I recently began receiving the engine code P0374 on my 2015 Street Glide, 50K miles. At first, it started acting like it was missing spark, regardless of speed, and would sometimes just outright die; this would all happen within the first few miles of the ride. NOW, it is running fine except after I go through towns and get stopped by many red lights. When this happens, it starts to hesitate, which gets worse the more I have to remain idle; it looks to be heat-related, though it still sometimes pops the P0374 code. Below are the things that I have done to fix the issue, these things have really helped the performance, and though I doubt that these had anything to do with the issue, the base problem isn't nearly as bad as it was.

1. Replaced the cam position sensor (Twice with two different brands)
2. Replaced the entire fuel assembly.
2. Replaced the ignition coil, plugs, and wires.

TIA

 

I assume you mean you replaced the crank position sensor twice on your 2015, they don't have a cam position sensor. You might look at the front head temperature sensor. When they go bad they can cause some very erratic running conditions.

 

You don't mention how many miles are on the bike, also anyone been inside the cam chest recently?

P0374 CKP Sensor Synch Error EFI , here are the most common effects from this code, this code also means it is not seeing a signal from the Crank Position Sensor either all the time or intermittently.

What Is the P0374 Code on Harley-Davidson?

The P0374 code indicates a “Timing Reference High Resolution Signal A No Pulses” error. The Engine Control Module (ECM) triggers this code when it stops receiving proper signals from the crankshaft position sensor (CKP).

The ECM sends a duplicate signal from the crankshaft position sensor to the Fuel Injection Control Module (FICM). When this signal becomes corrupt or intermittent, the system generates the P0374 fault code.

This Harley Davidson trouble code specifically relates to timing reference problems. The crankshaft position sensor helps the ECM determine the exact position of the engine’s crankshaft.

Without accurate timing signals, the engine cannot operate properly. The P0374 error code represents a synchronization failure between these critical engine components.

Symptoms of P0374 Code

Riders experiencing the P0374 Harley fault code typically notice several warning signs. The engine management light illuminates on the dashboard as the primary indicator.

Common symptoms include:

• Engine misfiring during operation
• Difficulty starting the motorcycle
• Rough idle or unstable engine performance
• Reduced fuel economy
• Engine stalling unexpectedly

The motorcycle may run poorly or exhibit decreased performance. Some riders report intermittent issues where symptoms come and go randomly.

In severe cases, the engine may fail to start completely. The bike might start but then stall shortly after beginning operation.

These symptoms occur because the ECM cannot properly time fuel injection and ignition without accurate crankshaft position data.

Common Causes of P0374

Several factors can trigger the P0374 code on Harley motorcycles. The most frequent cause is a faulty crankshaft position sensor that fails to send proper signals to the ECM.

Mechanical issues often contribute to this problem:

• Worn or damaged sensor components
• Buildup of dirt and debris around the sensor
• Loose or corroded electrical connections
• Failed timing components

Environmental factors can also play a role. Oil contamination around the sensor affects its ability to read crankshaft position accurately. Heat and vibration from normal riding can cause sensor degradation over time.

Maintenance-related causes include improper installation after service work. When mechanics remove the crankshaft position sensor during oil changes or other repairs, incorrect reinstallation can trigger the code.

Hope this helps, since you've replaced the sensor twice and it still gives the code, I would start looking on the electrical side as well as internal engine.

 

As Ohio said, I assume you are talking about the Crank Position Sensor.

Were either of those brands the Harley Davidson part #32707-01C....?

If so, check it to make sure it wasn't bad out of the box. It's rare, but it happens.

If you are sure it's good, check the connector for missing or bent pins.

If you are confident you have a good Crank Position Sensor, associated wires, and connectors... then check the front head temp sensor like Ohio suggests...

 

Any "scuff" marks on the old cps?

 

Good question, but...

Let's hope not......

 

WOOT!!!! It is the Engine Temperature Sensor which is located on the back of the left cylinder head. Below is the story.

I replaced the engine temperature sensor like Ohio HD had indicated, from Drag Specialties, but the symptoms still persisted; EXCEPT, I no longer received the diagnostic error code. I rode over 200 miles yesterday and had no problems at highway speeds, but when I would go through a town with stoplights the engine stuttering and sluggishness would start to occur; when I would get back to highway speeds the issue would go away. I took it out today and rode it about 30 miles, with no issues until I got back into town; so this is absolutely a temperature issue; it was so bad I felt like I was limping home. I removed the temperature sensor without letting the engine cool too much, rode it another 5 miles to get it up to operating temp and then rode through town, getting stopped many times by lights, with no issues; not a single blip or hesitation! I would even go far as to say that it ran much better than it has in a long time.

 

UPDATE: I bought a cheap ETS on Amazon to test the one from Drag Specialties with it, meaning the expensive unit I purchased was defective, and my bike runs great now on the Amazon part. So if you have this issue and you want to easily and inexpensively rule out the ETS, purchase the item bellow. I am calling this problem resolved. Thank you, Ohio HD.!

DJF 32446-99 Engine Temperature Sensor Fit for Harley Davidson

 

Many that sucks you went through all that work to find out it was a simple fix. Was the Drag Spec a Harley part? Glad you got it. Thanks for sharing, save someone else a major headache maybe.

 

Glad you got it fixed....

For my part, I always recommend buying the Harley Engine Temp Sensor.

In all my years, all the miles, and on all my various Harley bikes with an ETS... I've never had an OEM engine temp sensor fail.

I'm not being naive. I know they do fail. It's just one of those HD parts I see no reason to buy aftermarket.


For your bike the HD ETS is part #32446-99 @ $44.71. That's cheaper than the Drag Specialties aftermarket brand ETS.

I am willing to bet OEM is better quality than the Amazon aftermarket ETS sensors selling for $12 /$13 dollars.


I am also willing to bet the OEM ETS is better than the DJF #32446-99 ETS you recommend on Amazon for $15.69.

From Amazon reviews:

"Customers have mixed opinions about the engine temperature sensor's fit, with some finding it right while others report issues. Additionally, the quality receives mixed feedback, with one customer describing it as a good quality item while another mentions issues with Chinese machining."