FAQ : How to Identify Your Honda ECU

FAQ : How to Identify Your Honda ECU


It’s a fairly easy question that doesn’t always have an easy answer, especially when you have purchased a used Honda / Acura that had a history of being modded or swapped. Make sure you check out our Honda ECU Chipping FAQ, but if you are looking to identify the ECU our How to Identify Your Honda ECU article is for you.




Honda ECU’s have a common system when it comes to naming their ECUs, and this label is located on the side of the unit.

  • The first grouping of part numbers (pink circle), 37820 in this example is Honda’s part number designation for the ECU.
  • The second grouping of part numbers (white circle), P28 in the picture above relates to the vehicle or engine.
  • The third grouping of characters (orange circle) is the revision build of the ECU in question.

What ECU do I have in my car?

To determine what year, make and model your ecu originated from use the second grouping of numbers ( white circle ) and refer to the chart below. Keep in mind however that many vehicle or engine codes ( P72, P28 ) came in many various years and models. Knowing How to Identify Your Honda ECU will let you get whatever job you are working on done.

  • PG6 : 88-89 Integra (all makes)
  • PM5 : 88-91 Civic/CRX DX
  • PM6 : 88-91 Civic/CRX SOHC Si
  • PM7 : 89-91 DOHC ZC (JDM ‘EF’ ECU)
  • PM8 : 88-91 CRX HF
  • PR2 : 89-91 ZC (Euro)
  • PR3 : 89-91 JDM B16A EF8/9
  • PR3 -J00 or J51 : 92 JDM Integra B16A EF8/9
  • PW0 : 89-91 JDM B16A EF8/9 DA6-XSi
  • PR4 : 90-91 Integra LS/GS
  • PS9 : 88-91 4 door Civic EX Auto
  • P05 : 92-95 OBD-1 Civic CX
  • P06 : 92-95 OBD-1 Civic DX
  • P07 : 92-95 OBD-1 Civic VX
  • P08 : 92-95 OBD-1 Civic D15 JDM
  • P0A : 94-95 OBD-1 Accord EX
  • P13 : 93-95 OBD-1 Prelude Vtec
  • P14 : 93-95 OBD-1 Prelude Si (non Vtec)
  • P27 : 92-95 OBD-1 EG JDM Civic 1600 sohc
  • P28 : 92-95 OBD-1 Civic Si/Ex
  • P30 : 92-95 OBD-1 DelSol DOHC Vtec Si/EG SiR
  • P54-G31 : 1997 Honda Accord 1.8 LS
  • P61 : 92-93 OBD-1 Integra GSR
  • P72 : 94-95 OBD-1 Integra GSR
  • P72 : 96-00 OBD-2 Integra GSR
  • P73 : 96-00 OBD-2 Integra Type-R (JDM & USDM)
  • P74/75: 92-95 OBD-1 Integra LS/GS
  • P75 : 96-00 OBD-2 Integra LS/GS
  • P2N : 96+ OBD-2 Civic HX Coupe
  • P2P : 96+ OBD-2 Civic EX Coupe
  • P2E : 96+ OBD-2 Civic DX Coupe
  • P2M : 96+ OBD-2 NZ Civic SOHC VTEC
  • P2T : 99+ OBD-? Civic Si Coupe
  • P5P : 97-00 OBD-2 Prelude Type-S (JDM ECU)
  • PBA : 97+ US Acura 1.6EL
  • PCT : 98+ JDM ITR / CTR
  • PCX : 99+ OBD-? S2000
Chipping the Honda ECU ROM – Identifying the ROM numbers

The revision number can also be located inside the ECU as well as on the actual ROM itself as well as other locations. Read more about Honda ECU chipping here at our How To Chip Your Honda ECU.

You can also refer to the software revision number that can be located inside the ECU cover by unscrewing the middle bolt. Taking a look at the main processor will give you a great clue on how to identify your Honda ECU.

This processor will also have a two or three digit number on the 28 pin ROM chip, which will let you know exactly what your Honda ECU is. Certain engines like the H series and the SOHC F variations found in the Accord and Prelude can use a letter and number code in their ECU.

Have any questions about our How to Identify Your Honda ECU article? Leave us a comment below and let us know!


  1. Hello, I have a stock 93 civic ex with a bad ECU. I’m limited on funds at the moment and need a new one. I’m going to scour through the local junk yard for a replacement but was wondering what other ECU are compatible if I am unable to find a P28 model. Thanks in advance!

  2. I just recently bought a stock 96 5 speed civic lx I’m curious as to what kind of engine swap/build I could possibly do here as well as the ecu type and what do bout a code 73 72 and 71 for the airbag module.? I’m looking to keep it a daily but still be able to take her to import day and turn some heads ;]

  3. Hey I have 3 ecu I’ve been trying to identify can you help me out.
    1) 37820-POH-L02 886-308284
    2) 37820-POJ-L02 872-302116
    3) 37820-PAA-L60 1002-115932
    I’ve looked online and I couldn’t find anything on them. Any help is much appreciated.