original in your car. |
| Is this a new part? |
| No. We sell used original control units, each one 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.
