P081C - Park Input Circuit Malfunction
The P081C code indicates a problem in the park input circuit, which is part of the transmission range sensor or park/neutral position switch. This circuit tells the PCM when the transmission is in Park. A fault can prevent the engine from starting or cause incorrect gear indication.
01. Most Common Causes
- Faulty park/neutral position switch
- Open or short in the park input circuit wiring
- Corroded or loose connector at the switch
- Failed PCM (rare)
02. Symptoms You Will Notice
- Engine may not start in Park or Neutral
- Incorrect gear position display on dashboard
- Transmission may not shift properly
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect the park/neutral position switch and its wiring for damage or corrosion.
Step 3: Test the switch continuity with a multimeter; replace if faulty.
Step 4: Check for open or short circuits in the wiring harness and repair as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended because the vehicle may not start or could shift unexpectedly, posing a safety risk.
How much does it cost to fix?▼
Typically between $50 and $150 for parts and labor, depending on the cause and vehicle model.