SEAT ECU – Ibiza, Leon, TDI & TSI Engine Control Units

SEAT engine control units – ECU identification by VAG and manufacturer part number

A SEAT engine control unit (ECU), also known as an ECM or engine computer, manages engine operation and exchanges information with other vehicle systems. Depending on the engine and ECU generation, the module may control fuel injection, ignition, fuel pressure, turbocharger operation, electronic throttle control and selected emissions-related systems.

For replacement purposes, however, the most important task is identifying the exact ECU fitted to the vehicle. SEAT uses electronic systems shared across Volkswagen Group platforms, but similar housings, connectors or ECU-family names do not automatically mean that modules are interchangeable.

The complete SEAT / VAG OEM number, electronics manufacturer reference, ECU family and relevant vehicle information should therefore be compared before ordering.

SEAT VAG ECU numbers – 03G, 03L, 038, 045, 03C and 03F

The current SEAT range contains several characteristic Volkswagen Group part-number families. Examples include:

• 03L906018FJ,
• 03L906018NE,
• 03L906018KT,
• 03G906021LP,
• 03G906016JN,
• 03G906016DG,
• 03G906016HM,
• 038906013AJ,
• 045906013T,
• 03C906027AD,
• 03F906070CG.

The common prefix helps identify the general VAG number family, but the complete reference, including the final letters, is important. 03L906018FJ, 03L906018NE and 03L906018KT should not be treated as the same ECU merely because they share the 03L906018 sequence.

Why does a SEAT ECU have both a VAG number and a Bosch or Siemens number?

Many SEAT engine control units carry a Volkswagen Group OEM number together with a separate reference assigned by the electronics manufacturer.

Examples from the current catalogue include:

• 03L906018FJ / Bosch 0281017154 / EDC17C46,
• 03L906018NE / Bosch 0281017954,
• 03G906021LP / Bosch 0281013283 / EDC16U34,
• 03G906016HM / Bosch 0281012278 / EDC16U1,
• 045906013T / Bosch 0281015033,
• 03C906027AD / Bosch 0261S04707 / MED17.5.5,
• 03F906070CG / 5WP44748,
• 03E906033P / Siemens 5WP40196 / Simos 3PE.

Using both references usually gives a much more precise search result than searching only for “SEAT ECU” or by vehicle model.

SEAT EDC17C46 – 0281017154 / 03L906018FJ

One of the current diesel modules is the SEAT Bosch ECU 0281017154 / 03L906018FJ / EDC17C46.

The product combines Bosch reference 0281017154, VAG number 03L906018FJ and the EDC17C46 engine-management family.

The current product is available in Locked / Ready for programming variants. The available preparation should be selected according to the specific vehicle and intended programming procedure.

SEAT 03L906018NE / Bosch 0281017954

Another module from the 03L number family is the SEAT ECU 03L906018NE / Bosch 0281017954.

Although this reference begins similarly to 03L906018FJ, the final letters and Bosch number are different. The complete VAG reference should therefore always be retained.

SEAT EDC17C46 – 0281017942 / 03L906018KT

The catalogue also contains the SEAT ECU Bosch 0281017942 / 03L906018KT / EDC17C46.

This is especially useful for demonstrating why the ECU-family name alone is not enough. Both this unit and 0281017154 / 03L906018FJ belong to the EDC17C46 family, yet they carry different Bosch and VAG references.

SEAT 2.0 TDI – 0281013283 / 03G906021LP / EDC16U34

A current EDC16 diesel example is the SEAT 2.0 TDI ECU Bosch 0281013283 / 03G906021LP / EDC16U34.

The EDC16U34 designation identifies the general control-unit family, while 0281013283 and 03G906021LP identify the specific module more precisely.

SEAT Altea 2.0 TDI BKD – 0281012278 / 03G906016HM

For SEAT Altea 2.0 TDI with the BKD engine designation, the current catalogue includes the SEAT Altea ECU Bosch 0281012278 / 03G906016HM / EDC16U1.

The engine code BKD is useful additional information, but the final selection should still be based primarily on the complete ECU references.

SEAT Altea 1.9 TDI – 03G906016DG / Bosch 0281011885

Another Altea diesel module is the SEAT Altea 1.9 TDI ECU 03G906016DG / Bosch 0281011885.

This differs from the 2.0 TDI BKD control unit above despite both being used in Altea applications. Vehicle model alone is therefore not enough to identify the correct ECU.

SEAT Alhambra / VW Sharan – 03G906016JP / 0281012696

Some SEAT control units appear in applications shared with other Volkswagen Group brands. One example is the SEAT Alhambra / Volkswagen Sharan 2.0 TDI ECU 03G906016JP / Bosch 0281012696 / EDC16U31.

The shared application should not be interpreted as universal compatibility across all SEAT and Volkswagen vehicles. The exact OEM reference, Bosch number, ECU family and vehicle configuration must still be checked.

SEAT 1.9 SDI – Bosch 0281001912 / 038906013AJ

The category also contains earlier diesel engine-management systems. One example is the SEAT 1.9 SDI ECU Bosch 0281001912 / 038906013AJ.

This unit uses an older 038... VAG reference and Bosch 028100... numbering, clearly distinguishing it from later EDC16 and EDC17 generations.

SEAT Ibiza 1.4 TDI – 0281015033 / 045906013T / 045906013E

For SEAT Ibiza 1.4 TDI, Auto24Parts currently lists the SEAT Ibiza ECU Bosch 0281015033 / 045906013T / 045906013E.

This module contains two VAG references together with Bosch number 0281015033. All references visible on the original module should be retained when comparing replacement units.

SEAT Ibiza Cupra 1.4 TSI – 03C906027AD / 0261S04707 / MED17.5.5

Petrol TSI engine management is represented by the SEAT Ibiza Cupra 1.4 TSI Bosch ECU 03C906027AD / 0261S04707 / MED17.5.5.

This module combines the VAG number 03C906027AD, Bosch reference 0261S04707 and the MED17.5.5 family designation.

The current product offers locked and ready-for-programming variants. MED17.5.5 alone should not be used to confirm compatibility because other VAG vehicles also use different ECUs from the same family.

SEAT Leon 1.2 TSI – 03F906070CG / 5WP44748

Another petrol example is the SEAT Leon 1.2 TSI ECU 03F906070CG / 5WP44748.

This module uses VAG number 03F906070CG together with electronics reference 5WP44748. It demonstrates that not every SEAT petrol ECU follows Bosch 0261S... numbering.

SEAT Leon 1.8 TSI – 1P0907115P / 1P0907115A / 0261S04319

For another Leon petrol application, the catalogue contains the SEAT Leon 1.8 TSI ECU 1P0907115P / 1P0907115A / Bosch 0261S04319 / MED17.5.

The module carries two VAG references and a Bosch number. MED17.5 and MED17.5.5 should also be treated as separate system designations rather than interchangeable versions.

SEAT Arosa 1.0 – 030906032DJ / Bosch 0261208097 / ME7.5.10

The current catalogue also covers older naturally aspirated petrol applications. One example is the SEAT Arosa 1.0 ECU 030906032DJ / Bosch 0261208097 / ME7.5.10.

This module uses a different generation of Bosch petrol engine management from later MED17 systems. The product is currently offered in locked and ready-for-programming variants.

SEAT Ibiza / Cordoba 1.2 – Siemens 5WP40196 / 03E906033P / Simos 3PE

SEAT petrol engine electronics also include Siemens systems. The SEAT Ibiza / Cordoba 1.2 ECU 03E906033P / Siemens 5WP40196 / Simos 3PE is one example.

The Siemens 5WP reference and Simos family should be checked together with the complete VAG number. This is another reason not to assume that all SEAT ECUs can be identified using Bosch numbers.

EDC15, EDC16 and EDC17 SEAT diesel ECUs

SEAT diesel engine control units in the current catalogue cover several generations of electronic diesel control.

Examples include older EDC15 modules, a large group of EDC16U1, EDC16U31 and EDC16U34 control units and later EDC17C46 and EDC17U01 systems.

Representative current references include:

• 038906012AT / 0281010062 – EDC15UM+,
• 038906019KT / 0281011219 – EDC15P+,
• 03G906016HM / 0281012278 – EDC16U1,
• 03G906016JP / 0281012696 – EDC16U31,
• 03G906021LP / 0281013283 – EDC16U34,
• 03L906018FJ / 0281017154 – EDC17C46,
• 03G906013K / 0281014883 – EDC17U01.

The general phrase “SEAT TDI ECU” therefore covers many separate engine-management generations. Exact numbers should always be used to narrow the search.

MED17, ME7, Simos and other SEAT petrol ECU families

SEAT petrol applications are similarly diverse. The current catalogue contains older Bosch ME systems, Siemens Simos modules and later Bosch MED17 controllers.

Examples include:

• 030906032DJ / 0261208097 / ME7.5.10 – Arosa 1.0,
• 03E906033P / 5WP40196 / Simos 3PE – Ibiza / Cordoba 1.2,
• 03C906027AD / 0261S04707 / MED17.5.5 – Ibiza Cupra 1.4 TSI,
• 1P0907115P / 0261S04319 / MED17.5 – Leon 1.8 TSI.

The ECU-family name helps narrow the search but does not replace the complete VAG and manufacturer references.

SEAT Ibiza ECU – many engines and many control-unit families

Ibiza is one of the strongest application groups in the current SEAT category. Different generations use petrol and diesel ECUs from Bosch, Siemens and other manufacturers.

Examples include:

• 0281015033 / 045906013T / 045906013E – Ibiza 1.4 TDI,
• 0281010957 / 038906019HQ – Ibiza 1.9 TDI,
• 0281014883 / 03G906013K – Ibiza 1.9 TDI EDC17U01,
• 03E906033P / 5WP40196 – Ibiza / Cordoba 1.2,
• 0261S04707 / 03C906027AD – Ibiza Cupra 1.4 TSI.

This makes “SEAT Ibiza ECU” a useful category-level phrase, but the final replacement module should be chosen from the exact numbers on the original ECU.

SEAT Leon ECU – TDI and TSI control-unit generations

Leon applications also cover a wide range of engine-management systems. Current products include older EDC15 diesel ECUs, numerous EDC16 modules and later petrol TSI controllers.

Examples include:

• 038906012AT / 0281010062 – Leon 1.9 TDI,
• 03G906021JS / 0281013624 / EDC16U34 – Leon 1.9 TDI,
• 03G906021JE / 0281013621 – Leon 2.0 TDI,
• 03F906070CG / 5WP44748 – Leon 1.2 TSI,
• 1P0907115P / 0261S04319 – Leon 1.8 TSI MED17.5.

Engine capacity and vehicle model therefore provide useful context, but exact ECU identification still depends on the label references.

SEAT, Volkswagen, Audi and Škoda shared VAG electronics

SEAT is part of the Volkswagen Group and shares engines, platforms and electronic systems with Volkswagen, Audi and Škoda. As a result, some ECU numbers can appear in applications involving more than one VAG brand.

Examples in the current SEAT catalogue include shared SEAT Alhambra / Volkswagen Sharan applications as well as earlier SEAT / Volkswagen and SEAT / Škoda electronic systems.

This does not mean that all ECUs from related VAG vehicles are automatically interchangeable. Exact OEM numbers, manufacturer references, hardware, software, engine code and vehicle configuration must still be verified.

Related categories include Volkswagen engine control units, Audi engine control units and Škoda engine control units.

Bosch, Siemens, Continental and Magneti Marelli SEAT ECUs

The SEAT category currently includes engine-control modules classified under Bosch, Continental, Siemens and Magneti Marelli.

Bosch is especially prominent across the TDI and TSI ranges, while Siemens references such as 5WP... appear on selected petrol systems. Other VAG generations use Continental or Magneti Marelli electronics.

Manufacturer pages that may also help with identification include Bosch automotive electronics, Siemens automotive modules and Magneti Marelli electronic modules.

Used / locked SEAT ECU

A standard used / locked SEAT engine control unit normally retains data from the vehicle in which it was previously installed. Depending on the ECU generation and vehicle security system, further electronic preparation may be required before the module can operate in another vehicle.

This type of ECU is mainly intended for workshops and automotive electronics specialists equipped to prepare and programme replacement control units.

SEAT ECU ready for programming

Many current SEAT products are available in locked and ready-for-programming variants. Examples include selected EDC17C46, MED17.5.5 and older Bosch modules.

The exact available preparation depends on the control-unit type and vehicle. Programming, coding or immobiliser-related adaptation may still be required after installation.

See the ECU preparation options page for more information.

VIRGIN SEAT ECU

For selected SEAT control units, an ECU may be reset or otherwise prepared for subsequent adaptation to another vehicle. This type of preparation can be described as VIRGIN.

The exact meaning and installation procedure depend on the ECU family and vehicle generation. A VIRGIN ECU should not automatically be considered Plug & Play unless the specific product description states this.

SEAT immobiliser and ECU replacement

In many SEAT vehicles, engine-start authorisation involves security data shared between the engine ECU and other vehicle electronics. A standard used ECU can retain immobiliser-related information from its previous vehicle.

Depending on the model, ECU family and preparation method, adaptation, programming, synchronisation or transfer of vehicle-specific data may therefore be required.

SEAT ECU cloning

For selected compatible control units, SEAT ECU cloning may be another preparation method. If the required information can be correctly read from the original ECU, relevant data can be transferred to a compatible replacement module.

Depending on the ECU design, this may include EEPROM or FLASH content, software, configuration and immobiliser-related information.

The possibility of cloning depends on the control-unit type and the condition of the original ECU. If the required data cannot be recovered correctly, another preparation method may be necessary.

Why matching only EDC16, EDC17 or MED17 is not enough

An ECU-family designation identifies the general engine-management architecture but not the exact control unit.

For example, the current SEAT catalogue contains several different EDC16U34 modules and more than one EDC17C46 reference. Likewise, MED17.5 and MED17.5.5 are families containing different VAG and Bosch part numbers.

The preferred identification sequence is therefore:

• complete SEAT / VAG OEM part number,
• Bosch, Siemens, Continental, Magneti Marelli or other manufacturer number,
• ECU-family designation,
• vehicle model and generation,
• engine capacity and engine code where known,
• hardware and software identification where required.

Common symptoms that may indicate a SEAT ECU problem

A defective engine control unit can produce different symptoms, but similar problems may also be caused by sensors, wiring, actuators, fuel-system components, power-supply faults or vehicle-network problems.

• engine does not start,
• no diagnostic communication with the ECU,
• engine stalls or is difficult to restart,
• limp mode or reduced engine power,
• injector or ignition-control faults,
• incorrect throttle response,
• fuel-pressure or turbocharger-control faults,
• CAN communication errors,
• fault codes that repeatedly return,
• internal ECU memory or electronic faults.

Before replacing the ECU, check battery voltage, ECU power supply, ground connections, fuses, relays, connectors and wiring. A diagnostic trouble code alone does not prove that the engine control unit itself is defective.

SEAT engine control units by exact part number

Searching by the complete VAG and electronics manufacturer references is one of the most effective ways to locate the correct SEAT ECU:

• 0281017154 / 03L906018FJ / EDC17C46 – SEAT ECU
• 0281017954 / 03L906018NE – SEAT Bosch ECU
• 0281017942 / 03L906018KT / EDC17C46 – SEAT ECU
• 0281013283 / 03G906021LP / EDC16U34 – SEAT 2.0 TDI ECU
• 0281012696 / 03G906016JP / EDC16U31 – SEAT Alhambra / VW Sharan ECU
• 0281012278 / 03G906016HM / EDC16U1 – SEAT Altea 2.0 TDI BKD ECU
• 0281015033 / 045906013T / 045906013E – SEAT Ibiza 1.4 TDI ECU
• 0261S04707 / 03C906027AD / MED17.5.5 – SEAT Ibiza Cupra 1.4 TSI ECU
• 03F906070CG / 5WP44748 – SEAT Leon 1.2 TSI ECU
• 1P0907115P / 1P0907115A / 0261S04319 – SEAT Leon 1.8 TSI ECU
• 030906032DJ / 0261208097 / ME7.5.10 – SEAT Arosa 1.0 ECU
• 03E906033P / 5WP40196 / Simos 3PE – SEAT Ibiza / Cordoba ECU

How to check SEAT ECU compatibility before ordering

Take a clear photo of the complete original ECU label. The SEAT / VAG OEM number, Bosch, Siemens, Continental, Magneti Marelli or other electronics manufacturer reference and any EDC, MED, ME or Simos family designation should all be readable.

If you need help identifying the correct replacement module, contact Auto24Parts and send the photo together with the SEAT model, model year, engine capacity, power output and engine version.

For other vehicle makes, browse the complete engine control unit catalogue. Related VAG engine modules can also be found in the Volkswagen ECU, Audi ECU and Škoda ECU categories.

Other SEAT electronic components can be found in the SEAT ABS pump category.

Before ordering, you can also review our How to Buy guide, Shipping & Delivery information and Returns, Warranty & Complaints conditions.

FAQ – SEAT ECU and Engine Control Units