P07B3
Transmission Park Position Sensor/Switch A Circuit Low
Transmission — park/position sensor
Generic OBD-II
Medium
What it means
P07B3 means the transmission park position sensor/switch A circuit is reading low — a short-to-ground or low-voltage fault. This sensor tells the control module whether the transmission is in Park. A bad reading can affect the gear indicator, the shift interlock, or starting on some vehicles. The engine usually still runs, but the incorrect signal should be corrected.
Medium
Can I keep driving? The car usually still drives, but a faulty park/neutral position signal can affect the shift interlock, gear display, or starting on some vehicles — get it checked.
Common symptoms
What you'll notice
- Check-engine light on
- Incorrect or missing Park/gear indication
- Shift interlock or starting issues on some vehicles
- Rough or unexpected shift behavior
Common causes
Most likely first
- Faulty or misadjusted park position sensor/switchLikely
- Short-to-ground or damaged wiring in the circuitCommon
- Corroded or loose sensor connectorCommon
- Poor groundLess often
- Failed transmission control module (TCM) — least commonLess often
How to diagnose & fix
Work through it in order
- Confirm the code and read freeze-frame data.
- Inspect the sensor connector and wiring for shorts, corrosion, or damage.
- Check and adjust the sensor or switch per the service procedure.
- Test the circuit voltage and replace the sensor if faulty.
- If wiring and sensor are good, diagnose the module. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P07B3?+
Usually driveable, but if it affects the shift interlock or starting on your vehicle, get it fixed promptly.
Can I just clear P07B3?+
It returns until the sensor or wiring fault is repaired.
Related codes
Often seen with P07B3
Read & clear P07B3 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX