P081C
Park Input Circuit
Transmission / range input
Generic OBD-II
Medium
What it means
P081C means the transmission control module detected a problem with the park input circuit — the switch or sensor signal that confirms the transmission is in Park. Because that signal often feeds the gear-position display and the neutral-safety start circuit, a fault can upset the PRNDL readout and, on some vehicles, prevent the engine from cranking until Park or Neutral is confirmed.
Medium
Can I keep driving? Usually drivable, but on some vehicles the engine may refuse to crank unless the switch confirms Park or Neutral. Get it fixed to avoid a no-start.
Common symptoms
What you'll notice
- Check-engine light on
- No-crank unless the shifter is nudged in Park or Neutral
- Wrong or missing gear-position (PRNDL) display
- Shift-interlock trouble releasing out of Park
Common causes
Most likely first
- Faulty park input switch or sensorLikely
- Damaged, open, shorted, or corroded wiring in the park input circuitCommon
- Corrosion or loose pins in the switch connectorCommon
- Misadjusted park/neutral switchLess often
- Failed transmission control module (TCM)Less often
How to diagnose & fix
Work through it in order
- Scan for codes and read freeze-frame data to confirm the fault.
- Inspect the park input switch wiring and connector for damage, corrosion, or loose pins.
- Test the park signal as the shifter is moved into and out of Park, and check switch adjustment.
- Replace the park input switch/sensor if it doesn't signal correctly.
- If the switch and wiring are good, suspect the range circuit or TCM. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P081C?+
Once running, the car generally drives fine, but because this signal ties into the neutral-safety start circuit you could get a no-crank until it confirms Park or Neutral. Fix it before it leaves you stranded.
Can I just clear P081C?+
It will clear, but returns once the module sees the bad park signal again unless the switch or wiring is repaired.
Related codes
Often seen with P081C
Read & clear P081C yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX