Transmission Park Position Sensor Circuit Open
The P07B8 code indicates an open circuit in the transmission park position sensor or switch circuit. This sensor tells the PCM (Powertrain Control Module) when the transmission is in Park. An open circuit means there is a break in the electrical path, often due to a damaged wire, loose connector, or faulty sensor. This can prevent the engine from starting or cause starting issues, as the PCM may not recognize the Park position.
01. Most Common Causes
- Faulty park/neutral position switch
- Open or shorted wiring in the sensor circuit
- Corroded or loose electrical connector
- Damaged PCM (rare)
02. Symptoms You Will Notice
- Engine will not start or starts only in Neutral
- Check Engine Light illuminated
- Transmission may not shift out of Park
- No crank condition when in Park
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify the code and check for related codes.
Step 2: Inspect the park/neutral position switch connector for corrosion, damage, or loose pins.
Step 3: Test the switch for continuity using a multimeter; replace if open circuit.
Step 4: Check wiring between the switch and PCM for breaks or shorts; repair as needed.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may not start or could unexpectedly shift out of Park, posing a safety risk. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Typically between $50 and $150 for parts and labor, depending on the exact cause and vehicle model.