P1297Manufacturer-specific code

P1297 Code: Electrical Load Detector (ELD) Circuit Low Voltage (Honda)

On Honda and Acura, the P1297 code means the electrical load detector (ELD) circuit shows low voltage. The idle may dip when you turn on the lights or the A/C. A failed ELD or a short in its signal wire is the usual cause.

Severity
Low
Can I keep driving?
Yes, no immediate risk
Estimated cost
$40 to $300
Difficulty
Medium
System
Computer and Outputs
Applies to
Depends on the manufacturer

Common in: Honda

Updated Reviewed by Renzo Chacca

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What the P1297 code means

P1297 is a manufacturer-specific code: the 1 in the second position means each automaker defines what it stands for, not the generic standard. The most widespread definition is the one used by Honda and Acura. If your vehicle is another brand, confirm the code text with a scan tool that supports that manufacturer.

ManufacturerMeaning of P1297
Honda and AcuraElectrical load detector (ELD) circuit low voltage

The electrical load detector (ELD) measures how much current the electrical system draws. The computer uses it to control alternator charging and to compensate the idle when loads are switched on.

The computer sets the P1297 code when the ELD signal is too low.

Before you repair anything, confirm the make, model, year and engine. With manufacturer codes, the same number can change even between engines from the same brand.

P1297 code symptoms

  • Check engine light on.
  • Idle that dips when you turn on the lights or the A/C.
  • Uneven battery charging.

Likely causes of the P1297 code

  1. Failed ELD in the engine compartment fuse box.
  2. Signal wire shorted to ground. Look for rubbing against the engine, the chassis or the exhaust.
  3. Moisture in the fuse box. Confirm it with the tests in the diagnosis section.

How to diagnose the P1297 code step by step

  1. Measure the ELD signal. It should change when you turn on electrical loads.
  2. Inspect the engine compartment fuse box for moisture or corrosion.
  3. Check the wiring.

How to fix the P1297 code

  • Replace the ELD or the fuse box that includes it.
  • Repair the wiring, then clear the P1297 code and confirm it does not return.

Technical reference data

  • The ELD signal drops as the electrical load goes up.
  • P1xxx codes are manufacturer-specific: confirm the definition with a scan tool that supports your brand.
  • Values are approximate: check the manufacturer data for your vehicle.

Brand-specific notes

Very common on the Civic, Accord, CR-V, Fit and Odyssey.

If your vehicle is another brand, check the table above for the meaning its manufacturer gives the code, and confirm it with a scan tool that supports that brand.

Frequently asked questions about P1297

What does the P1297 code mean on a Honda?
It means the electrical load detector (ELD) circuit shows low voltage. The idle may dip when you turn on the lights or the A/C.
Does P1297 mean the same thing on every brand?
No. It is a manufacturer code, and on other brands it may not exist or it may mean something else.
Can I drive with a P1297 code?
Yes. The severity is low. Keep an eye on the battery, since the alternator may not charge as it should.
How much does it cost to fix P1297?
On a Honda the cost runs from about $40 to $300. A wiring repair is on the low end, while a new ELD or fuse box costs more.
Will a P1297 code clear itself?
Unlikely. A failed detector or a shorted wire does not repair itself, though moisture in the fuse box can make the fault come and go.
What is the most common cause of P1297?
A failed ELD in the engine compartment fuse box. Check that box for moisture and the signal wire for a short to ground.

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Questions about the P1297 code

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