Open or damaged wiring in the injector 4 control circuit (broken wire, corroded connector); Failed fuel injector 4 (open internal coil); Short to voltage on the injector 4 control circuit; Faulty engine control module (ECM) driver for injector 4; Poor electrical connection at the injector 4 harness connector; Damaged or corroded pins in the ECM connector

DTC codes / Kia codes / P1216

P1216 · KiaFuel Injector 4 Circuit High Voltage

Q: What does code P1216 mean?

Fuel Injector 4 Circuit High Voltage. P1216 on a Kia indicates that the engine control module (ECM) has detected an abnormally high voltage on the control circuit for fuel injector number 4. This typically means the circuit is open, shorted to power, or the injector coil has failed, preventing the ECM from properly energizing the injector.

P1216 on a Kia indicates that the engine control module (ECM) has detected an abnormally high voltage on the control circuit for fuel injector number 4. This typically means the circuit is open, shorted to power, or the injector coil has failed, preventing the ECM from properly energizing the injector.

SystemPowertrain

Code typeKia specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Engine misfire or rough running, especially under load or at idle
Reduced engine power or hesitation during acceleration
Poor fuel economy due to incomplete combustion
Possible shaking or vibration from the engine bay

Common causes, most likely first

Open or damaged wiring in the injector 4 control circuit (broken wire, corroded connector)
Failed fuel injector 4 (open internal coil)
Short to voltage on the injector 4 control circuit
Faulty engine control module (ECM) driver for injector 4
Poor electrical connection at the injector 4 harness connector
Damaged or corroded pins in the ECM connector

How to diagnose and fix it

Perform a visual inspection of the injector 4 wiring and connector for damage or corrosion
Check for technical service bulletins (TSBs) related to P1216 for your specific Kia model
Measure the resistance of fuel injector 4 and compare to specification
Test the injector 4 control circuit for continuity and short to voltage
Swap injector 4 with a known-good injector (e.g., from another cylinder) to see if the code moves
Inspect the ECM connector and pins for damage or corrosion
If all else checks out, diagnose or replace the ECM as a last resort

Before you replace the fuel injector

A high voltage code often results from an open circuit rather than a shorted injector, so check wiring continuity before condemning the injector.
Corrosion at the injector connector is a common cause on older Kia models, especially in areas with road salt exposure.
Swapping the injector with another cylinder is a quick way to verify if the fault follows the injector or stays with the circuit.
The ECM driver for the injector can fail, but this is rare; ensure all other possibilities are ruled out first.
A loose or damaged ground connection for the engine can cause erratic injector operation and set false high voltage codes.

Can I keep driving with P1216?

Driving with P1216 is possible but not recommended because a misfiring cylinder can damage the catalytic converter over time. Avoid heavy acceleration and have the vehicle inspected promptly.

Tools that help

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