Complete List Of Honda ECU by Type

January 20, 2021
Posted in Car
January 20, 2021 Bermano Reiko

ECU Generations

Honda ECUs run in generations, which use different connectors. Below is a stack of ECUs running from the newest generation at the top to the oldest generation at the bottom.
OBD0 – 88-91 Civics
OBD1 – 92-95 Civics
OBD2a – 96-98 Civics
OBD2b – 99+ Civics

ECU Part Numbers

All Honda ECUs have a part number which is located on the side of the ECU and inside the ECU on the connector. e.g. 37820-P72-A01.
The format is always the same: 37820-XXX-XXX

The part number consists of three components:
Honda’s part number for ECU, which is always 37820
Three characters (which are loosely related to the model of car/engine). e.g P72
Three characters (which are the revision of the ECU) e.g. A01 or G52

The middle 3 characters are the most useful to identify what the ECU is. Different generation ECUs may use the same characters. e.g. a P72 OBD I ECU is different from a P72 OBD II ECU. Here is a list of common ECUs:
PG7 : 86-89 Integra (86-87 vac advance, 88-89 electronic advance)
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

The last 3 characters are broken down into 3 parts:
1st Letter: country of orgin
J: Japan
C: Canada
A: USA
2nd Digit: If this digit is 5, 7, or 9, then the ECU is for automatic transmission usually
3rd Digit: denotes the version/variation

88-91 ECU:
Manual: 000, 001, 002, A00, A01, A10, J00, J001, C01, C00
Automatic: J51, J50, A50, A51, 901, A60, C50, C51, X30, A80
92-95 ECU:
Manual: 000, 001, 002, 003, A00, A01, A02, C00, C01, C02, J00, J01, J02
Automatic: J50, J51, 901, 902, C50, C51, C52, A50, A51, A52
96-00 ECU:
Manual: 000, 001, 002, 003, A00, A01, A03, C00, C01, C02, C03, J00, J01, J02, A11, C11
Automatic: A70, A71, A72, A91, A92, C70, C71, C72, C91, C92

ECU ROM Numbers

As further identification Honda ECUs have a software revision number inside the ECU. This is usually a two or three digit number stamped on the 28 pin ROM, or main processor. Accord and Prelude ECUs can use a letter and number code.

If you need scan tools for Honda OBD1 ECU’s please check my other post
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