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 Volvo V40 2.0 Siemens P30614639 S108212004E
Vendors's code: P30614639
Product code: S108212004E
Barcode:
Code 39:
ISBN:
€81.30
Price
€81.30
€100.00
Price
€100.00
Ask about the product
Engine control unit Volvo V40 2.0 Siemens P30614639 S108212004E
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€30.00
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from
€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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Will the P30614639 ECU fit your Volvo V40 2.0?
We offer a used, fully working Siemens engine control unit with part numbers P30614639 and S108212004E. It fits if the same numbers appear on the label of the ECU in your car. Available locked or unlocked.
Engine control unit Volvo V40 2.0 Siemens P30614639 S108212004E
The P30614639 engine ECU is a Siemens unit fitted to the Volvo V40 2.0. Using signals from the sensors, it manages the engine, including fuel quantity and injection timing.
Numbers on the label
- P30614639 – Volvo part number
- S108212004E – Siemens number
Compare them with the sticker on the ECU in your car. The number decides the fit, not the model alone – Volvo used different ECU versions.
Typical fault symptoms
- the engine will not start despite a good power and fuel supply,
- no communication with the ECU during diagnostics,
- limp mode with no sensor fault,
- damage after water ingress or a voltage spike.
Rule out the battery, fuses and connectors first – they are often the real cause.
Locked or unlocked?
There are two variants: locked, with the previous vehicle’s data and immobiliser, for garages, and unlocked, which we prepare before dispatch.
We agree the preparation method case by case – it depends on the software version and the immobiliser. Ask us about it before ordering the P30614639 ECU.
All variants are described on our Locked & Unlocked ECUs page.
Frequently asked questions
| Can I fit an ECU with a different number suffix? |
|---|
| A different suffix can mean a different software or hardware version. Send us a photo of the label and we will check whether the P30614639 ECU is suitable. |
| Will the ECU start the engine straight after fitting? |
| The locked version will not – it needs programming and matching to the immobiliser. With the unlocked version it depends on the preparation method, which we agree before purchase. |
| What condition is the ECU in? |
| It is a used part, fully working and in good condition. The warranty period is shown in the product features table. |
Not sure which variant to choose? Email contact@auto24parts.com with the numbers from your label – we will check the available options.
