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.
Currently dealing with this issue. Intermittent crank no start, when it starts then car stalls 5 to 15min later whilst driving. P0685 code comes and goes. Relay replaced, issue is still there. Battery cables are clean and tight, currently at a shop for diagnosis and will follow up. Super frustrating issue.
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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.
Currently dealing with this issue. Intermittent crank no start, when it starts then car stalls 5 to 15min later whilst driving. P0685 code comes and goes. Relay replaced, issue is still there. Battery cables are clean and tight, currently at a shop for diagnosis and will follow up. Super frustrating issue.
What they tell you??
I have this code , but no crank or start issues
Same