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Thread: ECM code being thrown due to altitude

  1. #1
    550+ Posts GoSlo's Avatar
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    Default ECM code being thrown due to altitude

    A friend of mine just bought a 2018 TriGlide and now both times he's ridden it up into the mountains, it's throwing an ECM code. He talked to one dealership and they said it is a known problem with altitude and the ECM. The trike is set so lean that the rear cylinder isn't running right (?). Not positive on all the particulars, but he keeps getting the same code show up. They said they're pretty sure he'd be fine to just ride it, but he's worried about getting stuck up in the mountains and needing it towed if it stops running.

    Has anyone else heard about or experienced this problem?

    Side note: I bought my new 2018 the same week from the same dealership and have not had the problem....yet.
    ...Barry
    Ride Hard - Ride Fast - I'll catch up sooner or later
    2018 TriGlide • DK 14" lifts and shocks, tank lift, deflector wings, Mighty Mite Love Jugs

  2. #2
    550+ Posts GoSlo's Avatar
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    Forgot to say this about the ECM code. Here in the Denver area, we're about 5,000 - 6,000 feet in elevation and it doesn't throw the codes in town. When he gets above 7,000 feet or so, that's when it happens.
    ...Barry
    Ride Hard - Ride Fast - I'll catch up sooner or later
    2018 TriGlide • DK 14" lifts and shocks, tank lift, deflector wings, Mighty Mite Love Jugs

  3. #3
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    Nah, I don't buy it

    If that were true ALL Harleys shipped from the factory would have the wrong fuel maps loaded in the ECM

    Find another dealer JMO
    Nuff Said," Were Burnin Daylight, Lets Ride"(Sober 37 years)
    Current ride : 2021 FREEWHEELER M8, oldest ride 1960 FL

  4. #4
    5000+ Posts MDO's Avatar
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    Default

    Quote Originally Posted by GoSlo View Post
    A friend of mine just bought a 2018 TriGlide and now both times he's ridden it up into the mountains, it's throwing an ECM code. He talked to one dealership and they said it is a known problem with altitude and the ECM. The trike is set so lean that the rear cylinder isn't running right (?). Not positive on all the particulars, but he keeps getting the same code show up. They said they're pretty sure he'd be fine to just ride it, but he's worried about getting stuck up in the mountains and needing it towed if it stops running.

    Has anyone else heard about or experienced this problem?

    Side note: I bought my new 2018 the same week from the same dealership and have not had the problem....yet.
    I have no idea what your talking about with the rear cylinder being lean & not running.

    It would help if you mentioned what trouble code it is throwing.

    Help us help you.
    2017 Harley Davidson Freewheeler (107 cu.in. vivid black).

  5. #5
    550+ Posts GoSlo's Avatar
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    Quote Originally Posted by MDO View Post
    I have no idea what your talking about with the rear cylinder being lean & not running.

    It would help if you mentioned what trouble code it is throwing.

    Help us help you.
    I don't know any more than what I've written. He doesn't know how to get the actual code, so all he can see is ECM Y. We know there's a way to do it, we just don't know what the steps are. Maybe if someone can explain that part, then I can post the actual code.

    Thanks again....
    ...Barry
    Ride Hard - Ride Fast - I'll catch up sooner or later
    2018 TriGlide • DK 14" lifts and shocks, tank lift, deflector wings, Mighty Mite Love Jugs

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  7. #6
    550+ Posts GoSlo's Avatar
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    Default

    He figured out how to get the actual code and it says this:

    ECM Y

    P0152

    Rear oxygen sensor high / engine rich

    Hope this helps.
    ...Barry
    Ride Hard - Ride Fast - I'll catch up sooner or later
    2018 TriGlide • DK 14" lifts and shocks, tank lift, deflector wings, Mighty Mite Love Jugs

  8. #7
    13000+ Posts FuzzyWuzHe's Avatar
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    Default

    Quote Originally Posted by GoSlo View Post
    I don't know any more than what I've written. He doesn't know how to get the actual code, so all he can see is ECM Y. We know there's a way to do it, we just don't know what the steps are. Maybe if someone can explain that part, then I can post the actual code.

    Thanks again....
    It's in the owners manual I think ... but, basically you hold the trip button down while turning the key on

  9. #8
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    Quote Originally Posted by GoSlo View Post
    He figured out how to get the actual code and it says this:

    ECM Y

    P0152

    Rear oxygen sensor high / engine rich

    Hope this helps.
    That would be TOO much fuel causing that code

    The dealer needs to hook it up to the digital technician scanner again to see why it is throwing too much fuel

    Or the rear cylinder is not firing

    Has this trike any modifications or is it stock?
    Nuff Said," Were Burnin Daylight, Lets Ride"(Sober 37 years)
    Current ride : 2021 FREEWHEELER M8, oldest ride 1960 FL

  10. #9
    13000+ Posts FuzzyWuzHe's Avatar
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    That's what I was getting when the O2 sensor clogged ... is there soot in the pipes?

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    Quote Originally Posted by FuzzyWuzHe View Post
    That's what I was getting when the O2 sensor clogged ... is there soot in the pipes?
    I bet there is raw gas smell in the muffler

    The ECM should compensate for the altitude unless it has been monkeyed with by the dealer already?
    Nuff Said," Were Burnin Daylight, Lets Ride"(Sober 37 years)
    Current ride : 2021 FREEWHEELER M8, oldest ride 1960 FL

  12. #11
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    Default Trip to Dealer

    GoSl said in the original post "A friend of mine just bought a 2018 TriGlide and now both times he's ridden it up into the mountains, it's throwing an ECM code. He talked to one dealership and they said it is a known problem with altitude and the ECM." So, he talked to a dealer, but has the bike actually been carried to the dealer? It definitely needs to be seen by the dealer.

    16 TGU Mysterious Red / Velocity Red. FM Ceramic Head pipe and FM E-Series tunable exhaust. PV Target Tune-AT WB Tuner. DK Outlaw 606 AC with EBS, Ward’s FCS fans. DK Custom Oil filter/Cooler relocation kit, Comfort Lift and 14 inch shocks. DK tank lift, wind deflectors, floorboard extenders, and tour pak relocator. Chrome TGU wheels. Bad Ass Lights tail lights. Lighted controls and Krome Works 2+2 narrow handle bars.

  13. #12
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    Quote Originally Posted by MDF48 View Post
    GoSl said in the original post "A friend of mine just bought a 2018 TriGlide and now both times he's ridden it up into the mountains, it's throwing an ECM code. He talked to one dealership and they said it is a known problem with altitude and the ECM." So, he talked to a dealer, but has the bike actually been carried to the dealer? It definitely needs to be seen by the dealer.

    Good call

    I am wondering if this trike has any factory add ons like maybe a tuner with the wrong map?
    Nuff Said," Were Burnin Daylight, Lets Ride"(Sober 37 years)
    Current ride : 2021 FREEWHEELER M8, oldest ride 1960 FL

  14. #13
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    I call BS on this being a known problem. If a dealer tech did troubleshooting on the bike and said this he's full of it. I just got back from the Deadwood 3 Wheel Rally and afterward we went to Cody and then down to Colorado. I rode to the top of Pike's Peak and never got a code nor any runability problem. Something is malfunctioning or like others have said it must not be stock and has a bad tune or needs a tune.

  15. #14
    550+ Posts GoSlo's Avatar
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    Default

    Lots of posts to reply to, so hopefully I get them all answered.

    The trike is stock, no mods at all.

    he has taken it in to a dealer to have it looked at, twice now. They clear the code and it comes back again once he gets above around 7,000 feet.

    He was told this is a known problem on SOME M8's, but not all. I have a brand new 2018 TriGlide, and have not had the problem.

    He's bringing it in again tomorrow, but I figured I'd see if anyone else has this problem or had heard about it.
    ...Barry
    Ride Hard - Ride Fast - I'll catch up sooner or later
    2018 TriGlide • DK 14" lifts and shocks, tank lift, deflector wings, Mighty Mite Love Jugs

  16. #15
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    Default Thanks

    Thanks for clearing that up. So it is the factory stock tune and not a "tuner" file. After the 3rd trip to the dealer, if it still does it I would at least call a couple of other HD dealers service department and see if they have ever seen this problem and code. Keep us posted.
    16 TGU Mysterious Red / Velocity Red. FM Ceramic Head pipe and FM E-Series tunable exhaust. PV Target Tune-AT WB Tuner. DK Outlaw 606 AC with EBS, Ward’s FCS fans. DK Custom Oil filter/Cooler relocation kit, Comfort Lift and 14 inch shocks. DK tank lift, wind deflectors, floorboard extenders, and tour pak relocator. Chrome TGU wheels. Bad Ass Lights tail lights. Lighted controls and Krome Works 2+2 narrow handle bars.

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    Quote Originally Posted by GoSlo View Post
    Lots of posts to reply to, so hopefully I get them all answered.

    The trike is stock, no mods at all.

    he has taken it in to a dealer to have it looked at, twice now. They clear the code and it comes back again once he gets above around 7,000 feet.

    He was told this is a known problem on SOME M8's, but not all. I have a brand new 2018 TriGlide, and have not had the problem.

    He's bringing it in again tomorrow, but I figured I'd see if anyone else has this problem or had heard about it.
    I've not heard of it.

    I would be hesitant to take it back to the same dealer a 3rd time...they had two chances to fix it already.

    Best advice is for your bud to call around and see if any other dealers have heard of this known problem with some M8's. If one of them has, next question is, do they know how to fix it?

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  19. #17
    550+ Posts GoSlo's Avatar
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    Like many suggested, it's the O2 sensor that's causing the problem, much like the 2012 bikes that were sold here at altitude. In 2012 a lot of the bikes experienced pinging when riding in the mountains. Harley came out with a new download for altitude to stop the pinging. I had a 2012 Limited and it pinged like crazy until they got it fixed. Seems as though that's what they're going to do now as well.

    He called two other dealerships and they've all seen the same problem. Not on all M8 bikes/trikes, just some. So now he has to wait for Harley to send back a new file to download into the ECM.

    Thanks to all that offered help/ideas/suggestions!
    ...Barry
    Ride Hard - Ride Fast - I'll catch up sooner or later
    2018 TriGlide • DK 14" lifts and shocks, tank lift, deflector wings, Mighty Mite Love Jugs

  20. #18
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    Default Which one?

    GoSlo said "Like many suggested, it's the O2 sensor that's causing the problem"

    Glad your friend is getting some help finally. Just one question, is it the O2 sensor that is causing the problem or is it the tune? Maybe a combination of both? Did they replace the rear O2 sensor? Maybe they can get him fixed up finally without all the trips to the shop. Good luck.
    16 TGU Mysterious Red / Velocity Red. FM Ceramic Head pipe and FM E-Series tunable exhaust. PV Target Tune-AT WB Tuner. DK Outlaw 606 AC with EBS, Ward’s FCS fans. DK Custom Oil filter/Cooler relocation kit, Comfort Lift and 14 inch shocks. DK tank lift, wind deflectors, floorboard extenders, and tour pak relocator. Chrome TGU wheels. Bad Ass Lights tail lights. Lighted controls and Krome Works 2+2 narrow handle bars.

  21. #19
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    Default

    Quote Originally Posted by GoSlo View Post
    A friend of mine just bought a 2018 TriGlide and now both times he's ridden it up into the mountains, it's throwing an ECM code. He talked to one dealership and they said it is a known problem with altitude and the ECM. The trike is set so lean that the rear cylinder isn't running right (?). Not positive on all the particulars, but he keeps getting the same code show up. They said they're pretty sure he'd be fine to just ride it, but he's worried about getting stuck up in the mountains and needing it towed if it stops running.

    Has anyone else heard about or experienced this problem?

    Side note: I bought my new 2018 the same week from the same dealership and have not had the problem....yet.
    I will call BS. Find another dealer. With the bike set to run lean, if anything, as altitude increases, it should run better due to a richer mixture with thinner air.......

    YMMV

    Lon

  22. #20
    550+ Posts GoSlo's Avatar
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    This is an update on my friends 2018 TriGlide that was throwing codes when he went up in altitude, usually above 7,000'. It stopped doing it!! He's still waiting for the new download from H-D, but for now it's not throwing anymore codes. Over time the codes were thrown less and less and the light stayed on for less and less time the more times it happened. No one seems to know why except that maybe it's "learning" better? Anyway, wanted to let you know what's been going on with this problem. I still have not had any codes thrown at altitude on my M8, so that's a good thing.
    ...Barry
    Ride Hard - Ride Fast - I'll catch up sooner or later
    2018 TriGlide • DK 14" lifts and shocks, tank lift, deflector wings, Mighty Mite Love Jugs

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