Honda eld voltage high

Honda eld voltage high DEFAULT
Trouble CodeFault LocationProbable Cause
P1298Electric Load Detector Circuit High Voltage (Honda)
IDM Failure (Ford)
Air/Fuel Ratio Lean Under Wide Open Throttle Condition (Chrysler, Dodge)

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What Does Code P1298 Mean?

If your Honda vehicle has stored a code P1298, it means that the powertrain control module (PCM) has detected a problem with part of the charging system known as the electronic load detector (ELD) or ELD circuit. This code specifically pertains to a condition in which a voltage signal that is higher than anticipated has been perceived. In my experience, only Honda vehicles utilize this type of ELD device or code P1298.





The ELD is a small current transformer that is located in the underhood fuse and relay box. It could be easily confused with some type of fuse but it actually detects the degree of voltage (current) which is being pulled from the battery and charging system. The PCM regulates the amount of voltage applied to the alternator field coil in accordance with the signal received from the ELD. This allows the voltage output of the alternator to fluctuate in order to meet varying load requirements.

When factory accessories are in use (especially lighting and air conditioning), alternator output must be near the maximum level of 14.4-volts. When these accessories are not in use, alternator output needs to drop to near minimum (usually 12.1-volts) in order to conserve fuel and maximize alternator longevity. After all, if the alternator is producing maximum output constantly, it is not going to last for very long and it will place an increased load on the engine.

If the PCM detects a voltage signal from the ELD circuit that is greater than the degree of voltage it expected the alternator to produce at a given time and under a specific set of circumstances, a code P1298 will be stored and a malfunction indicator lamp (MIL) may be illuminated.

What are the common causes of code P1298?

  • Defective ELD
  • Bad PCM or a PCM programming error
  • Alternator is overcharging due to a faulty internal regulator

What are the symptoms of code P1298?

  • Swollen, leaking, or discharged battery
  • Unusually bright lighting
  • Abnormal noise from the alternator
  • Repeated alternator and/or battery failure

How do you troubleshoot code P1298?

I try to have a diagnostic scanner, a digital volt/ohmmeter, and a reliable vehicle information source like All Data (DIY) on hand when diagnosing a code P1298.

It is very likely that the symptoms which the vehicle in question is exhibiting, as well as the stored code P1298, are the subject of a factory technical service bulletin (TSB). The ELD used in Honda vehicles has demonstrated a proclivity for failure. Use your vehicle information source to search the TSB index for one that matches the vehicle in question, as well as the symptoms and code presented. The information contained therein may prove helpful in your diagnosis.

Carefully inspect the alternator and battery as well as all wiring and connectors associated with the starting/charging system. Repair or replace any corroded or damaged components before proceeding with your diagnosis.

Connect the scanner to the vehicle diagnostic connector and retrieve stored codes and freeze frame data. Write it down as it will almost always come in handy if the diagnosis drags on due to an intermittent condition. Clear the codes and operate the vehicle under various electrical load conditions to see if the code P1298 is reset.

Observe the data display on the scanner while using the DVOM to test live voltage data at the alternator. If the voltage output signal displayed on the scanner is higher than what is reflected by the voltage display on the DVOM, suspect a defective ELD. In some cases, replacement of the ELD will require removal of the entire fuse box. Consult your vehicle information source to obtain the correct ELD replacement procedure for the vehicle in question.




If ELD voltage displayed on the scanner matches what is displayed on the DVOM, suspect a defective PCM or a PCM programming error.

Alternator failure will rarely result in a high voltage condition at the ELD but follow the guidelines set forth in the vehicle information source and corresponding TSB/s for diagnosing and repairing charging system malfunctions for the specific vehicle in question.

Codes Related to P1298

  • P1297 Electric Load Detector (ELD) Circuit Low Voltage
  • P1449 Battery Cell Overheating
  • P1568 Battery Module Individual Voltage Input Problem
  • P1580 Battery Current Circuit Problem

Other Manufacturer Specific Definitions for P1298

Injector control module -internal fault (Ford)
Electrical load control module - voltage high (Acura)
System too lean -at prolonged wide open throttle (Chrysler)
System too lean -at prolonged wide open throttle (Dodge)
Electrical load detector – circuit high voltage (Honda)
Electrical load sensor - circuit/voltage high (Isuzu)
System too lean -at prolonged wide open throttle (Jeep)
System too lean -at prolonged wide open throttle (Plymouth)

BAT Team Discussions for P1298

  • Civic 2002 Power Loss P1298
    2002 Honda Civic 38k miles and I don't drive it too hard. Maintenance has been kept up with. Sparkplugs are new last summer, injector cleaner added to fuel as well as the water remover Heet. . Since the winter time I have had a problem with engine power when driving after the car has been idle for s...

P1298 ELD circuit voltage high

Fix P1298 ELD circuit voltage high on Honda

Honda vehicles are equipped with an electric load detector (ELD) Honda ELD, 38255-S5A-003that measures the load on the charging system and can set a P1298 ELD circuit voltage high when there’s a problem. The ELD sends a signal to the ECM which controls the voltage regulator and adjusts field coil voltage to match the load. The ELD reduces field coil voltage during low load periods to increase fuel economy.

On May 6, 2005 Honda issued a service bulletin #05-006 to address the issue a P1298 ELD circuit voltage high trouble code. The service bulletin advises that Honda has discovered a faulty solder joint on the ELD and recommends replacement with an updated part #38255-S5A-003, H/C 7987571.

Before you replace the part, conduct the following P1298 ELD circuit high voltage tests:

1) Reset the ECM. Then start the engine and turn on the headlights. If the ELD circuit high voltage does not set, the problem is intermittent.

2) To test the ELD, disconnect the electrical connector. Then check for continuity between terminal #1 and ground. If no continuity, there’s an open between the ELD and ground.

3) Next, check for continuity between terminal #3 and ECM terminal D16. If no continuity, check for open in that wire.

4) Start engine and allow it to idle. Check voltage between ECM terminals A9 and D16. Then turn on headlights. If the voltage does NOT drop, replace the ELD. If voltage does drop, the problem is in the ECM.

The P1298 ELD circuit high voltage exits in these vehicles:

P1298 ELD circuit voltage high Honda Civic
P1298 ELD circuit voltage high Honda Acura
P1298 ELD circuit voltage high Honda CRV
P1298 ELD circuit voltage high Acura RSX


©, 2015 Rick Muscoplat

Posted on by Rick Muscoplat

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P1298 HONDA Code - Electric Load Detector Circuit High Voltage

Engine-Codes - Honda - P1298 HONDA

Repair Importance Level: 3/3

Repair Difficulty Level: 2/3  What is this?

What does this mean?

|P1298 HONDA code possible causes

  • Faulty Electronic Load Detector Unit
  • Faulty Engine Control Module (ECM)
  • Electronic Load Detector Unit harness is open or shorted
  • Electronic Load Detector Unit circuit poor electrical connection

|How is the P1298 HONDA code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|What is the cost to diagnose the P1298 HONDA code

Labor: 1.0

The cost to diagnose the P1298 HONDA code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P1298 HONDA code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|What is P1298 HONDA code meaning?

The Electric Load Detector (ELD) measures the main current flow and sends that signal to the Engine Control Module (ECM) to command the alternator charging system to get fuel efficiency and decrease the drag of the engine when starting.

|Need more information with the P1298 HONDA code?

Need more information on how to fix the P1298 HONDA code?
Get Access to Factory Service Manuals

|P1298 HONDA code information for specific Honda models

Repair Importance Level:3


1=Low 2=Medium 3=High What is this?

Repair Difficulty Level:2


1=Easy 2=Moderate 3=Hard What is this?

Browse Codes for Specific Model-Year

2003 Honda CRV P1298 - Electronic Load Detector (ELD) Replacement

Error Code P1298: Electric Load Detector Circuit High Voltage

Error Code P1298 is defined as Electric Load Detector Circuit High Voltage. This means the ELD (Electric Load Detector) is getting high input voltage.

This error code is a manufacturer-specific trouble code, meaning it does not appear to all vehicle makes and models with OBD-II system or vehicles made since 1996 up to present. Rather, it applies to select vehicle manufacturers, most commonly among Honda vehicles like Honda Accord, Honda Civic, and Honda CR-V. Other manufacturers with the same error code may have different specifications on the definition, troubleshooting, and repairs for this code.


The Electric Load Detector works by monitoring the amount of current that the charging system is using, so it can determine how much voltage needed to charge the battery. If the voltage input is too high, it signals the PCM that something is not right with the ELD, activating the Check Engine light and registering the code in the process.

Common Symptoms

As with other error codes, this code sets the Check Engine light and registers the error code. Usually, there are no other noticeable symptoms. In some cases, however, the engine may suffer rough idle, especially when the vehicle settles down or transitions from high throttle to rest, or the engine feels like it’s misfiring.

Possible Causes

There are multiple reasons for this code to appear, some of the most common causes include:

  • Faulty Electric Load Detector
  • Faulty PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes)
  • Open or shorted Electric Load Detector Harness
  • Poor electrical connection in Electric Load Detector Circuit

How to Check

The first thing you can do to diagnose this problem is to reset the PCM. Pull the number 6 fuse for 10 seconds and then put it back in. Then, start the engine and turn on the headlights, check for the same code. If the code is not thee, that means you have an intermittent failure. Next, check the connections at the ELD.

If the code comes back, turn the off both the headlights and the ignition. Disconnect the ELD 3P connector, which is located behind or underneath the under hood fuse box.

Next, turn on the ignition and measure the voltage between the ground and the ELD 3P connector through the terminal no. 1. It’s the black/orange wire. Backprobe that on the harness connector.

If there is no battery voltage, then check the no. 4 fuse. If the fuse is ok, repair the open in the wire between no. 4 fuse and ELD.

If there is a battery voltage, turn off the ignition and then connect the ELD 3P connector terminal no. 3 to the body ground with a jumper wire. No. 3 terminal is the green/red wire. Again, back probe that with a pine and connect the jumper wire the pin.

Next, disconnect the PCM connector E (31P) and then check for continuity between body ground and the PCM connector terminal E15. It’s the green/red wire at terminal 15.

If you don’t see continuity, then repair open wires between the ELD and the ECM E15.

If there is continuity, check for continuity between the ELD 3P connector terminal no. 2 and body ground. It’s the black wire.

If there is no continuity, repair open wires between the G201 which is ground connection and the ELD.

If there is continuity, reconnect the ELD connector as well as the PCM. Start the engine and allow it to idle.

As you measure the voltage between the PCM connector terminals A24 (brown/yellow wire) and E15 (green/red wire), make sure you turn the headlights on high. Check whether the voltage drops.

If the voltage does not drop, replace the ELD

If the voltage drops, then you need to update the PCM or replace it.

How to Fix

This error code is easy to repair, but of course, you need a thorough diagnosis as enumerated above. Some of the most common fixes are:

  • Replacement of the Electric Load Detector
  • Update or replacement of the PCM
  • Repair open wires
  • Repair or replace Open or shorted Electric Load Detector records
  • Repair poor electrical connection in Electric Load Detector Circuit

For Honda vehicles, there is a factory service bulletin for Honda models such as 2001–2005 Honda Civic, 2002–2004 Honda CR-V 2001-2005, and Honda Civic 2002-2004.


Voltage honda high eld


Honda P1298 Electric Load Detection Circuit \


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