2012 FXDC Throttle / TPS Issues
Thread Starter
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4th Gear
Joined: May 2025
Posts: 8
Likes: 1
From: Montoursville, PA
2012 FXDC Throttle / TPS Issues
Im at the end of my rope on this one.
I bought this 2012 Dyna Super Glide Custom in August. Love it. She rips. In November, I feel like I won the lottery when I realized there was a V&H FP4 tucked under the seat. I dont know what was flashed to the ECU when I bought the bike, but as soon as I flashed a map with the FP4 I started getting diagnostic codes for the TPS (P0122 and P0123 high/low open). Weird coincidence, I have no idea.
Screw it, threw $50 at Dennis Kirk and bought a new TPS. But codes wont clear and the issue is still there. I dont think it has had an impact on performance so I just dealt with looking at the check engine light all winter.
Today I finally got around to diagnosing what the hell is going on. Bought an OEM TPS from the local Harley joint and ran into the same issue. But I at least was able to start seeing an issue. When the TPS is plugged in but not hooked up to the throttle body I get no TPS codes. But when I put the TPS on loosely without screwing it in, its not aligned with the bolts (rotated further than the bolt pattern expects). This means that when its not hooked up, TPS shows 0% throttle position and when its hooked up it shows 7% throttle position. So its not a TPS issue, its an issue with the throttle getting stuck open a little.
The throttle cables arent holding it open. The throttle stop screw on the throttle body isnt keeping it from closing. I sprayed it real good with throttle body cleaner. Nothing helps.
What would keep the throttle from closing to the 0% point on the TPS? I genuinely dont know what else to check and Im so f***ing frustrated. Or am I missing something to reset the zero point of the TPS???
Sorry for ramblings and typos. If something doesnt make sense, please ask. Todays post is sponsored by Daydrinking with Miller Lite.
I really really appreciate some guidance from the community on this one before I take it to a mechanic.
I bought this 2012 Dyna Super Glide Custom in August. Love it. She rips. In November, I feel like I won the lottery when I realized there was a V&H FP4 tucked under the seat. I dont know what was flashed to the ECU when I bought the bike, but as soon as I flashed a map with the FP4 I started getting diagnostic codes for the TPS (P0122 and P0123 high/low open). Weird coincidence, I have no idea.
Screw it, threw $50 at Dennis Kirk and bought a new TPS. But codes wont clear and the issue is still there. I dont think it has had an impact on performance so I just dealt with looking at the check engine light all winter.
Today I finally got around to diagnosing what the hell is going on. Bought an OEM TPS from the local Harley joint and ran into the same issue. But I at least was able to start seeing an issue. When the TPS is plugged in but not hooked up to the throttle body I get no TPS codes. But when I put the TPS on loosely without screwing it in, its not aligned with the bolts (rotated further than the bolt pattern expects). This means that when its not hooked up, TPS shows 0% throttle position and when its hooked up it shows 7% throttle position. So its not a TPS issue, its an issue with the throttle getting stuck open a little.
The throttle cables arent holding it open. The throttle stop screw on the throttle body isnt keeping it from closing. I sprayed it real good with throttle body cleaner. Nothing helps.
What would keep the throttle from closing to the 0% point on the TPS? I genuinely dont know what else to check and Im so f***ing frustrated. Or am I missing something to reset the zero point of the TPS???
Sorry for ramblings and typos. If something doesnt make sense, please ask. Todays post is sponsored by Daydrinking with Miller Lite.
I really really appreciate some guidance from the community on this one before I take it to a mechanic.
Thread Starter
|
4th Gear
Joined: May 2025
Posts: 8
Likes: 1
From: Montoursville, PA
FP4 doesnt have that capability based on the options presented to the user. I sent V&H an email. I think youre right and my brain was processing this as an issue with physical components. Will report back!
Thread Starter
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4th Gear
Joined: May 2025
Posts: 8
Likes: 1
From: Montoursville, PA
I flashed the stock map and it is still an issue. That was my first action.
There might be a throttle position setting in the FP4. Its not something that shows up for me in the settings, but I sent an email to V&H for support.
Thread Starter
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4th Gear
Joined: May 2025
Posts: 8
Likes: 1
From: Montoursville, PA
Yeah thats all good. Not the issue there.
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Thread Starter
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4th Gear
Joined: May 2025
Posts: 8
Likes: 1
From: Montoursville, PA
Took it to the local HD dealer and they flashed it back to stock. All codes clear. TPS showing full closed when the throttle is closed. VSS is displaying the correct gear on my odometer. All is good again. This was an issue with the FP4 tuner and/or the map that it flashed. Vance & Hines sent me a modified map based on the stock map from HD. A little nervous to flash that since all of the error codes have cleared
.
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Thread Starter
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4th Gear
Joined: May 2025
Posts: 8
Likes: 1
From: Montoursville, PA
I decided to roll the dice and download/flash the new stock map in FP4. No check engine lights. Ill try to run autotune based on that map and see what happens.
Feels like progress.