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P0685 Honda Accord 2005 - Relay - ECM/PCM Internal Circuit Malfunction (Power Control Circuit)
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- เผยแพร่เมื่อ 6 เม.ย. 2019
- Replace relay on 2005 Honda Accord. A P0685 error code was given and it caused the dashboard lights to flash on and off, ABS seemed to act up, power to the radio went off - but these were very quick intermittent problems. P0685 is ECM/PCM Internal Circuit Malfunction (Power Control Circuit)
The part is a Engine Control Module Wiring Relay item# 20580
Skill level: Beginner
Tools needed: None
Time required: 15 minutes
Cost: $40 or less (if you buy online it's cheaper)
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I had this problem on a 2003 Honda Accord ex v6 AT. Symptoms were Radio, and Dashlights would turn off while driving followed by car stalling for a split second. Headlights would dim or get brighter on acceleration and deceleration like the car is starving for electrons from the alternator (or serpentine belt loose?). The code came up P0685 on a blue driver.
The solution so far:
1) Checked the relays under the driver's side. EI main, IG coil, and since I was there Fuel pump. Took them off. Cut a regular house light wire. Somewhat held the relay end to the battery under the hood (Caution the relay is not protected anymore from the fuse box). I heard the relay click, concluding relay was good.
2) Cleaned the grounding wire surfaces around the engine bay from the black and white pictures I referenced on forums. The reference below is the Driver side/Passenger side instead of left and right.
Battery negative to Car wall (driver side), Car wall to Transmission (under air filter driver side), Battery positive harness traced to the throttle body (2 small wires)(driver side engine side), Battery positive harness traced to a bracket power steering pump/injectors (Passenger side on the engine), Motor mount to car wall Passenger side near the serpentine belt.
3) After cleaning the grounds and checking the voltage on the battery and alternator the code is gone. The battery grounds are referenced (C101, C102 etc on forums)
4) I got another code for the throttle body P2101. That was because I took the air filter housing off to get at the Grounded wire transmission to the car body. I probably should have cleaned the throttle body but didn't. I'll clean it next weekend. hopefully, that will get rid of the code.
Sometimes a bad electrical connection can throw this code. I got this code and cleaned up the corrosion on my battery terminal, and it fixed it. Wasn't even that bad!
I have a 2007 Honda Accord and your video was very helpful. The poor lighting wasn't a problem for me because I had already been in that spot and taken a photo of it, so your instruction just confirmed what I suspected. Thanks for posting this.
I was having the same exact issues as you I had the same engine code as well, I have the same exact car. I just changed mine this evening and drove about half hour home with no issues. I’m hoping this solved my problem. Thank you very much!
Thanks got my 2005 Acura RL up and running today.
Thanks for the video! Literally had this issue/error last night. Followed your video, easy enough, and shaBlam! Problem solved 🤞🏼
Just did this on a crv the other day, pulled the relay and tested would fail to engage roughly 1 out of 30 times problem solved after the relay was exchanged
What year crv and location for relay?
Can you test the relay with a meter?
@@TheCastedoneI’m late. But yes you can. Should show between 150-200ohm
@@TheCastedonealso good to hook it up to a battery and listen for a clicking noise. Repeat this multiple times.
bro!!!!!!!!! thank you soooooooooo much this just happened to me it worked for me made it home
Worked like a charm! Thank you
Thank for the info/video .very helpful!!
2nd making it the brown in upper row?
Hi William! Thanks for the video. I got this code when I scanned my 2005 Honda Accord and I did everything exactly as you showed here in this video. That was 3 weeks ago. Now the problem is back again. Could there be another big problem? I had purchased a brand new part from AutoZone when I replaced that piece 3 weeks ago. I was planning on driving my car cross country and now I’m scared of getting stranded if I drive the car. Can you please advise?
Kev Flores you could try returning the part and getting a new one especially if the code is back. I didn’t have any more problems in mine. But you don’t want to drive with the car with this issue.
Thanks so that was the relay for the fuel injection system ., Not the ecu ?
this code p0685 is showing up on my 2009 civic si , 🤞🏼 hope this works !
update, turns out my fuel injector ground wire was loose
Thanks you
The car is running great! However, the issue it has is the stereo and some of the dash lights won’t come on and the power locks and lights won’t work if the ignition is not turned on. Do you think this might work? I am going to replace any how. Will keep you posted! Thanks for your insight!
I have the same problem
Did it work for you replacing the relay like he did in the video ? My door locks are not working at all
Thanks buddy
Do you have to unplug the battery terminals before removing & installing the new Relay?
No you don’t need to. I didn’t.
He said take off the dope instead of saying door KMSL 🤣
I'm having this exact issue in my 2008 Honda Pilot. I'm having trouble with where to find the relay that I need to replace. Any help is welcome and appreciated.
You’re is probably an 8cyl and mine wasnt so it might be different place or relay. But mine was by your left leg on side wall, and near back of relay box.
Did it sometimes not read that you were in gear
What relay should i ask for in auto zone any name?
ECM power relay for the make/model of your car
My 04 accord is having problem w the Ac.somehow the compressor relay is not engaging the clutch compressor.When they jump it its fine.bug when reinsert the relay it stop working.some say might be the PCM.should I try changing that relay 1st before changing PCM?
Any luck?
@@3500savoy it was the Computer the whole time.
@@joebay1049 did you try the pcm? Or any other parts
@@3500savoy i change the pcm and it work
@@joebay1049 which relay? And what color?
Was your car starting at the time or did it need the new relay to start?
It would start but then shut off.
Flash light.
Is that relay the same on a Honda Element?
What is that relay called?
Changed the relays still it is showing the same code
Did you figure it out?
was it hard to pull the old relay out? im having the hardest time trying to remove the relay. Is there any tabs I need to press to unlock it? thanks
No tabs on mine. Try pliers and just pull straight out.
I’m, having similar issues. My accord has the same error code, it would shut off briefly and restart, someone said I need new battery , someone said I need new computer, someone said replace the battery terminal cables.
The relay fixed it. Its been months and no issues.
I'm gonna go out and buy a relay because I'm having the same exact issue
@@williamkincaid3222 quick question, do I need to replace both main relays or just one? looked up the part number on genuine honda parts and it says the require qty is 2?
I only did one and it’s been fine for months now
@@MoNeenja did you happen to narrow down this problem? I was told a similar story
What’s the part number
39794-sda-902
Relay part number please
#20580 at autozone
bad vedio
You can always get FREE advice somewhere else
Bad spelling, bad comment, bad attitude. Maybe you can offer some CONSTRUCTIVE criticism, asshole?