2009 420 es/auto shifting problem - Honda ATV Forum
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post #1 of 4 (permalink) Old 04-09-2018, 03:07 PM Thread Starter
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2009 420 es/auto shifting problem

I have the 2009 420 that I'm having a weird shifting issue with. And I'm completely lost.
It's the ESP/auto shift model.
ESP Will only shift up when you let it come back down to a idle. Can't get it any higher than 4th. Down shifts is the same, needs to idle down. Shifts from n to 1 and back and n to reverse and back perfectly normal.
Auto mode will not upshift at.
If you unplug the speed sensor is will shift through 1-2-3 in ESP fine at any speed or rpm, will no go into 4 or 5 though and auto won't work.
New oem angle sensor last year. Not throwing the same symptoms as when it messed up before. Have a new sensor ordered.
Any other ideas? All plugs are clean and have dielectric Greese in them. Grounds clean. No codes flashing. Dosent throw the "-" between gears like when a angle sensor normally goes bad.

Last edited by Jacobh; 04-09-2018 at 04:33 PM.
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post #2 of 4 (permalink) Old 04-10-2018, 06:11 PM Thread Starter
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Update. Drove it a bunch today. Finally threw a code and locked in 4th gear. But it's throwing code 67 and as far as I know that dosent exist. 6 long flashes and 7 quick. Going to dealer tomorrow to scan it
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post #3 of 4 (permalink) Old 04-10-2018, 09:52 PM
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See attachment for code 67 (67-1, they are the same). Welcome to the forums!
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post #4 of 4 (permalink) Old 04-11-2018, 06:55 AM Thread Starter
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Thank you very much. Couldn't find that anywhere. Found to be a broken wire right by the front vs sensor plug. Front mount on the front end broke and cut a wire. Thanks again!!!

Last edited by Jacobh; 04-11-2018 at 08:19 AM.
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