Transmission Park Position Sensor Circuit Open
The P07B2 code indicates that the transmission park position sensor or its circuit has an open condition. This sensor tells the PCM (Powertrain Control Module) when the transmission is in Park, which is critical for starting the engine and engaging the park lock. An open circuit means there is a break in the electrical path, preventing the sensor signal from reaching the PCM. This can be caused by a faulty sensor, damaged wiring, or a poor connection. The vehicle may not start or may have issues with the shift interlock system.
1. Symptoms You Will Notice
- Engine may not start or only starts in Neutral
- Transmission shift interlock malfunction
- Check Engine Light illuminated
- Vehicle may not recognize Park position
2. Most Common Causes
- Faulty or defective park/neutral position switch or sensor
- Open or broken wiring in the sensor circuit
- Corroded, damaged, or bent pins in the sensor electrical connector
- Blown transmission circuit fuse
- Poor ground connection in the sensor circuit
- Internal failure of the transmission control module (TCM/PCM)
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the park position sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor's resistance and voltage according to manufacturer specifications.
Step 4: Check for continuity in the circuit between the sensor and PCM.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may not start or could roll unexpectedly if the park position is not detected. 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 cause and vehicle model.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.