Transmission Park Position Sensor Circuit Open
The P07B2 code indicates an open circuit in the transmission park position sensor/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, preventing the sensor from sending the correct signal. This can cause starting issues, as the vehicle may not recognize it is in Park, and can affect shift lock and other transmission functions.
01. Most Common Causes
- Faulty park/neutral position switch
- Open or shorted wiring in the sensor circuit
- Corroded or damaged connector
- Blown fuse related to the transmission control system
02. Symptoms You Will Notice
- Engine may not start or only starts in Neutral
- Check Engine Light illuminated
- Transmission may not shift out of Park
- Shift lock malfunction
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 and its wiring for damage, corrosion, or loose connections.
Step 3: Test the switch with a multimeter for continuity in Park and Neutral positions.
Step 4: Check the fuse for the transmission control module and replace if blown.
Step 5: If wiring and switch are okay, test the circuit back to the PCM for open or short.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not recommended. 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.