Faulty EGR boost sensor solenoid (internal coil failure or sticking); Damaged or disconnected electrical connector at the solenoid; Wiring harness damage (open, short to ground, or short to power) between the PCM and solenoid; Corroded or loose terminals in the solenoid circuit; Failed PCM driver for the solenoid control circuit (rare)

DTC codes / Kia codes / P1487

P1487 · KiaEGR Boost Sensor Solenoid Circuit Fault

Q: What does code P1487 mean?

EGR Boost Sensor Solenoid Circuit Fault. P1487 on Kia vehicles indicates that the powertrain control module (PCM) has detected an electrical fault in the circuit for the EGR boost sensor solenoid, which is a solenoid valve that helps regulate the signal from the boost sensor to the exhaust gas recirculation (EGR) system. The PCM monitors the solenoid's control circuit for expected voltage or current patterns and sets this code when the signal is out of range, indicating an open, short, or component failure.

P1487 on Kia vehicles indicates that the powertrain control module (PCM) has detected an electrical fault in the circuit for the EGR boost sensor solenoid, which is a solenoid valve that helps regulate the signal from the boost sensor to the exhaust gas recirculation (EGR) system. The PCM monitors the solenoid's control circuit for expected voltage or current patterns and sets this code when the signal is out of range, indicating an open, short, or component failure.

SystemPowertrain

Code typeKia specific

SeverityMedium

Fix difficultyIntermediate

AreaAuxiliary emission controls

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or stumbling during acceleration due to improper EGR modulation
Reduced engine performance or hesitation when accelerating
Increased exhaust emissions, potentially failing an emissions test
Occasional surging or erratic engine behavior under light throttle

Common causes, most likely first

Faulty EGR boost sensor solenoid (internal coil failure or sticking)
Damaged or disconnected electrical connector at the solenoid
Wiring harness damage (open, short to ground, or short to power) between the PCM and solenoid
Corroded or loose terminals in the solenoid circuit
Failed PCM driver for the solenoid control circuit (rare)

How to diagnose and fix it

Inspect the solenoid electrical connector for corrosion, tightness, and secure engagement
Check the solenoid resistance with a multimeter and compare to Kia specifications
Test the solenoid control circuit for continuity and shorts using a wiring diagram
Verify power and ground signals at the solenoid connector with the key on
Replace the EGR boost sensor solenoid if electrical tests indicate a faulty component
Repair or replace damaged wiring harness sections as needed
Clear the code and perform a drive cycle to confirm the repair

Don't overlook the boost sensor solenoid

A stuck-open EGR valve can mimic solenoid circuit faults, so verify valve operation before replacing the solenoid.
The boost sensor solenoid is often misdiagnosed as a faulty boost sensor itself, but the solenoid controls a vacuum signal and rarely affects sensor output directly.
Kia models with this code sometimes have a solenoid that tests fine electrically but fails under heat, so a cold resistance check may miss the fault.
Corrosion inside the solenoid connector pins is a common cause that visual inspection alone may not reveal; a load test on the circuit is more reliable.
This code can be set by a momentary voltage spike from a failing alternator or poor ground, so check charging system health if the solenoid tests good.

Can I keep driving with P1487?

You can generally continue driving with P1487, but avoid aggressive acceleration and long trips until repaired, as the fault may cause poor emissions and reduced fuel economy. If the check engine light flashes or you notice severe performance loss, stop driving and seek service.

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.