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 Passat 1.8 Bosch 4B0906018C 0261206049
Vendors's code: 0261206049
Product code: 4B0906018C
Barcode:
Code 39:
ISBN:
€121.95
Price
€121.95
€150.00
Price
€150.00
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Engine Control Unit Volkswagen Passat 1.8 Bosch 4B0906018C 0261206049
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Where on the casing should I look for the number 4B0906018C?
The number 4B0906018C and the Bosch number 0 261 206 049 are printed on the ECU sticker. We offer this Bosch module used and working – it fits a petrol Volkswagen Passat 1.8 with an identical number.
Engine Control Unit Volkswagen Passat 1.8 Bosch 4B0906018C 0261206049
Quick starting and smooth running of a petrol Passat 1.8 depend on a properly working control module. In this unit it is a Bosch ECU with a sticker printed with VW/Audi number 4B0906018C and Bosch number 0 261 206 049. Before ordering, compare both numbers with what you see on your own module.
How to identify this module
- 4B0906018C – part number assigned by the VW/Audi group
- 0261206049 – Bosch number; the 0 261 series are petrol ECUs
The last character of the VW number matters: C indicates a specific version, and a module with a different ending is not necessarily compatible.
Typical signs of failure
- the car stalls right after starting or does not start at all,
- no control of the injectors and ignition coil,
- the engine warning light is on and the fault memory points to the module,
- damage after a voltage surge or water ingress into the electronics.
Faults in the wiring loom, earths or fuses produce similar symptoms – rule them out before you buy an ECU.
How we will prepare the module
You have two options. If you want the module ready for the next steps, order the unlocked version – we will take care of it before dispatch, usually within 1–2 working days. Workshops that program ECUs in-house usually choose the locked version with the data and immobiliser of the donor car, which they unlock, program and adapt themselves.
Whether PIN / CAR PASS, Virgin, IMMO OFF, auto programming or a clone can be used depends on the number, software and immobiliser. Please ask us before buying. Description of the options: ECU preparation options.
Questions and answers
| Will the ECU start the engine straight after fitting? |
|---|
| The locked version will not – it needs unlocking and adaptation. With the unlocked version it depends on the preparation method agreed. |
| Which numbers should I send to confirm compatibility? |
| The VW number and the Bosch number from the label, or a photo of it. |
| What condition is the module in? |
| It is a used part, working and in good condition. You will find the warranty period in the product features table. |
Questions about this 4B0906018C ECU? Write to contact@auto24parts.com.
