When it comes to Harley bikes, there’s a lot to understand, particularly when it comes to error codes. This article offers an in-depth look at Harley Code P1510, common among Harley Davidson bikes, especially those with handlebar alterations. On top of that, we’ll talk about when you should be concerned, what you should know, and what you can do about the code without making a trip to your local dealer. Ready? Let’s move.

What Does Harley Code P1510 Mean?

Code P1510 is a diagnostic trouble code (DTC) signifying a throttle actuator control issue. It’s often linked to the throttle-by-wire (TBW) system, a technology that replaces the mechanical linkage between the throttle and the engine with electronic signals.

Here’s a break down of all of the codes (including this one) in one place:
– Unlock the Power of Harley Diagnostic Codes (PDF Included) (theseasonedwrench.com)

What Can Cause This Code?

Several factors can trigger the P1510 code:

1. Twist Grip Sensor (TGS) issues: The TGS acts like a throttle position sensor, transmitting throttle grip position to the Electronic Control Module (ECM). A malfunctioning TGS could trigger a P1510 code.
2. Wiring problems: Broken wires or loose connections in the throttle control circuit could cause this code.
3. ECM issues: Though rare, a faulty ECM could trigger the P1510 code.

Should You Be Concerned?

Yes, the onset of a P1510 code signifies that the bike’s throttle control system is not functioning as expected. This could lead to unpredictable throttle responses, a serious safety concern.

How to Troubleshoot Code P1510

1. Sensor Reset:
   • Perform a sensor reset as a first step. This process can recalibrate the throttle position sensor without needing to access or dismantle any bike parts.
2. Continuity Checks:
   • Use a multimeter to check the continuity of the wiring harness from the TGS to the ECM and throttle body. Look for any breaks or shorts that could be causing the P1510 code.
3. Inspect and Repair Wiring:
   • Inspect the wiring for any signs of wear, especially in areas where the harness bends or stretches during handlebar turns. A break may not always be visible, so feeling the wires for inconsistencies can be crucial.
4. Throttle Grip Sensor (TGS) Examination:
   • Carefully examine the TGS for any signs of damage or improper installation. Ensure it’s correctly aligned and seated within the new handlebars.

The Harley trouble codes you should be familiar with:
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> Harley Code B2141 Gets Completely Explained
> The U0141H Harley Code Gets Completely Explained

What Does The Community Say?

Riders have shared their experiences with code P1510, particularly after handlebar changes. A common thread in the discussions is the delicate nature of the TBW system, which can be easily damaged during handlebar alterations.

Example #1

A rider from the Harley Davidson Forums encountered the P1510 code after installing 13-inch ape hangers on a 2009 Street Glide. The throttle became sluggish, and power felt reduced. A suggested fix was a sensor reset procedure, which involves a specific ignition sequence without touching the throttle grip, potentially resolving the issue without dismantling the handlebars.

Example #2

Another case involved a 2012 Street Glide throwing P1510 along with P2127 and P2138 codes. Initially suspected to be a Twist Grip Sensor (TGS) failure, the real culprit was a broken wire in the harness near the steering neck, discovered after thorough continuity checks. Repairing the wire resolved the codes, highlighting the importance of checking the wiring harness for hidden issues.

Example #3

A discussion on CVOHarley focused on a 2011 model experiencing P1510 and P2138 after a handlebar swap. Despite the bike running fine, these codes indicated a correlation error between the throttle position and the TGS. The issue persisted even after ensuring no wires were crossed and the grip sensor was handled delicately, suggesting a deeper problem possibly related to the sensor or its calibration.

Are Any Repairs Necessary To Fix The Code?

Depending on the cause of the P1510 code, different repair strategies are recommended:

1. For TGS issues: Replace the TGS unit. A new unit costs around $90-$150.
2. For wiring problems: Check the continuity of the wiring harnesses using a wiring diagram. Repair any broken or loose connections.
3. For ECM issues: This is a rare cause, but if the ECM is at fault, it may require replacement.

How Can You Clear The Code?

Before clearing the code, ensure to fix the underlying issue. Once resolved, use an OBD-II scanner to clear the code. Some riders also suggest a manual sensor reset procedure, involving a specific ignition sequence.

How Common Is Code P1510?

Code P1510 seems to be fairly common, especially in bikes with altered handlebars. The TBW system’s sensitivity makes it prone to damage during handlebar modifications, leading to the P1510 code.

This deep dive into Harley Code P1510 underscores the importance of a delicate touch when altering handlebars on a Harley Davidson bike. By understanding this code, you can ensure your bike’s throttle system remains in top shape.

Remember, when working on your bike, take care to protect sensitive components. If you’re not confident in your skills, consult a professional mechanic. Happy riding! – and don’t forget to keep these technical resources with you:

> Torque Specs for Harley Davidson: Ultimate Guide (PDF)
> Complete Harley Davidson Tire Size Chart (PDF)

Frequently Asked Questions