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DTC codes / Kia codes / P1215

P1215 · KiaFuel Injector 3 Circuit High Voltage

P1215 on a Kia indicates that the engine control module (ECM) has detected an abnormally high voltage on the control circuit for fuel injector number 3. This means the ECM is commanding the injector to open, but the circuit is showing voltage that is higher than expected, which can prevent the injector from firing and cause a misfire or rough running.

SystemPowertrain
Code typeKia specific
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Check engine light illuminated, often with no other noticeable symptoms
  • Rough idle or shaking, especially when the engine is cold
  • Engine misfire, particularly noticeable during acceleration or under load
  • Reduced engine power or hesitation during acceleration
  • Poor fuel economy due to incomplete combustion in cylinder 3
  • In some cases, the engine may enter limp mode to protect the catalytic converter

Common causes, most likely first

  1. Faulty fuel injector 3 (internal short or open coil)
  2. Damaged or chafed wiring harness between the ECM and injector 3
  3. Corroded or loose electrical connector at injector 3
  4. Short to voltage in the injector control circuit
  5. Failed engine control module (ECM) driver for injector 3
  6. Aftermarket or incorrect injector installed previously

How to diagnose and fix it

  1. Perform a visual inspection of the injector 3 connector and wiring for damage or corrosion
  2. Use a multimeter to check the resistance of injector 3 and compare to the manufacturer's specification
  3. Check for voltage on the injector control circuit with the key on and engine off; compare to expected values
  4. Inspect the wiring harness for shorts to voltage or grounds, especially near hot or moving components
  5. Swap injector 3 with a known-good injector from another cylinder to see if the code follows the injector
  6. Test the ECM driver circuit with an oscilloscope or noid light to confirm proper pulsing
  7. If all else checks out, reprogram or replace the ECM as a last resort

Don't overlook the injector connector

  • A loose or corroded connector at injector 3 is a common cause that is often missed because it can intermittently set the code without permanent failure.
  • The code can be set by a short to voltage in the wiring harness, which may only occur when the engine is warm or vibrating, so a wiggle test is essential.
  • A failed ECM is rare but possible; always rule out wiring and injector issues before condemning the computer.
  • This code is specific to the injector control circuit, not the fuel delivery system, so fuel pressure problems will not set P1215.
  • After replacing an injector, always clear the adaptive learning values and perform a relearn procedure if required by the manufacturer.

Can I keep driving with P1215?

You can drive the vehicle short distances to a repair shop, but avoid heavy acceleration or sustained high speeds because the misfire can damage the catalytic converter. If the engine is running very rough or flashing the check engine light, stop driving and have it towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Kia vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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