Faulty or misadjusted transmission range sensor or park/neutral switch; Selector linkage or cable out of adjustment, worn or loose; Damaged wiring, corroded terminals or poor connector contact in the Park input circuit; Fault in the gear selector assembly or its internal switch contacts; Low or unstable supply voltage, or poor earth to the sensor or control unit; Internal fault in the transmission or powertrain control module.

P081C

Park Input Circuit.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
8: AreaTransmission
1C: FaultThe specific fault in that area

What it means

P081C is the generic code for a fault in the Park input circuit. The powertrain control module or transmission control module monitors the signal that tells it the gear selector is in Park. It sets the code when that signal is missing, stuck, out of range or does not agree with the other selector or transmission range inputs.

Symptoms

Engine will not crank or start in Park, or only starts in Neutral
Engine starts in Drive or Reverse when it should not
Gear selector position shown wrongly on the dashboard
Reverse lights not working or staying on
Harsh, delayed or missing gear engagement
Gearbox warning light or malfunction indicator lamp on

Possible causes

Faulty or misadjusted transmission range sensor or park/neutral switchlikely
Selector linkage or cable out of adjustment, worn or looselikely
Damaged wiring, corroded terminals or poor connector contact in the Park input circuitlikely
Fault in the gear selector assembly or its internal switch contactspossible
Low or unstable supply voltage, or poor earth to the sensor or control unitpossible
Internal fault in the transmission or powertrain control modulerare

How to diagnose

Read all stored and pending codes and note the freeze frame data, including gear position and vehicle speed when the code set
Check for other codes, especially related to range sensor, starter or battery voltage, and fix those first
Check the live data for selector position while moving the lever through each gear and confirm Park is reported correctly
Inspect the selector linkage or cable for looseness, damage and correct adjustment against the manufacturer's procedure
Inspect the range sensor or switch wiring and connectors for water ingress, corrosion, chafing and pushed-out pins
Test the circuit for supply, signal and earth, and check for open or short circuits with the connector unplugged
Check battery condition and charging voltage, as low voltage can upset switch signals
Test the sensor or switch output against the specification for your model, as the circuit layout varies by make and transmission

How to fix

Adjust the selector linkage or cable and the range sensor to the manufacturer's specification
Replace the faulty transmission range sensor or park/neutral switch
Repair or replace damaged wiring and clean or replace corroded connectors
Replace the gear selector assembly if its internal contacts are worn or faulty
Repair battery, supply or earth faults found during testing
Replace or repair the control module only after all wiring and sensor faults have been ruled out

Can I keep driving?

Medium severity

The car may still be drivable, but it could fail to start or could start in gear, so get it fixed soon. If it will not hold a gear properly, behaves unpredictably or the selector position is unreliable, avoid driving it.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.