What Does P0635 Mean? The Engine Control Module (ECM) monitors the Power Steering Control Circuit. The ECM sets the OBDII code when the Power Steering Control Circuit is not factory specifications. engine code P0635P0635 fixobd P0635dtc P0635obd code P0635obd2 P0635P0635 car codediagnostic code P0635car code P0635check engine code P0635fehlercode P0635P0635 fiatcodigo P0635codigo falla P0635P0635 kody b??dówcodigo de falla P0635 What are the common causes of P0635 ? A large air leak at or near the number one oxygen sensor would also cause a lean mixture. Faulty IMRC actuator relay (if equipped) A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture. How do you troubleshoot P0635 ? If one of the steering switches has been identified as damaged or faulty, it should be replaced as needed. Any faulty, corroded, damaged or broken wiring related to the steering system should be fixed as well. If any of the control modules have been identified as problematic, a memory saver should be attached to the system in order to save the info from being potentially wiped. If all of the pertinent components and wiring have been verified or repaired, you should scan it again with an OBD-II scanner to see if the computer still reads the P0635 code. Give the vehicle a test drive following your repairs to see if the code returns. Searches related to P0635 - Power Steering Control Circuit arctic cat error codes p0365