Check engine light
Thread Starter
|
Intermediate
Joined: Sep 2023
Posts: 37
Likes: 14
From: Tennessee
Check engine light
I got a question. Maybe someone can answer this and help me out. I have a 2011 ultra limited. Been having issues with with the map sensor and iat. I finally got it to run right. I was over thinking when I was working on it. I had changed head pipes and now I have returned it. It runs like a champ again. But the check engine light is staying on. I use the Dynojet PV4 tuner. I can check the map sensor while it is running and according to the ECM the map sensor is working because you can see the pressure change. But the bike keeps showing code p0108 . I was wondering because I changed map sensor it has tge ECM confused. I went with a fueling. Com map sensor. Should I get one from Harley. Any thoughts would be appreciated.
Thanks Jim
Thanks Jim
Cruiser
Joined: Nov 2025
Posts: 120
Likes: 78
From: Virginia
For your 2011 Harley Ultra Limited, the P0108 code means Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage, indicating the engine's computer (ECM) is getting an abnormally high voltage reading from the MAP sensor, often pointing to a faulty sensor, bad wiring/connections, or a vacuum leak. You'll likely see symptoms like rough idling, poor fuel economy, hesitation, or stalling, and should check the sensor, its wiring, and for vacuum leaks around the intake manifold to diagnose the issue.
I am thinking broken wire?
I am thinking broken wire?
Thread Starter
|
Intermediate
Joined: Sep 2023
Posts: 37
Likes: 14
From: Tennessee
When this first started I went threw everything. I checked for vacuum leaks. Checked fuel injectors. Changed map sensor, Checked fuel pressure and pulled tank to make sure I did have any water in the gas. Put the old map sensor back on and it still would not run right. I mean it would not idle and if you were riding you had to stay in it and it would run fine. It would stall at red light. Then I realized that it all started when I changed my pipes I have Cobra power port 2-1-2 whit V & H big ovel tips . So I returned the bike and it runs great no missing no stalling just the check engine light. I checked the wires when it first started. And the checked good. I was going to put the old Bosch map sensor. And see what it does but I guess I thew it way. But thanks for the information I guess I will go back check the wires
Thanks Jim
Thanks Jim
Thread Starter
|
Intermediate
Joined: Sep 2023
Posts: 37
Likes: 14
From: Tennessee
no I have not run any auto -tune yet . But I will do that tomorrow on my way to work.
Seasoned HDF Member
Joined: Aug 2006
Posts: 24,528
Likes: 30,847
From: Pennsylvania
My thought may not be correct or full of $hit; however, it is free to try. lol
As above also, check the connectors and wires going into the MAP sensor.
Trending Topics
Stellar HDF Member
Joined: Sep 2017
Posts: 2,144
Likes: 577
From: memphis
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,922
Likes: 8,027
From: poway
When this first started I went threw everything. I checked for vacuum leaks. Checked fuel injectors. Changed map sensor, Checked fuel pressure and pulled tank to make sure I did have any water in the gas. Put the old map sensor back on and it still would not run right. I mean it would not idle and if you were riding you had to stay in it and it would run fine. It would stall at red light. Then I realized that it all started when I changed my pipes I have Cobra power port 2-1-2 whit V & H big ovel tips . So I returned the bike and it runs great no missing no stalling just the check engine light. I checked the wires when it first started. And the checked good. I was going to put the old Bosch map sensor. And see what it does but I guess I thew it way. But thanks for the information I guess I will go back check the wires
Thanks Jim
Thanks Jim
Stellar HDF Member
Joined: Sep 2017
Posts: 2,144
Likes: 577
From: memphis
yep...the wires are so thin that they can break inside the insulation just from disconnecting the sensor plug. same as the induction module plug wires.