P1538 OBD Code Definition:
P1538 Intake Manifold Runner Control Stuck Open
P1538 OBD Code Description:

Possible Causes

• Fuel Shutoff Solenoid  Faulty
• Wiring to / from Fuel Shutoff Solenoid  Faulty
• Engine Control Module Faulty

Possible Solutions

• Check Fuel Shutoff Solenoid using Output Tests
• Check wiring to/from Fuel Shutoff Solenoid