What does code P1555 mean?

Q: What does code P1555 mean?

Electronic Variable Orifice Output. P1555 on GM vehicles indicates that the powertrain control module (PCM) has detected an electrical fault in the output circuit for the electronic variable orifice (EVO) solenoid, which is part of the power steering system. The PCM monitors the EVO actuator's command and feedback circuits and sets this code when the measured current or voltage falls outside the expected range for the commanded duty cycle.

DTC codes / GM codes / P1555

P1555 · GMElectronic Variable Orifice Output

P1555 on GM vehicles indicates that the powertrain control module (PCM) has detected an electrical fault in the output circuit for the electronic variable orifice (EVO) solenoid, which is part of the power steering system. The PCM monitors the EVO actuator's command and feedback circuits and sets this code when the measured current or voltage falls outside the expected range for the commanded duty cycle.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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