Honda ECU Master List

Honda ECU Master List

By
John Huh
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Whether you are planning a Honda engine swap or planning a turbo VTEC build, you need to pick the right Honda ECU. If you have swapped a VTEC engine there are many reasons why you could use our Honda ECU list. With so many different Honda ECU part numbers and interchangeability, the proper planning can really help you save time and money.

If you own a Honda Civic and want to modify it, you’ll need the right ECU. Picking the right Honda engine to swap into your car is just one part of the equation. This Honda ECU guide can help you wire in a piggyback computer or similar engine management device like the Super AFC.

Honda ECU

Today I’ll be showing you a complete listing of Honda ECU part numbers to pick from, the generation of vehicle they came in and where you can find them.

Honda ECU Master List

This comprehensive list of Honda engine computers is easy to use. We’ll kick off the listing with the OBD0 units below, and work through the different generations until ending at the OBD2 Hondas.

P0A – This OBD0 Honda ECU is found in the 1990-1995 Honda Accord. This generation of Accord utilized the SOHC 2.2 liter F22A Honda engine. It’s not a common Honda engine swap, but the chassis is still fairly popular today.

PG6 – Earlier OBD0 models of the Integra, this Honda ECU is found in the 1988-1989 Acuras.

PM5 – One of the most popular Honda vehicles on this list, the 1988-1991 Honda Civic was also known as the CRX. This vehicle like most in the first group of Hondas is another OBD0 vehicle.

PM6 – First groups of the CRX Si that is still a common Honda engine swap platform used this OBD0 Honda ECU. This unit is found in the 1988-1991 Honda CRX SOHC Si as well as the Civic.

PM7 – Our first JDM Honda on this list the PM7 Honda ECU is found in the 1988-1991 Honda EF, but only in the JDM models with the ZC Engine. This ECU is a OBD0 model and will require conversion if you are stepping up to a OBD1 or OBD2 engine.

PM8 – The 1988-1991 OBD0 Honda CRX HF is where you can find the PM8 ECU. Using the SOHC 1.5 liter engine, this vehicle is greatly desired for the light curb weight.

PR2 – The first EDM Honda on our list, the 1988-1991 Honda ZC engine is the one that uses this PR2 ECU.

PR3 – Earliest models of the Integra used this ECU, specifically the 1989-1991 Acura XSi/RSi trims. Of course this is another OBD0 Honda ECU and will require replacement for your Honda swap.

PR4 – You’ll be ditching this ECU when planning a LS VTEC conversion in your 1990-1993 Acura Integra LS or GS.

PR3-J00 – One of the earliest Integra DA models, the 1992 JDM Acura Integra used a DOHC engine. This Honda ECU is also found in the same year range of JDM B16A Honda CRX / EF

PS9 – Rare and difficult to find the 4 door 1988-1991 Honda Civic EX utitlized this ECU, and came with an automatic transmission.

PW0 – The last of the OBD0 ECUs on this list is found in the 1989-1991 Honda Civic as well as the CRX SiR.  This ECU is also in the automatic transmission equipped 1990-1991 Integra XSi.

OBD1 Honda ECU List

Honda ECU 2

P05 – The first group of OBD1 Civic EG chassis used this ECU, and was found in the 1992-1995 Honda Civic CX.

P06 – Found in the 1992-1995 Honda Civic DX, this ECU is usually discarded when stepping up to a VTEC engine swap.

P07 – Our personal favorite Honda Civic with the incredible curb weight and already VTEC, this ECU is in the 1992-1995 Honda Civic VX. The Civic VX averaged 48 mpg long before anyone knew what a Prius was.

P08 – The JDM 1992-1995 OBD1 Honda Civic with a 1.5 liter D15B engine used this ECU. It’s not very common here in the States however.

P0A – Commonly discarded by those looking to step up to the VTEC H22 Prelude engine, this ECU is found in the OBD1 1994-1995 Honda Accord EX.

P13 – Great for any Honda engine swap and easily modified and chipped, this unit is in the 1992-1995 Honda Prelude VTEC using the DOHC 2.2 liter H22A engine.

P14 – Known for the earliest of four wheel steering setups, the 1992-1995 Honda Prelude Si came with the 2.3 liter DOHC H23A.

P27 – This JDM ECU is in the 1992-1995 Honda Civic EG with a SOHC 1.6 liter engine.

P28 – Easily one of the most commonly chipped Honda ECU found in many Honda swaps, this VTEC ECU is in the 1992-1995 Honda Civic EX, Si as well as the VTEC Honda Del Sol Si.

P30 – Not quite as common as the P28 the P30 is still a very popular choice when it comes to Honda swaps and converting to VTEC. This one is found in the OBD1 1992-1995 Honda Del Sol with the 1.6 DOHC VTEC B16 as well as the SiR models.

P61 – The black sheep of the Integra DA, this ECU is in the 1.7 liter DOHC B17A. You will need to locate a 1992-1993 Acura Integra GSR to locate this unit.

P72 – The second most popular Honda ECU on our list. This ECU is commonly chipped and modified for turbocharged or supercharged purposes. You can source this ECU in the 1994-1995 Acura Integra GSR. There is a OBD2 version of this ECU as well which has completely different ECU wiring.

P74 – This OBD1 ECU is in the 1992-1995 Acura Integra with the non-VTEC DOHC B18 engine. The common trim type is the Integra LS or GS.

P75 – Much like the P74 this ECU is in the OBD1 1992-1995 Acura Integra LS or GS with the non VTEC B18 engine.

OBD2 Honda ECU List

P72 – From the 1996-2001 Acura Integra GSR with the VTEC B18C1, this ECU is extremely popular. Again there is an earlier model of this vehicle, so make sure not to get confused as the ECU wiring is very different.

Honda ECU 1P73 – Not quite as rare as other JDM only ECUs on this list the P73 is found in the OBD2 Integra DC5. This is also known as the 1996-2000 Acura Integra Type R, and the ECU is used in both the JDM and USDM models.

P75 – This is the Honda ECU you’ll be removing when planning for a LS/VTEC Swap. It’s found in the 1996-2000 Acura Integra LS and GS.

PBA – Found north of the border the 1997-2000 Acura 1.6 EL is an OBD2 Honda that’s a Canada only model.

PCT – These JDM ECUS are in the OBD2 Honda from the year range of 1997 to 2001. It’s in the JDM DC5 or Type R as well as the Civic Type R.

PCX – In the early AP1 S2000, the Honda S2000 from the year range of 1999 to 2001. With the F20C engine with a rear wheel drive layout, the S2000 has lots to offer for Honda enthusiasts.

PR4 – The early non VTEC Integra LS used this unit, and it’s found in the 1.8 liter DOHC 1996-1999 Acura Integra with the B18B engine. It carries the LS, RS or GS trim and a commonly swapped ECU for LS VTEC swaps.

P5P – The Prelude got heavier and bulkier in the 1996-1999 Type SH and Type S models. This ECU is connected to the H22A 2.2L VTEC engine and used for anyone planning a H series swap.

P2E – The next generation of Honda Civic DX, this ECU is in the 1996-1998 model years.

P2N – This OBD2 Honda Civic HX is known for their lightweight wheel rims, and is in the 1996-2000 year ranges.

P2P – One of the rare SOHC VTEC Honda ECU is found in the 1996-2000 Honda Civic EX. This model features the 1.6 liter D16Y8 and can be modified although not as easily as the P28.

P2T – Rare to find and harder to source, this computer is in the OBD2 Honda Civic Si with the 1.6 liter B16 in it.

Common Honda ECU FAQ

How can I tell if my Honda ECU is an automatic or manual transmission model? – There are segments of three digit code that follows the ECU code. These groupings of identification numbers will tell you if you have a auto or manual transmission.

For all OBD0 Honda ECU units the three digit codes break down as follows. OBD0 Manual transmission ECUs will have these three digit groupings following the ECU code.

  • 000
  • 001
  • 002
  • A00
  • A01
  • A10
  • J00
  • J001
  • C01
  • C00

Automatic transmissions will have these codes :

  • J51
  • J50
  • A50
  • A51
  • 900
  • 901
  • A60
  • C50
  • C51
  • X30
  • A80

OBD1 ECU’s with a manual transmission will have these groups of three digit codes 000, 001, 002, 003, A00, A01, A02, C00, C01, C02, J00, J01, J02 and the automatic transmissions will feature J50, J51, 900, 901, 902, C50, C51, C52, A50, A51, and A52.

Have any questions about our Honda ECU Master List? leave us a comment below and let us know!


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83 COMMENTS

  1. John huh .I find your knowledge on Honda computer s very helpful..now I know ive discuss this K-24 engine swap im doing I have a question. .I just don t know or can make up my mind on a manual or automatic transmission. .today I went n got the computer s out of the accord we talked about…my transmission guy in baton rouge tells me the cv joints have to be custom made using a accord and a accura keep in mind im just gather ing up parts to do this build. ..my wife is doing a 68 Camero. .I just wanted to ask u is he right about the cv joints. ..and what s the up side to automatic vs manual transmission. ..the Camero is pretty forward. ..it has no computer s wait till I send pictures of it. .im gonna do the honda the same way body work what u think bout him building the cv joints and manual vs automatic transmission? ?. Confused before I get started Paul

    • Hi Paul! Thanks for the kind words we try our best!

      As far as a transmission, I would recommend the six speed out of the Accord, that would be a great swap! When you need custom axles just give us a ring or drop us a line! We carry driveshaftshop axles that bolt right in. And yes the transmission choice will matter to which axles you will need for your K series swap. Pick your transmission and just let us know if you need axles!

      Thanks again, and glad to be of any help to you and your swap! Looking forward to the pictures of the 68!

  2. hi, I have a 97 Honda 4 dr VTEC. I had my ecu swapped to a PBB which is the wrong box. I’m in the Philippines. I think my ecu should be P2M but I didn’t see it on your list. Thx, Mike

  3. Hi. I have a 1994 HONDA CIVIC DEL SOL S 1.5L AT . Currently there is a P06-A52 ECU in it. I believe my ecu is no longer working. (We have narrowed it down to an ECU failure. I have spark. Fuel pump runs when I jump the main relay harness. I tested continuity and voltage on main relay harness and determined pin 1 and 6 coming from the ECU was the issues.) I am looking to borrow a friend’s P06 ECU that is for a manual. If it works, will I be able to use it or do I need to reconfigure something within the ECU for it to work within an auto?

    • Hi Stephanie, you can run the manual transmission ECU, but you may need to knock down your base timing a bit. Your transmission ECU is not affected. Best of luck and let us know how it turns out!

  4. How do i know the difference between a coupe ecu and a sedan ecu? I put a vtec motor in a 97 hatch with a p2p335 ecu and cel is on for fuel tank pressure sensor. Hatch never had the sensor, only cali sedans had them and all coupes had them. So my ecu is from a coupe, how do i know what ecu came from a sedan? Or is ther another way to remedy this?

    • Good day David. Thank you for reading and commenting.
      For automatic Civics, the Honda Civic ECU you are looking for is either 37820-PLR-L57 or 37820-PLR-A51. If you have a manual transmission the A/T ECU will work just fine as well. Hope that helps sir!

  7. I have a 99 HX , that used to be an auto but was converted to manual before I bought it.
    I have been trying to complete a B18B1 swap, but I can’t seem to find a good pinout for the p2m Ecu i have in the car. It seems to use Connectors A B C D. Everything I have found is A C D/ A B C.
    I have managed to get the car running with a OBD2B to OBD1 with a P75 but it wont idle.
    Any thoughts or do you know of a pinout that shows all 4 connectors being used?

  9. I happened to come across a 37820-PAB-A04, I cant find any wiring info, I mean nothing..I was wondering which motor it belongs to and what all can be done to or with it?

  10. I just purchased a 97 civic coupe with an h22a and I’m trying to to get the vehicle inspected in NY but they can’t get the emissions tester to communicate with the cars computer. The vehicle has a p06 ecu which as I’ve been reading seems to be the wrong one. Would replacing the ecu with a p13 help my situation at all?

    • Hey Jose, sorry to hear about your emissions problems. As far as your state is concerned though, unfortunately I don’t know enough about the state laws to comment. While going with a P13 or P72 is a must, I don’t know if your state requires anything more than that. If it’s simply a matter of your state smog official plugging into the OBDII component of your vehicle, you’ll need the right ECU.

      Hope that helps, thanks for reading

  11. Hi I have a 97 civic coupe with an h22a that I just purchased I’m trying to inspect the vehicle in NY but the inspectors can’t get the emissions test to communicate with the vehicle. The car has a p06 which I’ve been reading is the wrong ecu will changing the ecu to p13 help my situation at all

    • If you are retaining an OBDII Honda swap, it’s best to stick with a P28. Do you need to pass emissions from your tailpipe or is just from your OBDII codes? This really matters when it comes to smogging your Honda engine.

    • Hi Cheri, are you swapping in a 2008 Civic engine into your 2006? If so this isn’t a very common Honda swap but one that can be very easy. Is this a SOHC one for one swap?

  13. Hi, I have a 93 Del Sol S with the 1.5 liter. Will this ECU work? # 37820-P27-B00 it is brand will it need programmed? Or can I just put it in and it will work?

    • Hi Merrill, your P27 Honda ECU can run your 1.5 as it’s still a OBD1 platform. What you may want to do if you want more performance is look into a P28 Honda ECU instead, which opens up many more options when it comes to the aftermarket.

      Thanks for reading

  14. I have a 2002 honda civic ex auto trans i i need a ECU and I plan to turbo my car so what is the best ECU to use

    • Hi Tim, thanks for commenting.

      When you say you are planning on a turbo Civic build, what kit are you using? Will the kit come with an ECU? Or are you piecing it together? If so what might be your best bet is looking into an AEM EMS engine management unit.

      Let us know how your Honda project turns out! Thanks for commenting on our Honda ECU guide!

  15. Im putting a h22 out a 97 prelude in my 95 acura integra none Vtec.
    My question is what ecu should use the p5p out the prelude, or the p74 or p75 out the acura. I’m putting a turbo on the h22. Also can hondata be put on the p5p

  18. Hello dear I have Honda Civic 1.5 2000 ex Japan assembling so kindly guide me what’s the ECU best for me and also OBD which I use .

  19. Great information! Do you have any thoughts on running a JDM ECU on a USDM H22A4?
    Bought the car and didn’t know this was swapped until it failed emissions!
    Running a PRELUDE | 1997 | 2DR BASE | KA 5MT
    ECU is a 37820-p5p-003 -095-101502
    Says I should be running a 37820-P5M-A02 ECU.
    Is this safe/smart to run? What are the pros/cons?? Thanks!

    • Hi Dave! thanks for reading

      so the 37820-p5p-003 Honda ECU is from a Type S, so that’s awesome! Unfortunately you won’t be passing emissions anytime soon with it, so boo! If you are looking for performance, I would recommend picking up a factory ECU to ensure you pass smog. You can swap the ECU back once you pass and keep that factory Honda computer handy as a backup.

      You will see slight gains by running this ECU, but you won’t realize full potential until you get tuning and additional upgrades for your H22A4.

      Hope that helps! Thanks for commenting!

  20. I’m curious on something and I’d like to see what you say.
    I’m planning a b16a2 m/t swap into a 98 civic ex, coupe. From the research I’ve done, it’s a pretty basic swap. My problem, is finding the right ECU.
    I’ve read that I would need a P2T from the 99-00 Si, and a piggyback from obd2a to obd2b.
    However, I am in California, and I’ve read that JDM P2T ECUs have a hard time with smog.
    So basically my questions:
    Is the P2T the correct computer?
    Also is there a way to identify a JDM one from a USDM?
    And what three digit code would I need for the correct computer?

  22. Hey guys, I picked up a used PCM that has the same part number…. all except for the last number is 1 instead of 4.
    i understand that is just the version but is this PCM going to work fine or is it going to have problems with a function or two in the box?
    old pn# 37820-rno-a84
    new pn# 37820-rno-a81

  23. Hi guys,

    My 96 SI H23 is burning oil like crazy. So I am going to replace the engine with a JDM H22 OBDII. I know that my 96 is OBDII and I do need to pass inspection. I still haven’t quite wrapped my head around which ECU I need to use. Do I need to pull one from an a4 or mod my current ECU? or other options?

    Thanks!

    • Hi Dan, thanks for reading

      So your H23 is burning oil which is normal for a Honda engine, if you are going H22 are you also converting to VTEC? That’s going to be a big question and part of what you need for a successful Honda swap.

      let me know and I’ll try to help!

  24. Hi I have 96 honda prelude 2.2 vtec I have just started auto cross racing car not vtecing right . I think the ecu in it is p05 what ecu can I fit to it make it vtec better. Any help would be great. ..

  25. Hi i recently swapped a 95 accord lx 5speed for a 97 vtec and kept the 5 speed transmission. My ecu is a poa ao1 but im haveing problems with my tach jumping to high to low then jerks and have had it stall while driveing. Ive changed the distributor and cap plug wires starter switch and lock cylinder. Checked my o2 sensors up stream and down stream. Checked all my wiring twice . Was told that its got to be my ecu. So what ecu should i be useing to fix my problem.

  26. Ok so I’m hopping you will be able to help me out cause I can not find anything online anywhere about it. So I bought a 97 prelude for. $400 bucks, the only thing wrong was the owner was riding Bart home from work an fell asleep an someone stole her bag witch had her car key in it. So I paid $300 bucks to get a key made for it since there the first Honda with a chipped key. I got the key made the Lil green key light go’s off but I’m still not getting any communication between the ignition an starter? But I’m getting power everywhere else even the fuel pump. So I turned the ignition to the run position an jumped the starter an it cranked but no start so I then checked to see if it getting spark an that’s what I’m not getting. So I’ve done everything I can think of an still nothing so I’m thinking the key I got made isn’t right or something an have just decided to bypass the immobilizer cause I need to get to work an can’t keep dumping money into it. So what are your thoughts? Do you know how to remove the immobilizer chip from a p5m ecu? I can find any other ecu immobilizer removal video but not one for the p5m ecu. If not sure what’s the best ecu to use that’s not gonna have a immobilizer?

    • Hi Brandon, thanks for reading and commenting.

      You will need an aftermarket immobilizer bypass to get things working right, either that or head to your local Honda dealership. Hope that helps. Let me know how it turns out!

  27. hello…. Do the p28 and p75 have the same plug pattern. Can I use either with not jumper harness and if so which one is better for my 94 integra b20 swap. it has a p75 ecu

  28. Hi John,

    I have a 97 honda civic hatch back. Im in california and care about the emissions. I have a code indicating my fuel tank pressure sensor is bad. I can not find that sensor, and went to see if I could measure the signal at the ecm. I have a p2p-335. Any chance you know where I can find a pin out for this ECM, or the dang sensor?

    • Hi Dave, this sensor is part of your rear gas hatch or tank. The wiring should be the same for all EK chassis. Let me know if you still need this, and I can look up what yo uneed.

  29. Hi need help i have 1992 and misses the current in a particular RPM somewhere like 1500 to 2000 can you help…
    My mechanic said it’s the ECU

  30. Okay I have a 99 Honda Accord four-door with automatic transmission it had the security key. I took it out and replaced it with a normal key and tried installing the security delete chip do you know where I can find the directions on which way that chip goes in the ECU.

    • if you mean the Honda security keys, you won’t be able to bypass without a third-party piggyback. Did you change your keys or have a new set cut or something?

  31. Hi John,

    I recently acquired a 94 del sol with the 1.5 non vtech motor. The car is auto but I also have a B18c1 GS-R motor and 5 speed transmission but the car did not come with a harness or a ecu for the swap. The goal is to convert the car to manual and run the b18c1 in this del sol but I am not sure if obd1 or obd2 matters or which is better or what kind of harness would be needed with either. Any help and direction on this to help me get proper items without wasting money with a try and retry system would be greatly appreciated

    • Hi there Dave!

      sounds like a cool project! okay so if its a 94 and Im assuming still OBDI, it’s easiest to stick OBDI and complete your B series swap!

      Let me know if you need any further help! can definitely assist where needed!

  32. I have a 1998 Acura integra ls with a b18b1 engine and I want to swap it with a 1997 b18c vtec engine with a manual transmission. I need to know which is the correct ECU to use. I am in California and I do not want any problems being able to smog it. The number stamped on the engine block is B18C 1201550. I would appreciate any and all help. Thank you.

  33. Hi Paul
    Badroedien here
    I’m doing a b20b VTEC swop in my 99 Honda civic
    It had a d16y9 engine in before and a 5 speed manual gearbox
    Which ecu do I need now to make the VTEC work

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