Embraer Jet Undifferentiated or Other Model
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Workload; Situational Awareness
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Wake Vortex Encounter
Environment - Non Weather Related; Human Factors; Procedure
While on the arrival into IAH we were descending through 10;000 feet and started making a turn. Autopilot was on vertical speed and LNAV. We then went through some unexpected wake turbulence. Lateral mode then kicked off; due to the turbulence; vertical mode was still on though causing us to overfly the turn. I hit NAV mode again and it recaptured but it was using a shallow bank (less than 15 degrees). The Captain then suggested steepening the bank. I then used TCS mode and steepened the bank to get back on course. At this point ATC gave us a heading and we explained what had happened to them. Some threats that were involved include high work load; we were slowing down turning and coming through 10;000 feet. It was fairly smooth; so we were not expecting any wake or turbulence. After lateral mode turned off we fixed the problem as quickly as possible. Some things I learned is that we could have informed ATC after the turbulence happened.
EMB First Officer reported a track deviation occurred on arrival into IAH when a wake encounter caused an autopilot lateral mode trip off.