Original Volvo Reference for EMS2 Injection ECU on 2006 FM9 D9A380 VT2412B Side Connector

electroniconc wrote:

@ElektrodaBot what is the original volvo reference for an injection ECU (direct injection) EMS2 mounted on a VOLVO truck FM9 year 2006 manual transmission VT2412B to drive a D9A380 engine, connectors...

Initial assessment of available information
You specified a Volvo FM9 (model year 2006), engine D9A380, manual gearbox VT2412B, with the early TRW EMS2 engine ECU whose multi‑pin connectors are on the side (not the later top‑entry style). That description matches the first‑generation EMS2 hardware used on Euro 3/early Euro 4 D9A engines. Listings and cross‑reference catalogs for FM/FL/FE trucks with D9A380 consistently point to a small family of Volvo “20xxxxxx” ECU part numbers for this side‑connector EMS2 unit. (autoline24.it)

Direct answer to the question
Most likely original Volvo references for the EMS2 (side‑connector, “old gen”) on a 2006 FM9 D9A380 are:
- 20577131 (common OE number for D9A EMS2 on FM/FM9; often printed with a suffix like P01/P02). (autoline.hr)
- 20582958 (documented as compatible with FM/FL/FE trucks using D9A, including D9A380; appears as a later/superseding or interchangeable reference to 20577131 in several parts listings). (autoline24.it)

Earlier/sibling references you will also see for the same EMS2 hardware family on D9A trucks:
- 20451743 / 20451745 / 20451746 (older FM/FL/FE D9A EMS2 part numbers that cross‑reference with the above). (autoline24.it)

Volvo reman/exchange references frequently encountered for this EMS2 family include 85000086, 85000388, 85000846. (autoline24.it)

Because Volvo parts are chassis‑specific, the exact OE number that left the factory with your truck is best confirmed from the VIN (IMPACT/Tech Tool) or the label on the existing ECU.

Detailed problem analysis
- Hardware family and orientation:
- Your “connectors on the side” description corresponds to the early TRW EMS2 hardware used on D9A. These units were widely fitted across FM/FL/FE with D9A and share hardware across trucks and some Volvo CE machines; the critical differences are in software/dataset, not the casting. Cross‑application listings (FM9 trucks and CE models) frequently show 20577131/20582958 as the same physical ECU platform. (fridayparts.com)
- Why 20577131/20582958 are the safe bets:
- Multiple independent commercial catalogs and used‑parts marketplaces list 20577131 and 20582958 specifically against FM/FM9 with D9A (including D9A380), often alongside the earlier 2045174x numbers. This is the most consistent pattern for FM9 D9A380 old‑gen EMS2. (autoline24.it)
- Suffixes and software:
- You may see suffixes such as “P02” (e.g., 20577131‑P02) on labels; this indicates a hardware/software index. The hardware can be common across D9A power ratings, but the dataset must match D9A380 and your transmission configuration. Example: listing for “20577131‑P02” on FM9. (autoline.hr)
- What about other numbers you might encounter online?
- 20977019 (TRW EMS2) appears in many tuning/file databases but is typically associated with later D11/D13 EMS2 applications (FH/FM/FM X), not the early side‑connector D9A EMS2. It is not the usual OE reference for a 2006 FM9 D9A380. (auto-remap.com)
- 20814604 and 20561252 also appear in EMS2 contexts, but again predominantly tied to D13/FH12/FH13 families (later EMS2.x), not the D9A380 old‑gen hardware. (cartelematics.fr)
- 20582963 often shows up but largely in Volvo Penta/industrial generator contexts (TWD/TAD engines), not FM9 truck D9A applications. Avoid confusing that with the truck ECU. (ebay.com)
- Manufacturer note:
- The D9A EMS2 ECU on FM9 is a TRW unit. Some posts attribute D9A ECUs to Bosch EDC7/EDC MS6, but those designations are not correct for the truck EMS2 you described. The FM/FL/FE EMS2 platform of this era is TRW. (General EMS2 wiring/connectors resources and service/repair sites corroborate the TRW EMS2 designation used by Volvo/Renault Trucks.) (eculogi.com)

Current information and trends
- Availability today often leans on exchange/reman or cross‑application units that must be reprogrammed to your VIN and dataset. Many reputable rebuilders/ECU services advertise full repair/reprogramming for TRW EMS2. (ecmrepairusa.com)

Supporting explanations and details
- Why manual gearbox matters: the EMS2 hardware reference is the same, but the loaded dataset must match manual VT2412B to avoid J1939 complaints about a missing I‑Shift TCM and to ensure correct engine/engine‑brake behavior. This is handled in parameterization during programming.
- Why multiple references exist: Volvo uses different OE numbers for:
- Base hardware (e.g., 20577131, 20582958, 2045174x),
- Reman/exchange programs (8xxxxxx),
- Supersessions over time.
Cross‑reference listings for FM/FL/FE D9A380 routinely bundle these together. (autoline24.it)

Practical guidelines
- Best ways to nail the exact “original” number:
- Read the ECU’s label (you’ll often see “20577131‑P0x” or “20582958”).
- Provide the 17‑digit VIN to a Volvo dealer or use Premium Tech Tool (PTT) to read the EMS2 HW/SW part numbers and dataset; Volvo’s eMedia/Tech Tool ecosystem is the official route for exact identification and programming. (volvotrucks.us)
- If replacing:
- Match hardware family (side‑connector EMS2).
- Program with the correct D9A380 dataset and vehicle parameters (immobilizer/VECU pairing as applicable).
- Avoid CE/industrial ECUs unless you will reflash to the correct truck dataset.

Corrections to conflicting information
- Claims that 20814604 is the primary D9A380 FM9 EMS2 hardware are not supported by current catalogs; that part is commonly tied to later EMS2.x on D13/FH families. (cartelematics.fr)
- Bosch EDC numbers (e.g., 0281 020 xxx) are not applicable to this TRW EMS2 truck ECU.

Ethical and legal aspects
- Ensure the ECU retains compliant emissions calibration for your market/year. Using non‑approved files (e.g., “DPF/EGR off” tunes) can violate regulations.

Suggestions for further research
- With your VIN or a clear ECU label photo, I can confirm the exact OE number and its current supersession in the Volvo system, and advise on programming steps.

Brief summary
- Most probable OE reference(s) for your 2006 FM9 D9A380, manual, side‑connector EMS2:
- 20577131 (very common on FM9/D9A EMS2), and
- 20582958 (interchange/supersession seen with FM/FL/FE D9A380),
with earlier 20451743/20451745/20451746 and reman 85000086/85000388/85000846 also appearing in the same application family. Please confirm by VIN or ECU label to be 100% sure. (autoline24.it)

Questions for you
- Can you share the last 6 of your VIN (or a photo of the EMS2 label)?
- Do you know the emission level printed on the engine plate (Euro 3 vs early Euro 4)?
With that, I can give you the exact original Volvo reference from your build record and advise on a safe replacement path.