Ignition/Tuner/ECM/Fuel Injection Need advice on ignition issues? Questions about a tuner? Have questions about a EFI calibration or Fuel Injection? Tips on Engine Diagnostics, how to get codes, and what they mean. Find your answers here.

Intermittent P0122 Code.

Thread Tools
 
Search this Thread
 
Old Jan 20, 2016 | 01:22 PM
  #1  
Garrman's Avatar
Garrman
Thread Starter
|
Cruiser
10 Year Member
Liked
Joined: Nov 2014
Posts: 155
Likes: 12
From: San Jose, CA
Default Intermittent P0122 Code.

Hi Guys,


I searched the forum but didn't find an example like what I am experiencing. This is my issue of the week.


The Bike is a 2002 FLHPI Road King. Mods include SE AC, V&H slip on, PC III and cams.


The issue is I keep getting a P0122 code. It never shows up as a current code, it is always stored as a historic code. It is possible that the engine light comes on for a moment while I'm riding and I don't notice it.


I have checked the wires at the end of the connector and as far as I can tell are ok. I have a DVM and can try to back probe it while turning the throttle to check for drops or spikes but not 100% clear on how to do that.


I have read that the PC III can sometimes cause this code, not sure about that.


Anyone else experienced this?


Any troubleshooting tips appreciated.


Thanks,
Garrman
 
Reply
Old Jan 20, 2016 | 02:57 PM
  #2  
Vernal's Avatar
Vernal
Club Member
10 Year Member
Shutterbug
Liked
Loved
Joined: Apr 2013
Posts: 7,681
Likes: 8,413
From: Utah
Riders Club Member
Default

Here are a few pages from the 2004 Electrical diagnostic manual. Hope they help.










 
Reply
Old Jan 20, 2016 | 03:32 PM
  #3  
Garrman's Avatar
Garrman
Thread Starter
|
Cruiser
10 Year Member
Liked
Joined: Nov 2014
Posts: 155
Likes: 12
From: San Jose, CA
Default

Hi Vernal,


Holy cow! Thanks for the information. I'll work the flow chart and let the board know what I find.


Thanks again, I appreciate it.


Garrman
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
dyna07custom
2014-2024 Touring Models
4
Oct 14, 2015 06:08 PM
Chaseg08
Softail Models
10
Sep 13, 2012 10:46 PM
gmeigel
Touring Models
3
Aug 24, 2010 02:38 PM
GreighWolf
Touring Models
10
Jan 17, 2007 10:27 AM
GreighWolf
Ignition/Tuner/ECM/Fuel Injection
2
Jan 16, 2007 12:44 AM




All times are GMT -5. The time now is 07:43 PM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE