M20 pilot reported loss of directional control on landing that resulted in a runway excursion.

Narrative:

I preflighted and found no conditions abnormal. I departed on [a] VFR flight. Landing was normal until when the nose wheel touched down. The aircraft veered to the left and I was unable to arrest the left turn by right rudder pedal movements. Winds were slightly from the left and under 10kts. The aircraft departed the runway and went into the grass. I had noticed that the electric rudder trim was left of center and selected it right of center. As the aircraft slowed I was able to steer the aircraft right and taxi back on runway. I taxied to ramp and got out and inspected aircraft. I noticed that the tug turning radius stop to the left had been bent. I consulted with a mechanic about the situation. I had an airport employee get in plane and move rudder pedals while I watched the nose gear move left and right normally. I preflighted the aircraft and checked for any damage on aircraft and found none. I performed several high speed taxi runs on runway to determine if there were any steering or handling issues which there were none. Before departing I determined as pilot in command that the aircraft was airworthy and safe for flight. I returned with gear down and locked. The landing was normal with no steering problems.corrective action. During preflight-check for turning limit stop for any issues. Land with rudder trim centered. Be aware always for unusual things to happen while landing.

Original NASA ASRS Text

Title: M20 pilot reported loss of directional control on landing that resulted in a runway excursion.

Narrative: I preflighted and found no conditions abnormal. I departed on [a] VFR flight. Landing was normal until when the nose wheel touched down. The aircraft veered to the left and I was unable to arrest the left turn by right rudder pedal movements. Winds were slightly from the left and under 10kts. The aircraft departed the runway and went into the grass. I had noticed that the electric rudder trim was left of center and selected it right of center. As the aircraft slowed I was able to steer the aircraft right and taxi back on runway. I taxied to ramp and got out and inspected aircraft. I noticed that the tug turning radius stop to the left had been bent. I consulted with a mechanic about the situation. I had an airport employee get in plane and move rudder pedals while I watched the nose gear move left and right normally. I preflighted the aircraft and checked for any damage on aircraft and found none. I performed several high speed taxi runs on runway to determine if there were any steering or handling issues which there were none. Before departing I determined as Pilot in Command that the aircraft was airworthy and safe for flight. I returned with gear down and locked. The landing was normal with no steering problems.Corrective action. During preflight-check for turning limit stop for any issues. Land with rudder trim centered. Be aware always for unusual things to happen while landing.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1520485
Time
Date	201802
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	M-20 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	None
Component
Aircraft Component	Nosewheel Steering
Person 1
Function	Single Pilot Pilot Flying
Qualification	Flight Crew Private Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 50 Flight Crew Total 3000 Flight Crew Type 1500
Events
Anomaly	Aircraft Equipment Problem Less Severe Ground Event / Encounter Loss Of Aircraft Control Ground Excursion Runway