VW / Audi / Seat / Skoda (VAG) Bosch EDC15C4 Engine ECU Repairs

Type: Bosch
Fits: VAG – Audi / Seat / Skoda / Volkswagen (VW)
Fuel: Diesel
Ref: ECUT223295

Note: This ECU may also fit other models.

The letter after the 15 in EDC15C4 says which diesel injection system the unit was built to run. C is the common-rail one. It is a diesel engine ECU, and these are units we test and rebuild.

Bosch put the EDC15 name on units built around three different fuel systems, and the suffix is what separates them. V denotes the injection-pump version, P the pump-nozzle or unit-injector version, and C the common-rail version. Two ECUs can both be labelled EDC15 and have been designed around entirely different fuelling hardware.

That is why the part numbers further down this page look nothing like the ones you would find against an EDC15P or EDC15V unit. A common-rail ECU is controlling a different set of injection hardware, so it went into different engines and carries its own numbers.

On the VAG side, the common-rail 2.8 TDI is the LT van. The LT Mk2’s 2.8 TDI was built first with pump injection, engine codes AGK and ATA, and then from 2001–02 in common-rail form, engine codes AUH and BCQ, rated at 116 kW and quoted as 158 or 160 hp depending on where you read it. The common-rail engine is the one this ECU runs; the pump-injection version of the same 2.8 uses a different unit.

The list bears that out. All four OEM numbers are 2D0 906 019, and 2D0 is the LT Mk2 prefix: 2D0 906 019 C against Bosch 0281010587, 2D0 906 019 A against 0281010588, the plain 2D0 906 019 against 0281011028, and 2D0 906 019 G against 0281012137. Four rows, one base number in four revisions, and not an Audi, a Seat or a Skoda among them.

The suffix letter is the revision, and it changes nothing about how the unit is handled here: all four sit on the same list, and all four are work we take in. A 2D0 906 019 carrying a letter that is not on the list has not been ruled out by that alone — the note near the top of this page is there for exactly that reason, and the list records what has come through the workshop rather than every number the ECU was built under.

So if the unit in front of you carries one of those numbers, it came off an LT 2.8 common rail, and it is one we repair. If you are on an Audi, Seat or Skoda diesel of the same period, read the letter on your own unit before going further — every number logged here is a Volkswagen.

The EDC15C4 platform itself was not exclusive to VAG. Other manufacturers fitted it to their own diesels under their own part numbers, and those units are dealt with on our Bosch EDC15C4 page rather than this one.

Symptoms alone will not name a failed EDC15C4, and we would rather have a unit on the bench than work backwards from an account of how a vehicle behaves. What the EDC15C4 units repaired here share is not a symptom but a sequence, and that tells you where in your own diagnosis you stand.

Those units came in under other manufacturers’ part numbers rather than VAG ones; the EDC15C4 was fitted well beyond VAG, so read what follows as platform behaviour, not as anything specific to one vehicle. Every one of them was intermittent — cutting out, refusing to start, or both, rather than a unit that had died outright. On one, the injectors, the diesel pump and the wiring had all been checked and were fine, and it was still an intermittent non-starter. On another, the customer’s own testing had confirmed the engine was not firing on all cylinders, and it ran rough and was hard to start. On a third, the rev counter had stopped working alongside the non-start. All three were tested here, confirmed faulty and repaired.

The first two of those read as a fuelling fault before they read as an ECU one, which is why fuelling gets chased first and the ECU last. Testing the unit on its own is what separates them, and that is what we would rather do than guess.

A unit that arrives here is logged, looked over and put on electrical test, and you hear what the testing found and what putting it right would involve before anything is agreed. No chargeable work is carried out until you have authorised it. The repair is then made on your own board at component level — the failure traced on the board and the part replaced by hand under a microscope, by our own engineers, in our own UK workshop, with nothing sent out. Final testing comes last, and a unit that does not pass it does not go back. Repairs are covered by our 24-month warranty.

The other Volkswagen units we hold numbers for are grouped in our Volkswagen directory. The unit travels to us and back by post, from anywhere in the UK.

A number off the list is enough to start, and so is an LT 2.8 common rail whose ECU has stopped doing its job. Book it in on the Repair Form with the numbers off your unit, or speak to the workshop on 0208 853 5000.

Common part numbers associated with this type of unit